Recombinant Human GLMN Protein: Research Guide & Protocol

Recombinant Human GLMN Protein is a research-grade recombinant protein derived from the human GLMN gene, supporting studies in vascular morphogenesis, ubiquitin-mediated signaling, and glomuvenous malformation pathways.

Product Name

Recombinant Human GLMN Protein

SKU

rp375977

Gene Name

GLMN (Glomulin)

Species

Human (Homo sapiens)

Application

Biochemical assays, binding studies, functional research in vascular biology and ubiquitin ligase pathways

Storage Recommendation

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

Protein Background and Biological Function

GLMN, commonly known as Glomulin, is a protein encoded by the GLMN gene in humans. It is recognized as a component of the Cullin-RING ubiquitin ligase (CRL) complex, where it acts by binding to RBX1 (also called ROC1) and inhibiting the autoubiquitination activity of CRL complexes. This regulatory role places GLMN at the intersection of ubiquitin-proteasome pathway control and vascular biology.

Mutations in the GLMN gene are associated with glomuvenous malformations (GVMs), a hereditary vascular disorder characterized by abnormal clusters of smooth muscle-like glomus cells surrounding venous channels. Understanding GLMN protein interactions is therefore of significant interest for researchers studying vascular development, rare vascular diseases, and protein ubiquitination mechanisms.

Reconstitution and Handling Protocol

Follow the steps below to ensure optimal activity and integrity of Recombinant Human GLMN Protein (rp375977):

1. Reconstitution: Briefly centrifuge the vial before opening to collect lyophilized material at the bottom. Reconstitute the protein in sterile, ultrapure water or the buffer recommended on the product datasheet to achieve the desired working concentration. Gently mix by pipetting; do not vortex.
2. Equilibration: Allow the vial to equilibrate to room temperature for a few minutes before reconstitution if the protein was stored frozen. This minimizes condensation and potential aggregation.
3. Carrier Protein: For long-term stability and to prevent non-specific adsorption to tube surfaces, consider adding bovine serum albumin (BSA) to a final concentration of 0.1–0.5% in the reconstituted stock.
4. Aliquoting: Prepare single-use aliquots immediately after reconstitution to avoid repeated freeze-thaw cycles, which can degrade protein activity and integrity.
5. Working Concentration: Determine the optimal concentration empirically for each specific assay. Refer to published literature on GLMN functional assays as a starting guide.

Note: Specific buffer composition, concentration, and reconstitution volume should be confirmed on the official product datasheet for rp375977.

Storage, Stability, and Quality Control

Storage Conditions: Recombinant Human GLMN Protein should be stored at -80°C upon receipt for long-term preservation. For short-term use (up to 1 week), storage at 4°C may be acceptable, but extended storage at this temperature is not recommended as it may compromise protein stability.

Freeze-Thaw Cycles: Repeated freeze-thaw cycles should be strictly avoided. Each cycle can lead to protein aggregation, loss of biological activity, and reduced assay reproducibility. Always aliquot into volumes appropriate for single experimental use.

Quality Control: Research-grade recombinant proteins from Aladdin Scientific undergo standard QC procedures, which typically include SDS-PAGE analysis to confirm molecular weight and purity, and may include functional or binding verification. Researchers should confirm the specific QC data available for rp375977 by consulting the official product datasheet or contacting Aladdin Scientific technical support.

Expiry and Lot Traceability: Check the certificate of analysis (CoA) for lot-specific purity, concentration, and expiry information before use.

Recommended Applications

Recombinant Human GLMN Protein (rp375977) is suitable for a range of in vitro research applications, including but not limited to:

• Protein–Protein Interaction Studies: Investigating GLMN binding to components of the CRL complex, such as RBX1/ROC1, using techniques like co-immunoprecipitation, pull-down assays, or surface plasmon resonance (SPR).
• Ubiquitination Pathway Research: Functional reconstitution assays to study GLMN-mediated inhibition of CRL autoubiquitination activity.
• Biochemical Characterization: Structural and biophysical studies including native PAGE, size-exclusion chromatography, or analytical ultracentrifugation.
• Drug Discovery and Screening: Use as a target protein in small-molecule or peptide inhibitor screening campaigns related to GVM or ubiquitin ligase biology.
• Antibody Validation: As a positive control antigen for validating anti-GLMN antibodies in Western blot, ELISA, or immunoprecipitation experiments.

Researchers should validate the protein in their specific experimental system before use in critical assays.

Troubleshooting Common Issues

The following guidance addresses common challenges encountered when working with Recombinant Human GLMN Protein:

Issue	Possible Cause	Recommended Action
Protein aggregation or precipitation	Repeated freeze-thaw cycles; improper reconstitution	Aliquot into single-use volumes; reconstitute gently without vortexing; add BSA as carrier
Low or no detected activity	Protein degradation; incorrect buffer conditions	Check storage history; verify buffer composition and pH; use fresh aliquots
Non-specific bands on SDS-PAGE	Protein degradation or contaminants	Confirm lot CoA; contact Aladdin Scientific technical support
Inconsistent assay results	Variable working concentrations; pipetting errors	Prepare fresh dilutions from stock; include internal controls in each assay

For persistent issues, contact Aladdin Scientific technical support with your lot number, storage conditions, and a description of the assay system used.

Frequently asked questions

What is the recommended reconstitution buffer for Recombinant Human GLMN Protein (rp375977)?

The specific reconstitution buffer and volume are detailed on the official product datasheet for rp375977. In general, sterile ultrapure water or a physiologically compatible buffer such as PBS (pH 7.4) is commonly used for recombinant proteins. Always refer to the product-specific datasheet for confirmed guidance.

How many freeze-thaw cycles can Recombinant Human GLMN Protein tolerate?

As a general best practice for recombinant proteins, repeated freeze-thaw cycles should be minimized—ideally limited to no more than 2–3 cycles—to preserve protein activity and structural integrity. We strongly recommend aliquoting the protein into single-use volumes upon receipt or after reconstitution to avoid this issue entirely.

What applications is Recombinant Human GLMN Protein validated for?

Recombinant Human GLMN Protein (rp375977) is intended for research applications including protein–protein interaction studies, ubiquitination pathway assays, biochemical characterization, antibody validation, and drug discovery screening. Researchers should confirm validated applications on the product datasheet and perform their own system-specific validation before critical experiments.

What is the biological significance of GLMN in human disease?

GLMN (Glomulin) plays a regulatory role in the Cullin-RING ubiquitin ligase complex and is genetically linked to glomuvenous malformations (GVMs), a rare hereditary vascular disorder. Loss-of-function mutations in the GLMN gene disrupt normal vascular smooth muscle cell differentiation, leading to the characteristic vascular lesions seen in GVM patients.

How should I contact Aladdin Scientific for technical support regarding rp375977?

For technical inquiries regarding Recombinant Human GLMN Protein (rp375977), please contact Aladdin Scientific's technical support team through the official website or customer service channels. Have your lot number, order details, and a description of your experimental setup ready to facilitate a prompt and accurate response.

References

1. Tron AE, et al. Identification of Glomulin as a candidate gene for glomuvenous malformations. Nature Genetics, 2004.
2. Duda DM, et al. Structural regulation of Cullin-RING ubiquitin ligase complexes. Annual Review of Biochemistry, 2011.
3. Maerki S, et al. The Cul3-SPOP ubiquitin E3 ligase complex targets the glomuvenous malformation-causing protein glomulin. Journal of Cell Biology, 2009.

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