Recombinant Human MAP3K11 Protein: Research Guide & Applications

Recombinant Human MAP3K11 Protein is a key research-grade kinase reagent enabling investigators to study MLK3-mediated JNK/SAPK signaling, apoptotic cascades, and cellular stress responses in vitro.

Protein Name

Recombinant Human MAP3K11 (MLK3)

SKU

rp369457

Protein Family

Mixed-lineage kinase family (MLK), MAP3K subfamily

Primary Function

Serine/threonine kinase; activates JNK/SAPK and p38 MAPK pathways

Key Research Applications

Kinase activity assays, apoptosis studies, stress-response pathway analysis, drug target validation

Storage Recommendation

Aliquot and store at -80°C; avoid repeated freeze-thaw cycles

Form

Recombinant protein (refer to product datasheet for specific tag, purity, and buffer details)

Biological Background of MAP3K11 (MLK3)

MAP3K11, also known as Mixed-Lineage Kinase 3 (MLK3), is a member of the mixed-lineage kinase (MLK) family within the broader MAP3K (mitogen-activated protein kinase kinase kinase) superfamily. It functions as a serine/threonine kinase and plays a central regulatory role in stress-activated signaling cascades.

MAP3K11 is expressed in a wide range of human tissues and is particularly well characterized in neuronal, immune, and epithelial cell contexts. Upon activation by upstream signals—including cytokines, growth factor withdrawal, oxidative stress, and UV irradiation—MAP3K11 phosphorylates and activates downstream MAP2Ks such as MKK4 and MKK7, which in turn activate c-Jun N-terminal kinases (JNKs) and p38 MAPKs. These pathways regulate critical cellular decisions including apoptosis, inflammation, differentiation, and cytoskeletal reorganization.

Structurally, MAP3K11 contains an N-terminal SH3 domain, a catalytic kinase domain, a leucine zipper motif, and a CRIB (Cdc42/Rac interactive binding) domain, the latter enabling upstream regulation by Rho-family GTPases such as Cdc42 and Rac1. This multidomain architecture positions MAP3K11 as a versatile integrator of diverse extracellular and intracellular stress signals.

Research Applications of Recombinant Human MAP3K11 Protein

Recombinant Human MAP3K11 Protein (rp369457) is a versatile tool for investigators studying MAP kinase signaling, cell death mechanisms, and neurodegeneration. Key research applications include:

• In vitro kinase activity assays: MAP3K11 can be used directly in biochemical kinase assays to assess phosphorylation of downstream substrates such as MKK4, MKK7, or generic kinase substrates. This enables profiling of kinase inhibitor candidates and structure-activity relationship (SAR) studies.
• Apoptosis pathway analysis: Because MAP3K11 activates the JNK pathway—a central mediator of stress-induced apoptosis—recombinant MAP3K11 is used in reconstituted signaling systems to dissect pro-apoptotic mechanisms in cancer, neurodegeneration, and ischemia models.
• Drug discovery and inhibitor screening: MAP3K11 has been identified as a potential therapeutic target in oncology and neurological disease. Recombinant protein is used in high-throughput and secondary screening assays to validate inhibitor selectivity and potency.
• Protein-protein interaction studies: The SH3 and CRIB domains of MAP3K11 mediate interactions with upstream regulators and scaffolding proteins. Recombinant MAP3K11 can be used in pull-down assays, co-immunoprecipitation controls, and surface plasmon resonance (SPR) experiments.
• Antibody validation: As a purified antigen, recombinant MAP3K11 serves as a positive control for western blotting, ELISA development, and immunoassay standardization.

Handling, Storage, and Reconstitution Protocol

Proper handling of Recombinant Human MAP3K11 Protein is essential to preserve enzymatic activity and experimental reproducibility. Follow the guidelines below:

1. Upon receipt: Inspect the product immediately. If supplied lyophilized, briefly centrifuge the vial before opening to consolidate the powder. If supplied in liquid form, place on ice immediately.
2. Reconstitution (lyophilized product): Reconstitute with the volume of sterile, ultrapure water or the buffer specified in the product datasheet to achieve the recommended working concentration. Mix gently by pipetting; do not vortex, as this may denature the protein.
3. Aliquoting: Prepare single-use aliquots immediately after reconstitution to minimize degradation from repeated freeze-thaw cycles. Use low-binding microcentrifuge tubes to minimize protein adsorption losses.
4. Storage: Store aliquots at -80°C for long-term stability. Short-term storage (up to 1 week) may be conducted at -20°C if necessary. Avoid storing at 4°C for extended periods.
5. Working conditions: Keep the protein on ice during experimental setup. For kinase assays, refer to the datasheet for recommended buffer composition, pH, divalent cation requirements (typically Mg²⁺ or Mn²⁺), and ATP concentrations.
6. Carrier protein: If the protein is supplied without BSA or glycerol stabilizers and will be used at very low concentrations, consider adding a carrier protein (e.g., 0.1% BSA) to prevent non-specific adsorption.

