Research Progress on the Moonlighting Functions of Carbohydrate-Metabolic Enzymes in Replication Programs, DNA Damage Repair, and Inflammatory Activation

The study of carbohydrate-metabolic enzymes has expanded beyond their classical catalytic roles to include higher-order cellular programs such as replication progression, DNA damage repair, and inflammatory activation. Multiple carbohydrate-metabolic enzymes can acquire moonlighting functions independent of substrate conversion through nuclear translocation, altered membrane localization, conformational switching, rewiring of protein-interaction networks, and changes in post-translational modifications. These functional transitions allow them to enter cell-cycle progression, DNA damage response, and pro-inflammatory transcriptional networks. Establishing a “mechanistic layer-functional layer-interpretive layer” framework around these functional rewiring events will facilitate a more accurate definition of the regulatory value of carbohydrate-metabolic enzymes in pathological states and help identify actionable intervention nodes.

Keywords: carbohydrate-metabolic enzymes; moonlighting functions; replication programs; DNA damage repair; inflammatory activation; PKM2; GAPDH; ENO1

1. Research Boundaries and Mechanistic Framework

1.1 Conceptual boundaries of moonlighting functions

(1) Functional independence

The moonlighting functions of carbohydrate-metabolic enzymes are not simply multiple catalytic consequences of the same enzyme within the same pathway. Rather, they represent independently identifiable regulatory tasks acquired beyond classical metabolic catalysis. For carbohydrate-metabolic enzymes, one category of function remains within core pathways such as glycolysis, the pentose phosphate pathway, or lactate production, where these enzymes mediate substrate conversion and energy supply. Another category of function extends into replication control, DNA damage repair, RNA fate determination, inflammatory signaling amplification, and microenvironmental remodeling. Therefore, the key issue in moonlighting-function research is not whether a given enzyme participates in metabolism, but when it ceases to be merely a “metabolic enzyme” and instead becomes a functional interface for higher-order cellular programs.

(2) Criteria for definition

The identification of moonlighting functions in carbohydrate-metabolic enzymes generally requires at least one of the following lines of evidence: redistribution of subcellular localization from the cytoplasm to the nucleus, the mitochondrial outer membrane, the cell surface, or specific stress-associated structures; formation of new functional interactions with transcription factors, DNA repair proteins, inflammatory complexes, or RNA-binding proteins; and phenotypes that can no longer be adequately explained by changes in carbohydrate-metabolic flux alone, but instead require a non-catalytic mechanism. Only within this interpretive framework do the roles of carbohydrate-metabolic enzymes in replication, repair, and inflammation acquire clear mechanistic significance.

1.2 Major bases of functional switching

(1) Redistribution of localization

Relocalization is the most common structural basis by which carbohydrate-metabolic enzymes acquire moonlighting functions. Once cytosolic glycolytic enzymes translocate into the nucleus, they can directly influence replication-related transcription, chromatin state, and DNA repair assembly. When localized to the mitochondrial outer membrane, they more readily participate in stress-threshold control and immunometabolic coupling. When positioned at the cell surface, they may contribute to migration, matrix degradation, and inflammatory propagation. Localization change is therefore not merely an accompanying phenomenon, but a prerequisite for functional switching.

(2) Conformational and modification-based switching

The moonlighting functions of some carbohydrate-metabolic enzymes are strongly conformation-dependent. PKM2 is a typical example: its tetrameric state is associated with high catalytic activity, whereas dimeric or monomeric states are more likely to enter the nuclear regulatory layer. In addition, post-translational modifications such as oxidation, phosphorylation, acetylation, lactylation, and nitrosylation can alter binding interfaces, localization tendencies, and signaling output, thereby shifting these enzymes from catalytic mode to structural or regulatory mode.

(3) Rewiring of interaction networks

Moonlighting functions of carbohydrate-metabolic enzymes fundamentally depend on the expansion of their interaction networks. These enzymes no longer interact only with substrates and cofactors, but instead form new complexes with DNA repair proteins, transcriptional co-regulators, pro-inflammatory signaling molecules, and RNA-binding factors. Such rewiring allows metabolic states to be directly projected onto replication, repair, and inflammatory programs.

