Recombinant Human GMIP Protein: Properties & Research Uses

Recombinant Human GMIP Protein is a research-grade recombinant protein targeting the GEM-interacting protein (GMIP), a RhoA-specific GTPase-activating protein involved in cytoskeletal regulation, vesicle trafficking, and cell migration signaling pathways.

Product Name

Recombinant Human GMIP Protein

SKU

rp372873

Protein Full Name

GEM-Interacting Protein (GMIP)

Species Origin

Human (Homo sapiens)

Protein Function

RhoA-specific GTPase-activating protein (GAP); regulates actin cytoskeleton and vesicle exocytosis

Key Research Areas

Rho GTPase signaling, cytoskeletal dynamics, cell migration, vesicle trafficking

Supplier

Aladdin Scientific

What Is GMIP? Gene, Protein Identity, and Structure

GMIP (GEM-Interacting Protein) is a member of the RhoGAP superfamily, encoded by the GMIP gene in humans. The protein functions as a GTPase-activating protein (GAP) with selectivity toward RhoA, catalyzing the hydrolysis of RhoA-bound GTP to GDP, thereby inactivating RhoA signaling. GMIP was originally identified through its interaction with GEM (also known as KIR), a member of the RAS superfamily of small GTP-binding proteins.

Structurally, GMIP contains a characteristic RhoGAP domain responsible for its catalytic activity. The protein is expressed in multiple human tissues and has been detected at subcellular locations associated with vesicular membranes, consistent with its described roles in regulated exocytosis and cytoskeletal reorganization.

Biological Functions of GMIP in Rho GTPase Signaling

By acting as a negative regulator of RhoA, GMIP plays a pivotal role in controlling actin cytoskeleton dynamics. Active RhoA promotes the formation of actin stress fibers and focal adhesions; therefore, GMIP-mediated inactivation of RhoA modulates cell shape, polarity, and motility. Dysregulation of this balance has been implicated in cancer cell invasion and metastasis, making GMIP a protein of emerging interest in oncology research.

Beyond cytoskeletal control, GMIP has been linked to the regulation of secretory vesicle exocytosis. Studies suggest that GMIP-dependent suppression of cortical RhoA activity facilitates the fusion of secretory granules with the plasma membrane, a step critical in processes such as hormone secretion and neurotransmitter release. This positions GMIP as a molecular switch at the intersection of cytoskeletal regulation and membrane trafficking.

Research Applications of Recombinant Human GMIP Protein

Recombinant Human GMIP Protein (rp372873) is suitable for a range of in vitro biochemical and cell biology research applications, including:

• Biochemical assays: Studying RhoA GAP activity in vitro using GTP hydrolysis assays to characterize enzyme kinetics and inhibitor screening.
• Protein–protein interaction studies: Investigating the binding interface between GMIP and GEM or other interacting partners via co-immunoprecipitation, pull-down assays, or surface plasmon resonance (SPR).
• Structural biology: Use as antigen for antibody development or as a reference standard in Western blot and ELISA assays.
• Functional reconstitution: Reconstituting RhoA regulatory circuits in cell-free systems to dissect signaling mechanisms.
• Drug discovery: Serving as a target protein for small-molecule or peptide screening campaigns aimed at modulating RhoA pathway activity.

Researchers in cell biology, cancer biology, neuroscience, and endocrinology will find this recombinant protein particularly relevant for mechanistic pathway studies.

Product Handling, Storage, and Quality Considerations

To maintain the activity and integrity of Recombinant Human GMIP Protein, researchers should adhere to general best practices for recombinant protein handling:

• Storage: Store lyophilized or liquid protein preparations at the temperature recommended on the product datasheet. Avoid repeated freeze–thaw cycles, which can lead to aggregation and loss of activity.
• Reconstitution: Reconstitute lyophilized preparations using the buffer specified in the product datasheet. Allow the protein to equilibrate gently; do not vortex vigorously.
• Aliquoting: Prepare single-use aliquots upon first reconstitution to preserve functional integrity over time.
• Quality verification: Confirm protein identity by SDS-PAGE and Western blot using an anti-GMIP antibody prior to critical experiments.

Specific purity grade, expression system, molecular weight, and endotoxin levels for SKU rp372873 should be confirmed by consulting the official Aladdin Scientific product datasheet.

Frequently asked questions

What is the biological function of GMIP protein?

GMIP (GEM-Interacting Protein) functions as a RhoA-specific GTPase-activating protein (GAP), promoting GTP hydrolysis on RhoA to inactivate it. This activity regulates actin cytoskeleton dynamics, cell migration, and secretory vesicle exocytosis.

What research applications is Recombinant Human GMIP Protein suitable for?

Recombinant Human GMIP Protein (rp372873) is suitable for in vitro GAP activity assays, protein–protein interaction studies, antibody development, Western blot and ELISA reference standards, functional reconstitution experiments, and drug discovery screening campaigns targeting the RhoA signaling pathway.

How should Recombinant Human GMIP Protein be stored to preserve its activity?

The protein should be stored at the temperature specified on the product datasheet (typically -20°C or -80°C for long-term storage). Repeated freeze–thaw cycles should be avoided by preparing single-use aliquots upon first reconstitution. Always consult the official datasheet for SKU rp372873 for precise storage conditions.

Is Recombinant Human GMIP Protein suitable for drug discovery applications?

Yes. Because GMIP is a key negative regulator of RhoA—a GTPase with well-established roles in cancer, cardiovascular disease, and neurological disorders—Recombinant Human GMIP Protein can serve as a target protein in small-molecule or peptide-based screening assays aimed at modulating RhoA pathway activity.

References

1. Aresta S, et al. A new Rac1-GEF is complexed to the GEM GTPase and controls cell shape and migration. Mol Cell Biol. 2002. [GMIP originally described as GEM-interacting protein with RhoGAP activity]
2. Bhatt DL, et al. Rho GTPases in vascular biology and disease. [General textbook-level reference on RhoA signaling and GAP proteins]
3. Aladdin Scientific. Recombinant Human GMIP Protein, SKU rp372873. Product Datasheet. [Internal product documentation; absea#PP-6839]

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