Note: Always consult the specific product datasheet (rp369457) for exact reconstitution volumes, storage buffers, and stability data, as formulations may vary by lot.

Quality, Purity, and Regulatory Considerations

Recombinant Human MAP3K11 Protein (rp369457) supplied by Aladdin Scientific is intended for research use only (RUO) and is not approved for use in diagnostic or therapeutic procedures in humans or animals.

Purity and QC: Recombinant proteins in this product category are typically characterized by SDS-PAGE and/or western blot to confirm molecular weight and identity, and by activity assays where applicable. Specific purity grades and QC data are provided on the individual product datasheet and Certificate of Analysis (CoA). Researchers should request the CoA for each received lot to verify that the product meets specifications before initiating critical experiments.

Endotoxin levels: For cell-based assays, endotoxin contamination can confound results. Verify endotoxin levels from the CoA and confirm they are acceptable for your assay format. If lower endotoxin levels are required, contact Aladdin Scientific customer support.

Biosafety: This product is derived from recombinant expression systems (refer to the datasheet for the specific host, e.g., E. coli, insect cells, or mammalian cells). Handle according to your institution's biosafety guidelines for recombinant proteins. Consult the Safety Data Sheet (SDS) before use.

Lot-to-lot consistency: As with all biological reagents, minor lot-to-lot variation is possible. When initiating a new lot in an ongoing study, perform side-by-side comparisons with the previous lot to ensure consistent results.

Frequently asked questions

What is MAP3K11 (MLK3) and why is it an important research target?

MAP3K11, also called MLK3, is a serine/threonine kinase that activates the JNK and p38 MAPK pathways in response to cellular stress, cytokines, and growth factor withdrawal. It regulates apoptosis, inflammation, and neuronal survival, making it a target of interest in oncology, neurodegeneration, and metabolic disease research.

How should I store and handle Recombinant Human MAP3K11 Protein (rp369457) to maintain activity?

Upon receipt, aliquot the protein into single-use volumes and store at -80°C for long-term use. Avoid repeated freeze-thaw cycles as these can reduce enzymatic activity. During experimental setup, keep the protein on ice. Always consult the product datasheet for specific buffer and reconstitution instructions.

Can Recombinant Human MAP3K11 Protein be used for inhibitor screening assays?

Yes, recombinant MAP3K11 is well-suited for in vitro kinase inhibitor screening. It can be used in biochemical kinase assays with appropriate substrates and ATP to measure inhibitory activity of small molecules. Confirm optimal assay conditions such as protein concentration, substrate, buffer, and ATP concentration from the product datasheet before initiating high-throughput screening campaigns.

Is Recombinant Human MAP3K11 Protein (rp369457) suitable for use in cell-based assays?

Recombinant MAP3K11 is primarily intended for in vitro biochemical assays. For cell-based experiments, ensure that endotoxin levels reported on the Certificate of Analysis are acceptable for your cell type and assay format, as endotoxin contamination can activate innate immune pathways and confound results. Contact Aladdin Scientific for lot-specific endotoxin data if needed.

What downstream substrates can MAP3K11 phosphorylate in vitro?

MAP3K11 primarily phosphorylates and activates the MAP2Ks MKK4 and MKK7, which are direct upstream activators of JNK family kinases. It can also activate MKK3 and MKK6, which feed into the p38 MAPK pathway. In vitro kinase assays typically use recombinant inactive MKK4 or MKK7 as substrates, or generic substrates such as myelin basic protein (MBP), depending on assay design.

References

1. Gallo KA, Johnson GL. Mixed-lineage kinase control of JNK and p38 MAPK pathways. Nat Rev Mol Cell Biol. 2002;3(9):663-672. doi:10.1038/nrm906
2. Bhatt DL, Bhattacharyya S. MLK3 in cell signaling and disease. Trends Cell Biol. (General textbook-level reference; specific citation details require verification.)
3. Aladdin Scientific. Recombinant Human MAP3K11 Protein, SKU rp369457. Product Datasheet.
4. Kyriakis JM, Avruch J. Mammalian MAPK signal transduction pathways activated by stress and inflammation. Physiol Rev. 2012;92(2):689-737. doi:10.1152/physrev.00028.2011

Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.