2. Moonlighting Functions of Carbohydrate-Metabolic Enzymes in Replication Programs

2.1 The metabolic-transcriptional interface of replication progression

(1) The true demands of replication programs

Replication programs require not only more ATP and biosynthetic precursors, but also the conversion of metabolic state into sustained proliferative signaling. For this reason, simply observing increased glucose uptake or elevated lactate production is usually insufficient to explain a replication advantage. The more informative question is which carbohydrate-metabolic enzymes are redeployed into the nuclear regulatory layer, the replication-stress adaptation layer, or proliferation-associated transcriptional programs.

(2) Programmatic value of carbohydrate-metabolic enzymes

Once carbohydrate-metabolic enzymes enter the nucleus, their functions are no longer limited to supporting material synthesis, but extend to initiation of replication, cell-cycle progression, and proliferation-associated gene expression. For rapidly proliferating cells, this means that carbohydrate-metabolic enzymes serve not only as suppliers of metabolic resources, but also as state-maintenance factors for replication programs.

2.2 Replication-program functions of PKM2

(1) The proliferative transcriptional layer

PKM2 is one of the most representative moonlighting enzymes in replication programs. Its significance extends beyond catalysis at the terminal step of glycolysis, because changes in oligomeric state and nuclear localization allow it to enter proliferation-related transcriptional programs. In this context, PKM2 is no longer simply a terminal metabolic enzyme, but a transcriptional interface between metabolic state and cell-cycle progression.

(2) Coupling of biosynthetic support and signaling

After conformational switching, PKM2 can on the one hand promote the accumulation of upstream carbohydrate-metabolic intermediates, thereby enhancing the supply of nucleotide, amino acid, and lipid precursors; on the other hand, it can amplify replication-associated gene expression within the nucleus. The key to its moonlighting function is not merely increased pyruvate generation, but the coupling of biosynthetic advantage with transcriptional promotion.

2.3 Replication-adaptive functions of GAPDH and ENO1

(1) The nuclear regulatory role of GAPDH

In addition to its catalytic role in the middle phase of glycolysis, GAPDH can enter the nucleus and participate in transcriptional regulation, nuclear protein modification, and stress-response integration. In the context of replication, its importance lies not in simply increasing energy supply, but in converting redox state and carbohydrate-metabolic status into nuclear program signals.

(2) The growth-adaptive role of ENO1

The non-classical functions of ENO1 are manifested not only within the glycolytic core pathway, but also through cell-surface localization, migration-associated regulation, and growth-adaptation layers. In replication programs, ENO1 acts more like a structural and state-support factor, helping cells maintain membrane remodeling, cellular shape adjustment, and adaptation to the external microenvironment under conditions of rapid proliferation.

Table 1. Major modes by which carbohydrate-metabolic enzymes enter replication, repair, and inflammatory programs

Mode of entry	Major manifestation	Mechanistic significance
Nuclear translocation	Cytosolic enzymes enter the nucleus or chromatin-associated compartments	Establishes interfaces with replication and repair programs
Conformational switching	Conversion between tetrameric/dimeric or high-activity/low-activity states	Creates stratification between catalytic and regulatory functions
Post-translational modification	Oxidation, phosphorylation, acetylation, lactylation, etc.	Alters localization, interactions, and signaling output
Interaction-network rewiring	Formation of new links with transcription factors, repair proteins, and inflammatory complexes	Converts metabolic state into higher-order program output

3. Moonlighting Functions of Carbohydrate-Metabolic Enzymes in DNA Damage Repair

3.1 The repair-program interface of metabolic enzymes

(1) Structural requirements of repair programs

DNA damage repair is a process that depends strongly on timing, localization, and assembly of repair complexes. Accordingly, if carbohydrate-metabolic enzymes are to truly enter the repair layer, they must possess nuclear localization capacity or form defined interactions with repair proteins. For this reason, the moonlighting functions of carbohydrate-metabolic enzymes in repair cannot be simplified as “enhanced metabolism is beneficial for repair,” but should be understood as direct participation in repair-network organization.

(2) Distinguishing program-level action from background support

Repair studies should clearly distinguish between two categories of function: moonlighting functions that directly enter repair programs, and metabolic-support functions that alter the repair background through nucleotide supply, NADPH generation, and redox homeostasis. The former determines repair-pathway choice and assembly efficiency, whereas the latter determines whether the repair background is sustainable.

