Recombinant Human GRIP2 Protein: Properties & Research Uses

Recombinant Human GRIP2 Protein is a multi-PDZ domain scaffold protein that plays a central role in the trafficking, anchoring, and synaptic localization of AMPA-type glutamate receptors in the central nervous system.

Protein Name

Recombinant Human GRIP2 Protein

Also Known As

Glutamate Receptor-Interacting Protein 2; GRIP2; GRASP-1 related; ABP (AMPA receptor-binding protein)

Protein Family

PDZ domain-containing scaffold proteins

Key Domains

Multiple PDZ domains (PDZ1–PDZ7) mediating protein–protein interactions

Primary Function

Scaffolding and anchoring of AMPA receptors at synapses; regulation of receptor trafficking

Relevant SKU

rp372883

What Is GRIP2? Gene, Structure, and Isoforms

GRIP2 (Glutamate Receptor-Interacting Protein 2), also referred to as ABP (AMPA receptor-binding protein) in some literature, is encoded by the GRIP2 gene in humans. It belongs to a family of large scaffold proteins characterized by tandem arrays of PDZ (PSD-95/Dlg/ZO-1) domains. GRIP2 contains up to seven PDZ domains (PDZ1–PDZ7) that serve as modular protein–protein interaction units, enabling GRIP2 to act as a molecular organizer at postsynaptic densities.

The protein shares significant homology with GRIP1 and together they constitute the GRIP subfamily of PDZ proteins. Alternative splicing of the GRIP2 gene gives rise to multiple isoforms with distinct N-terminal sequences, which may influence subcellular targeting and binding partner selectivity. Expression of GRIP2 is particularly enriched in neurons of the central nervous system, consistent with its role in synaptic organization.

Biological Function: AMPA Receptor Trafficking and Synaptic Plasticity

The best-characterized function of GRIP2 is its interaction with the C-terminal PDZ-binding motifs of GluA2 (GluR-B) and GluA3 (GluR-C) subunits of AMPA receptors. Through these interactions, GRIP2 is believed to stabilize AMPA receptors at the postsynaptic membrane and to regulate their intracellular trafficking, including endocytic recycling and lateral membrane diffusion.

GRIP2 participates in the molecular machinery underlying long-term potentiation (LTP) and long-term depression (LTD), forms of synaptic plasticity that are widely regarded as cellular correlates of learning and memory. During LTD, AMPA receptors are internalized; GRIP2 is thought to coordinate receptor sorting in endosomal compartments, directing receptors either back to the synapse or toward degradation pathways. Disruption of GRIP2–GluA2 interactions has been implicated in altered synaptic strength and, in some experimental models, in neurological and psychiatric phenotypes.

Beyond AMPA receptor biology, GRIP2 interacts with additional partners including liprin-α, EphB receptors, and PICK1, situating it at the crossroads of multiple synaptic signaling cascades.

Research Applications of Recombinant Human GRIP2 Protein

Recombinant Human GRIP2 Protein (SKU: rp372883) is suitable for a range of in vitro biochemical and cell biology applications:

• Protein–protein interaction studies: Pull-down assays and co-immunoprecipitation experiments to map PDZ-domain binding partners, including GluA2/GluA3 subunits and liprin-α.
• Structural biology: Use as an antigen for antibody generation, or as a reference standard in Western blot and ELISA assays validating anti-GRIP2 antibodies.
• Enzyme-linked binding assays: Quantitative measurement of binding affinities between GRIP2 PDZ domains and synthetic or recombinant peptide/protein ligands.
• Functional reconstitution: In vitro reconstitution experiments studying AMPA receptor anchoring and trafficking mechanisms in defined biochemical systems.
• Drug discovery: Screening for small molecules that modulate GRIP2–GluA2 or GRIP2–PICK1 interactions, with potential relevance to neurological and psychiatric disorders.

Researchers should refer to the product datasheet (absea #PP-6841) for recommended storage conditions, buffer composition, and purity specifications prior to use.

Handling, Storage, and Quality Considerations

Recombinant proteins require careful handling to maintain activity and integrity. General best-practice guidelines applicable to Recombinant Human GRIP2 Protein include:

• Storage: Store at –80 °C for long-term preservation. Avoid repeated freeze–thaw cycles, which can cause aggregation and loss of functional activity. Aliquot upon receipt if multiple uses are anticipated.
• Reconstitution: If supplied lyophilized, reconstitute in the buffer specified in the product datasheet. Allow the vial to equilibrate to room temperature before opening.
• Working concentrations: Optimize empirically for each assay format. Pilot experiments at a range of concentrations are recommended before large-scale experiments.
• Quality verification: Confirm protein integrity by SDS-PAGE and purity by the method stated on the datasheet (e.g., SEC-HPLC or Coomassie-stained gel). Verify biological activity using a validated binding or functional assay.

Always consult the current product datasheet (absea #PP-6841) supplied with the product for lot-specific specifications, as these supersede general guidelines.

Frequently asked questions

What is GRIP2 protein and why is it important in neuroscience research?

GRIP2 is a multi-PDZ domain scaffold protein that interacts with AMPA-type glutamate receptors at synapses, regulating their trafficking, anchoring, and membrane stability. It is critical for synaptic plasticity processes such as LTP and LTD, making it a key target in studies of learning, memory, and synaptic dysfunction associated with neurological and psychiatric disorders.

What applications is Recombinant Human GRIP2 Protein suitable for?

Recombinant Human GRIP2 Protein (SKU: rp372883) is suitable for protein–protein interaction studies (pull-down, co-IP), antibody validation (Western blot, ELISA), quantitative binding assays, in vitro functional reconstitution of AMPA receptor complexes, and small-molecule screening campaigns targeting GRIP2 interactions. Always confirm suitability for specific assay formats by consulting the product datasheet.

How should Recombinant Human GRIP2 Protein be stored to maintain stability?

For long-term storage, keep the protein at –80 °C and avoid repeated freeze–thaw cycles by preparing single-use aliquots upon receipt. If lyophilized, reconstitute according to the datasheet instructions and allow the vial to reach room temperature before opening. Refer to absea #PP-6841 for lot-specific storage recommendations.

What is the difference between GRIP1 and GRIP2?

GRIP1 and GRIP2 are closely related paralogues that both contain multiple PDZ domains and interact with GluA2/GluA3 AMPA receptor subunits. While they share overlapping functions in receptor anchoring, they differ in their tissue expression patterns, isoform diversity, and specific binding partners, and may play distinct roles in different neuronal populations or developmental stages. Detailed functional differences remain an active area of research.

References

1. Dong H, et al. GRIP: a synaptic PDZ domain-containing protein that interacts with AMPA receptors. Nature. 1997;386(6622):279-284. doi:10.1038/386279a0
2. Srivastava S, et al. Novel anchorage of GluR2/3 to the postsynaptic density by the AMPA receptor-binding protein ABP. Neuron. 1998;21(3):581-591. doi:10.1016/S0896-6273(00)80568-1
3. Bhattacharyya S, et al. Neurotransmitter receptor trafficking: mechanisms and synaptic plasticity. Current Opinion in Neurobiology. 2009.

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