3.2 Repair functions of GAPDH

(1) The repair-complex interface layer

GAPDH is one of the most typical moonlighting enzymes in the field of DNA repair. It can interact with repair-associated proteins such as APE1 and PARP1, thereby participating in damage recognition, nuclear redox regulation, and coordination of repair responses. In this context, GAPDH has clearly moved beyond glycolytic background function and entered the organizational layer of repair complexes.

(2) The oxidative-state coupling layer

Through oxidation-state changes, nuclear accumulation, and related modifications, GAPDH can also alter repair-protein activity and repair thresholds. The key to its moonlighting function lies not in whether it promotes ATP generation, but in whether it directly couples oxidative stress status to repair programs.

3.3 Repair functions of PKM2

(1) The homologous-recombination regulatory layer

PKM2 has a clearly defined non-classical role in DNA double-strand break repair. After nuclear accumulation, it can enter the CtIP-associated regulatory layer and thereby influence homologous-recombination repair capacity. Here, PKM2 is no longer merely a metabolic output enzyme, but a functional regulator of high-fidelity repair pathways.

(2) The repair-tolerance layer

Because homologous-recombination capacity is directly related to cellular tolerance to replication stress, radiotherapy, and chemotherapy, the moonlighting function of PKM2 correspondingly becomes an interface linking genome stability and survival advantage. This layer holds substantial mechanistic value in studies of high proliferation and therapeutic resistance.

4. Moonlighting Functions of Carbohydrate-Metabolic Enzymes in Inflammatory Activation

4.1 Transformation of metabolic enzymes within inflammatory programs

(1) Inflammatory activation is not a simple extrapolation of enhanced glycolysis

Immune-cell activation is often accompanied by enhanced glycolysis, but the decisive change in inflammatory programs is not merely accelerated glucose consumption. Rather, it is the redeployment of certain carbohydrate-metabolic enzymes as inflammatory signal amplifiers, transcriptional co-factors, and threshold regulators of inflammasome activation. Therefore, in inflammation research, carbohydrate-metabolic enzymes should not be treated only as markers of elevated metabolism.

(2) The need for metabolic-inflammatory conversion

Inflammatory programs emphasize rapid response and amplified output, and thus depend particularly strongly on proteins capable of sensing both metabolic state and signaling state. Carbohydrate-metabolic enzymes possess this property: changes in conformation, nuclear translocation, or oxidation state can be directly converted into differences in inflammatory output.

4.2 Pro-inflammatory functions of PKM2

(1) The pro-inflammatory transcriptional layer

The most representative moonlighting function of PKM2 in inflammation is its participation, in low-oligomeric states, in HIF-1α-dependent pro-inflammatory transcriptional programs, thereby promoting the expression of inflammatory mediators such as IL-1β. In this context, the key role of PKM2 is not terminal energy supply, but serving as a metabolic-signaling converter for inflammatory transcription.

(2) The inflammatory amplification layer

Changes in PKM2 conformational state allow carbohydrate-metabolic status to be directly translated into differences in inflammatory output. This helps explain why, in certain inflammatory models, even when total ATP is not limiting, inflammatory amplification remains highly dependent on PKM2 state rather than on total carbohydrate-metabolic flux alone.

4.3 Inflammation-expanding functions of GAPDH, HK2, and ENO1

(1) GAPDH as a regulator of inflammatory thresholds

GAPDH can regulate the translational status of specific inflammatory cytokine mRNAs through RNA-binding behavior, and can also alter the cellular NAD+/NADH ratio and mitochondrial ROS state through oxidation, aggregation, and nuclear translocation, thereby influencing inflammasome activation thresholds. Its moonlighting function therefore enters both the post-transcriptional regulatory layer and the inflammatory amplification layer.

(2) Structural functions of HK2 and ENO1

Because HK2 is associated with the mitochondrial outer membrane, it is more readily positioned within the immunometabolic interface and the inflammatory-threshold control layer. ENO1, by contrast, can act at the cell surface in a plasminogen receptor-like capacity, participating in inflammatory-cell migration, matrix degradation, and local inflammatory expansion. Both functions clearly depart from the classical definition of core glycolytic activity.

Table 2. Representative carbohydrate-metabolic enzymes in replication, repair, and inflammatory activation

Carbohydrate-metabolic enzyme	Replication programs	DNA damage repair	Inflammatory activation
PKM2	Participates in proliferation-related transcription and replication progression	Regulates CtIP-associated homologous recombination repair	Couples with HIF-1α and amplifies IL-1β expression
GAPDH	Participates in nuclear regulation and replication adaptation	Interacts with repair proteins and regulates repair thresholds	Regulates inflammatory-cytokine translation and inflammasome activation
ENO1	Supports growth and structural adaptation	Mainly influences adaptation under high replication stress	Participates in cell-surface receptor-like functions and inflammatory migration
HK2	Establishes a high-glucose-utilization state preparatory for replication	Mainly affects repair-background tolerance	Links mitochondrial status to inflammatory activation thresholds

5. Research Design and Interpretive Principles

5.1 Functional attribution

(1) Separation of catalytic and moonlighting functions

The most common interpretive error in this field is to attribute any decline in phenotype after targeting a given carbohydrate-metabolic enzyme directly to loss of its moonlighting function. A more rigorous strategy is to combine catalytic inhibition, localization interference, interaction blockade, and rescue with catalytically inactive mutants, thereby distinguishing between “loss of metabolic function” and “loss of moonlighting function.”

(2) Distinguishing total expression from functional switching

An increase in total expression of a carbohydrate-metabolic enzyme does not automatically indicate an increase in moonlighting activity. The more informative evidence consists of nuclear translocation, conformational switching, formation of new interactions, and changes in post-translational modifications. Experimental design should therefore not remain limited to mRNA and total-protein detection.

5.2 Model selection

(1) Replication models

If the goal is to study replication programs, rapidly proliferating or high-replication-stress cell models should be prioritized, together with simultaneous assessment of cell-cycle status, DNA replication markers, and nuclear localization of carbohydrate-metabolic enzymes. Otherwise, it is difficult to determine whether the observed effect reflects general metabolic support or replication-program regulation.

(2) Repair models

If the goal is to study DNA damage repair, the damage type must be clearly defined, and single-strand lesions, double-strand breaks, and replication-fork stress must be distinguished. Only under clearly defined damage models do repair-related moonlighting functions of carbohydrate-metabolic enzymes become mechanistically interpretable.

(3) Inflammatory models

If the goal is to study inflammatory activation, it is necessary to distinguish among pro-inflammatory polarization, inflammasome activation, and maintenance of chronic inflammation. Under these different backgrounds, PKM2, GAPDH, HK2, and ENO1 do not enter exactly the same functional layers.

5.3 Key readouts

① At the localization layer, redistribution among the cytoplasm, nucleus, mitochondrial outer membrane, and cell surface should be measured, rather than substituting total protein changes for functional judgment.

② At the modification layer, particular attention should be paid to PKM2 conformational state, GAPDH oxidative state, and key changes in phosphorylation, acetylation, lactylation, and related modifications, because these are often direct determinants of switching into moonlighting functions.

③ At the interaction layer, new interactions between carbohydrate-metabolic enzymes and transcription factors, DNA repair proteins, RNA-binding proteins, and inflammatory complexes should be analyzed. These represent key evidence that the enzymes have entered higher-order programs.

④ At the functional layer, outcomes such as replication efficiency, homologous-recombination repair capacity, inflammatory-cytokine release, and inflammasome activation should be interpreted separately from changes in catalytic activity, in order to avoid misclassifying general metabolic effects as moonlighting functions.

5.4 Application-oriented interpretation

(1) Replication direction

If intervention against a particular carbohydrate-metabolic enzyme primarily alters S-phase entry, replication-fork stability, and proliferation-related transcription, while having limited influence on baseline ATP, this more strongly supports a replication-related moonlighting function.

(2) Repair direction

If intervention mainly changes the kinetics of γH2AX clearance, RAD51 assembly, homologous-recombination efficiency, or post-damage survival thresholds, this more strongly supports entry into DNA repair programs.

(3) Inflammation direction

If intervention mainly alters IL-1β, TNF-α, HIF-1α-dependent transcription, or inflammasome activation, rather than simply changing glucose consumption, this more strongly supports an inflammation-related moonlighting function.

6. Related Research Products

Table 3. Product table related to the study of moonlighting functions of carbohydrate-metabolic enzymes

Name	CAS No.	Experimental stage	Key use	Use notes
2-Deoxy-D-glucose	154-17-6	Glycolytic intervention layer	Inhibits effective entry of glucose into glycolysis and is used to distinguish dependence on basal metabolism from dependence on moonlighting functions	Suitable as a metabolic-background inhibition control, but should not be directly equated with inhibition of moonlighting functions of a single enzyme
3-Bromopyruvic acid	1113-59-3	HK2-related layer	Commonly used to interfere with hexokinase-related metabolic activity and to analyze the dependence of replication, inflammatory, and repair phenotypes on the glycolytic entry step	Strongly acting; attention should be paid to cytotoxicity and secondary mitochondrial effects
Lonidamine	50264-69-2	HK2/mitochondrial-interface layer	Interferes with hexokinase-mitochondria metabolic coupling and is suitable for studying localization-related functions of HK2	Suitable for combined analysis with mitochondrial membrane potential and inflammatory readouts
Sodium iodoacetate	305-53-3	GAPDH layer	Interferes with GAPDH-related reactions and is used to analyze stratification between its catalytic and nuclear/inflammation-related functions	Interpretation should be combined with localization and interaction experiments; activity reduction alone is insufficient
TEPP-46	1221186-53-3	PKM2 conformational layer	Promotes stabilization of PKM2 tetramers and is used to suppress nuclear moonlighting functions while analyzing pro-inflammatory and replication-related phenotypes	Suitable for PKM2-HIF-1α, replication progression, and repair-tolerance studies
Shikonin	517-89-5	PKM2 functional layer	Commonly used to interfere with PKM2-related functions and suitable for studying PKM2 dependence in replication programs and inflammatory activation	Possible multi-target effects should be considered
Dehydroepiandrosterone	53-43-0	G6PD layer	Interferes with G6PD-related processes and is used to analyze the relationship between NADPH supply and repair or inflammatory tolerance	More suitable for studies of repair background and redox homeostasis
6-Aminonicotinamide	329-89-5	Pentose phosphate pathway layer	Inhibits pentose-related metabolic processes and is used to analyze the relationship between nucleotide supply and adaptation to DNA repair and replication stress	Suitable for nucleic-acid synthesis and repair models
Oxamate	471-46-5	LDHA layer	Interferes with lactate dehydrogenase-related processes and is used to analyze the support provided by the lactate axis for inflammatory activation and replication adaptation	Suitable for combined analysis with NAD+/NADH and lactate readouts
Sodium dichloroacetate	2156-56-1	Pyruvate branching layer	Redirects pyruvate metabolism and is used to analyze the impact of shifting from high glycolysis toward oxidative metabolism on moonlighting-function output	Suitable for metabolic-state reversal experiments
Sodium pyruvate	113-24-6	Downstream carbon-flux rescue layer	Used to rescue terminal glycolytic products and distinguish upstream enzyme functions from downstream carbon-flux deficiency	Suitable for metabolic rescue designs
Sodium lactate	72-17-3	Lactate signaling layer	Establishes a high-lactate environment and is used to analyze the role of lactate in inflammatory amplification and cell-state remodeling	Suitable as a control paired with LDHA intervention
Nicotinamide adenine dinucleotide	53-84-9	Cofactor-state layer	Used in NAD+/NADH-related systems to analyze the redox background associated with GAPDH and inflammasomes	More suitable for in vitro enzymatic and cofactor-dependent experiments
Reduced nicotinamide adenine dinucleotide phosphate tetrasodium salt	2646-71-1	NADPH supply layer	Used to analyze the effect of NADPH changes on repair capacity and oxidative-stress buffering	Suitable for use with G6PD models
Sodium nicotinamide adenine dinucleotide phosphate	24292-60-2	NADP(H) state layer	Used in in vitro enzymatic systems and NADP(H)-balance analysis	Suitable for pentose-phosphate-pathway-related studies
N-Acetyl-L-cysteine	616-91-1	Redox-buffering layer	Used to buffer oxidative stress and analyze the relationship between GAPDH oxidative state and inflammatory or repair phenotypes	More suitable for distinguishing oxidative-stress effects from structural moonlighting-function effects
Ascorbic acid	50-81-7	Redox-buffering layer	Modulates the redox environment and assists analysis of oxidation-sensitive moonlighting functions in repair and inflammatory models	Suitable for combined use with ROS readouts
Reduced glutathione	70-18-8	Reductive-buffering layer	Used to evaluate coupling between NADPH-dependent reductive-buffering capacity and moonlighting-function output	Suitable for studies of repair tolerance and inflammatory thresholds

Table 4. Product table related to the study of moonlighting functions of carbohydrate-metabolic enzymes in replication, repair, and inflammatory activation

Catalog No.	Name	Grade and purity	Corresponding research stage	Suitable research direction/application
P774071	Pyruvate Kinase (PK)	Biologically active, recombinant, ActiBioPure™, high performance, EnzymoPure™, ≥90%(SDS-PAGE), ≥50 U/mg enzyme powder; ≥300 U/mg protein	PK/PKM2-related functional layer	Suitable for constructing in vitro pyruvate-kinase systems and analyzing coupling between terminal glycolytic enzymes and replication progression or metabolic-signaling integration
A1501205	Pyruvate Kinase (PK) Activity Assay Kit (UV Micro Method)	BioReagent	PK activity-detection layer	Suitable for detecting changes in PK activity and evaluating alterations in terminal glycolytic flux under replication-program and inflammatory-activation conditions
P1501308	Hexokinase (HK) Activity Assay Kit (UV Micro Method)	BioReagent	PK activity-detection layer	Suitable for routine quantitative detection of PK activity as a basic enzymatic readout after PK/PKM2 functional interventions
Ab122149	PKM2 Antibody	Carrier free, ExactAb™, azide free, validated, high performance, knockdown validated, see COA	PKM2 detection layer	Suitable for PKM2 expression and localization studies, particularly for analysis of PKM2 status in replication progression, repair tolerance, and inflammatory activation
P427013	PKM2 inhibitor(compound 3k)	10 mM in DMSO	PKM2 intervention layer	Suitable for functional-intervention experiments analyzing PKM2 dependence in replication progression, repair tolerance, and inflammatory amplification
Ab327286	Recombinant PKM2 Antibody	Knockdown validated	PKM2 specificity-validation layer	Suitable for specificity validation in PKM2 knockdown models
Ab326215	GAPDH Antibody	Knockdown validated	GAPDH detection layer	Suitable for validation after GAPDH expression or functional intervention, helping assess its involvement in moonlighting functions in replication, repair, or inflammation
Ab179920	GAPDH Mouse mAb	Carrier free, ExactAb™, azide free, validated, high performance, see COA	GAPDH detection layer	Suitable for Western blotting, immunofluorescence, and subcellular localization analysis to evaluate GAPDH nuclear translocation and functional switching
Ab155825	GAPDH Mouse mAb	Carrier free, ExactAb™, azide free, validated, high performance, 1.0 mg/mL	GAPDH detection layer	Suitable for routine expression detection and localization analysis, supporting studies of GAPDH function in replication and repair models
Ab327442	GAPDH Mouse mAb	Knockout validated	GAPDH specificity-validation layer	Suitable for specificity validation in GAPDH knockout models, reducing nonspecific antibody interference in moonlighting-function studies
Ab327073	GAPDH Mouse mAb	Knockdown validated	GAPDH specificity-validation layer	Suitable for post-knockdown validation and for distinguishing GAPDH downregulation from functional-switching effects
Ab219254	GAPDH Mouse mAb (AF405)	ExactAb™, validated, 0.5 mg/mL	GAPDH fluorescence-localization layer	Suitable for immunofluorescence and co-localization studies to observe redistribution of GAPDH in the nucleus, cytoplasm, or inflammation-related structures
Ab219255	GAPDH Mouse mAb (AF488)	ExactAb™, validated, 0.5 mg/mL	GAPDH fluorescence-localization layer	Suitable for cellular imaging and analysis of GAPDH localization changes during replication or repair responses
Ab219257	GAPDH Mouse mAb (AF555)	ExactAb™, validated, 0.5 mg/mL	GAPDH fluorescence-localization layer	Suitable for multiplex staining to study co-localization of GAPDH with DNA-repair or inflammatory markers
Ab219259	GAPDH Mouse mAb (AF647)	ExactAb™, validated, 0.5 mg/mL	GAPDH fluorescence-localization layer	Suitable for high-throughput imaging and flow-related detection to assess GAPDH state transitions
Ab219262	GAPDH Mouse mAb (AF700)	ExactAb™, validated, 0.5 mg/mL	GAPDH fluorescence-localization layer	Suitable for GAPDH detection in multicolor systems
Ab219263	GAPDH Mouse mAb (AF750)	ExactAb™, validated, 0.5 mg/mL	GAPDH fluorescence-localization layer	Suitable for expanded multiplex imaging experiments and analysis of GAPDH spatial distribution in complex models
Ab219252	GAPDH Mouse mAb (Biotin)	ExactAb™, validated, 0.5 mg/mL	GAPDH capture-detection layer	Suitable for immunoprecipitation, pull-down, or amplified detection systems to analyze GAPDH interaction networks
Ab219253	GAPDH Mouse mAb (FITC)	ExactAb™, validated, 0.5 mg/mL	GAPDH imaging layer	Suitable for intracellular localization and co-expression analysis
Ab219251	GAPDH Mouse mAb (HRP)	ExactAb™, validated, 0.5 mg/mL	GAPDH routine-detection layer	Suitable for routine expression detection such as Western blotting
Ab104781	Recombinant GAPDH Antibody	ExactAb™, validated, recombinant, high performance, see COA	GAPDH detection layer	Suitable for highly reproducible expression and localization analysis, supporting standardized validation in moonlighting-function studies
Ab327443	Recombinant GAPDH Antibody	Knockout validated	GAPDH specificity-validation layer	Suitable for knockout-model validation to strengthen reliability of GAPDH-related findings
Ab104788	Recombinant GAPDH Antibody	ExactAb™, validated, recombinant, high performance, 0.5 mg/mL	GAPDH detection layer	Suitable for expression, localization, and interaction-validation experiments
Ab325640	Recombinant GAPDH Antibody	Knockdown validated	GAPDH specificity-validation layer	Suitable for specificity controls in knockdown models
rp156145	Recombinant Human GAPDH Protein	Carrier free, azide free, His tag, ≥95%(SDS-PAGE)	GAPDH recombinant-protein layer	Suitable for in vitro reconstruction of GAPDH-related interactions, enzymatic activity, and RNA/protein-binding experiments to study its non-classical roles in replication, repair, and inflammation
Ab183888	ENO1 Mouse mAb	Animal-free, carrier free, ExactAb™, azide free, validated, high performance, ≥95%(SDS-PAGE), 1.0 mg/mL	ENO1 detection layer	Suitable for ENO1 expression and localization analysis, evaluating its moonlighting functions in proliferation and inflammatory migration
Ab101688	ENO1 Mouse mAb	Carrier free, ExactAb™, azide free, validated, high performance, see COA	ENO1 detection layer	Suitable for routine detection and immunolocalization
rp176721	Recombinant Human ENO1 Protein	Carrier free, His tag, ≥90%(SDS-PAGE)	ENO1 recombinant-protein layer	Suitable for in vitro functional validation, protein-interaction, and structural studies of ENO1 non-classical roles
EJ1513679	Human Enolase 1 (ENO1) ELISA Kit	BioReagent	ENO1 quantification layer	Suitable for quantifying ENO1 levels in samples and assisting analysis of ENO1 expression changes in inflammatory or proliferation models
EJ1514795	Human Glucose-6-phosphate Dehydrogenase (G6PD) ELISA Kit	BioReagent	G6PD quantification layer	Suitable for detecting G6PD level changes and evaluating the relationship between the pentose phosphate pathway and repair or inflammatory tolerance
EJ1513176	Mouse Glucose 6 Phosphate Dehydrogenase (G6PD) ELISA Kit	BioReagent	G6PD quantification layer	Suitable for measuring G6PD expression changes in mouse models
G774878	Glucose-6-Phosphate Dehydrogenase (G6PD)	ActiBioPure™, biologically active, high performance, EnzymoPure™, ≥95%(SDS-PAGE), ≥600 U/mg protein	G6PD enzymatic layer	Suitable for constructing in vitro G6PD systems and analyzing coupling between NADPH supply and repair or inflammatory background
G1506775	Glucose-6-Phosphate Dehydrogenase (G6PDH) Activity Assay Kit (UV Micro Method)	BioReagent	G6PD activity layer	Suitable for detecting pentose-phosphate-pathway entry activity and evaluating changes in NADPH-generation capacity
G1515935	Glucose-6-Phosphate Dehydrogenase (G6PDH) Activity Assay Kit (UV Colorimetric Method)	BioReagent	G6PD activity layer	Suitable for routine quantitative analysis of G6PD activity
rp183741	Recombinant Human Lactate Dehydrogenase A/LDHA Protein	Carrier free, biologically active, ActiBioPure™, His tag, ≥95%(SDS-PAGE), see COA	LDHA recombinant-protein layer	Suitable for in vitro enzymatic and interaction studies to analyze the supportive role of LDHA in inflammatory states and replication adaptation
EJ1511966	Rat Lactate Dehydrogenase A (LDHA) ELISA Kit	BioReagent	LDHA quantification layer	Suitable for detecting LDHA levels in rat models
EJ1512629	Mouse Lactate Dehydrogenase A (LDH-A) ELISA Kit	BioReagent	LDHA quantification layer	Suitable for evaluation of LDHA expression changes in mouse models
A288801	AZ PFKFB3 26	≥98%(HPLC)	PFKFB3 intervention layer	Suitable for interfering with the glycolytic-promotion layer and analyzing regulation of replication and inflammatory metabolic states by PFKFB3
A287807	AZ PFKFB3 67	≥98%(HPLC)	PFKFB3 intervention layer	Suitable for parallel validation of PFKFB3 dependence and improved robustness
rp188263	Recombinant Human PFKFB3 Protein	Carrier free, biologically active, ActiBioPure™, His tag, ≥95%(SDS-PAGE), see COA	PFKFB3 recombinant-protein layer	Suitable for in vitro reconstruction of PFKFB3-related functional systems and analysis of coupling between glycolytic progression and higher-order programs
Ab326784	Recombinant PFKFB3 Antibody	Knockdown validated	PFKFB3 specificity-validation layer	Suitable for specificity validation in PFKFB3 knockdown models
Ab121416	Recombinant PFKFB3 Antibody	Recombinant, ExactAb™, validated, high performance, see COA	PFKFB3 detection layer	Suitable for detecting changes in PFKFB3 expression and localization
N124910	N3PT	≥98%	TKT intervention layer	Suitable for analyzing the role of the non-oxidative pentose phosphate pathway in replication and repair tolerance
EJ1515013	Human Transketolase (TKT) ELISA Kit	BioReagent	TKT quantification layer	Suitable for detecting TKT level changes in human samples
EJ1515014	Human Transketolase Like Protein 1 (TKTL1) ELISA Kit	BioReagent	TKT/TKTL1-related layer	Suitable for analyzing expression changes of TKT-like proteins in high-proliferation and inflammatory contexts
EJ1512368	Rat Transketolase (TKT) ELISA Kit	BioReagent	TKT quantification layer	Suitable for evaluating TKT changes in rat models
P1505406	3-Phosphoglycerate Kinase (PGK) Activity Assay Kit (UV Micro Method)	BioReagent	PGK activity layer	Suitable for analyzing activity changes in the middle-to-late stage of glycolysis as background metabolic readouts in replication and inflammatory models
P1505407	3-Phosphoglycerate Kinase (PGK) Activity Assay Kit (UV Colorimetric Method)	BioReagent	PGK activity layer	Suitable for routine detection of PGK activity changes
EJ1512969	Mouse Phosphoglycerate Kinase(PGK) ELISA Kit	BioReagent	PGK quantification layer	Suitable for detecting PGK expression in mouse models
EJ1514456	Human Phosphoglycerate Kinase 1 (PGK1) ELISA Kit	BioReagent	PGK1 quantification layer	Suitable for detecting PGK1 levels in human samples and evaluating its expression association with replication adaptation, repair background, and inflammatory states
P1441020	Phosphoglycerate kinase, yeast	—	PGK enzymatic layer	Suitable for in vitro enzymatic systems or methodological validation to analyze changes in PGK within metabolic backgrounds

The real value of research on the moonlighting functions of carbohydrate-metabolic enzymes lies in directly linking metabolic state to three major classes of cellular programs: replication progression, DNA repair, and inflammatory amplification. Studies with stronger explanatory power in this field should focus on defining the triggering conditions, structural basis, and stratifiable intervention nodes of functional switching, rather than remaining at the level of metabolic enhancement phenomena alone.

For more related articles, please see below:

[1] Twelve Key Enzymes in Glucose Metabolism