Recombinant Human GPRIN3 Protein: Handling & Usage Protocol

Recombinant Human GPRIN3 Protein is a research-grade reagent designed to support investigations into G protein-regulated neurite outgrowth signaling, protein–protein interactions, and related neurobiological pathways.

Product Name

Recombinant Human GPRIN3 Protein

SKU

rp375067

Protein Family

GPRIN (G Protein-Regulated Inducer of Neurite Outgrowth) family

Species Origin

Human (Homo sapiens)

Primary Applications

Functional assays, protein interaction studies, neuroscience research

Supplier Reference

absea #PP-8800

Background & Biological Significance of GPRIN3

GPRIN3 (G Protein-Regulated Inducer of Neurite Outgrowth 3) is a member of the GPRIN protein family, which plays roles in neuronal signaling and neurite outgrowth. Members of this family are known to interact with activated G protein alpha subunits and have been implicated in modulating intracellular signaling cascades relevant to neuronal morphology and connectivity.

GPRIN3 has attracted research interest in the context of striatal neuron function and has been studied for its potential involvement in addiction-related signaling pathways. As a recombinant human protein, this reagent enables researchers to study GPRIN3 function, binding partners, and downstream effects in controlled in vitro settings.

Reconstitution & Storage Guidelines

Reconstitution: It is recommended to briefly centrifuge the vial before opening to collect lyophilized material at the bottom. Reconstitute the protein in sterile, deionized water or an appropriate aqueous buffer (e.g., PBS, pH 7.4) to a stock concentration as specified on the product datasheet. Gently pipette to mix; avoid vortexing, which may cause protein denaturation.

Short-term storage: Reconstituted protein should be stored at 4 °C if it will be used within 1–2 weeks. For optimal stability, add a carrier protein such as 0.1% BSA if working at low concentrations.

Long-term storage: Aliquot the reconstituted protein to minimize freeze-thaw cycles and store at −20 °C or −80 °C. Repeated freeze-thaw cycles should be strictly avoided as they may compromise protein activity and integrity.

Note: Always refer to the specific lot Certificate of Analysis (CoA) and product datasheet for exact reconstitution volumes, recommended buffers, and storage conditions, as these may vary by lot.

Step-by-Step Experimental Protocol

1. Preparation: Thaw the aliquot on ice. Do not heat or vortex. Briefly centrifuge the tube (1,000 × g, 30 seconds) to collect contents.
2. Reconstitution (if lyophilized): Add the recommended volume of sterile buffer dropwise to the vial. Gently swirl or pipette to dissolve completely. Allow 10 minutes at room temperature if necessary.
3. Concentration determination: Measure protein concentration using a validated method (e.g., BCA assay or A280 absorbance) before use in experiments, referencing the extinction coefficient provided on the datasheet.
4. Experimental setup: Dilute the protein to the desired working concentration in assay-compatible buffer. Include appropriate positive and negative controls in all experiments.
5. Functional or binding assay: Add GPRIN3 protein to the assay system (e.g., co-immunoprecipitation, pull-down, ELISA-based binding, or cell-based assay) according to the specific assay protocol requirements.
6. Analysis: Detect and quantify results using the appropriate analytical method (e.g., SDS-PAGE, Western blot, fluorescence readout). Validate results with replicate experiments.
7. Post-experiment: Discard unused diluted protein. Return unused aliquots to storage immediately to preserve activity.

Quality Control & Purity Considerations

Recombinant Human GPRIN3 Protein from Aladdin Scientific is manufactured and quality-controlled to research-grade standards. Each lot is typically assessed for purity by SDS-PAGE and/or HPLC, and biological activity may be confirmed by functional assay where applicable. Refer to the Certificate of Analysis (CoA) supplied with each lot for specific purity, endotoxin, and activity data.

Key quality parameters to verify upon receipt:

• Purity (typically assessed by SDS-PAGE; expected band at the predicted molecular weight)
• Endotoxin level (relevant for cell-based assays; check CoA for LAL test results)
• Biological activity (if provided; compare with reference standard on CoA)
• Appearance (lyophilized cake or clear solution, as stated on datasheet)

If quality concerns arise — such as unexpected banding patterns, precipitation, or loss of activity — contact Aladdin Scientific technical support and retain the product and packaging for evaluation.

Troubleshooting Common Issues

Protein aggregation or precipitation: Ensure reconstitution buffer and pH are appropriate. Work at recommended protein concentrations and avoid freeze-thaw cycles. If aggregation persists, try centrifuging the reconstituted solution at low speed (10,000 × g, 5 min, 4 °C) and use the supernatant.

Low or no detectable activity: Verify that the protein has not undergone repeated freeze-thaw cycles. Confirm that assay conditions (buffer, pH, temperature, co-factors) are appropriate for GPRIN3. Ensure the detection method is validated and sensitive enough for the concentration range used.

Unexpected molecular weight on SDS-PAGE: GPRIN3 may migrate differently from the predicted molecular weight due to glycosylation, post-translational modifications, or tag sequences. Consult the datasheet for the expected molecular weight range under reducing and non-reducing conditions.

High background in binding assays: Optimize blocking conditions and antibody/probe concentrations. Include carrier protein (BSA) in binding buffers to reduce non-specific interactions.

Frequently asked questions

What is GPRIN3 and why is it relevant to neuroscience research?

GPRIN3 is a member of the G Protein-Regulated Inducer of Neurite Outgrowth (GPRIN) protein family, implicated in neuronal signaling, neurite outgrowth, and interactions with G protein alpha subunits. It has been studied in the context of striatal neuron function and addiction-related pathways, making it a relevant target for researchers in neurobiological and pharmacological fields.

How should Recombinant Human GPRIN3 Protein be reconstituted and stored?

Reconstitute lyophilized GPRIN3 protein by adding sterile deionized water or PBS (pH 7.4) to the vial and gently mixing without vortexing. Store short-term at 4 °C (1–2 weeks) or long-term at −20 °C or −80 °C in single-use aliquots to avoid freeze-thaw degradation. Always consult the product-specific CoA and datasheet for exact volumes and conditions.

What applications is Recombinant Human GPRIN3 Protein suitable for?

Recombinant Human GPRIN3 Protein is suitable for a range of in vitro research applications including protein–protein interaction studies (co-immunoprecipitation, pull-down assays), binding assays (ELISA-based formats), functional characterization assays, and as a reference standard in Western blot or ELISA. Suitability for specific applications should be confirmed against the product datasheet.

How do I verify the quality of the received GPRIN3 protein lot?

Upon receipt, check the Certificate of Analysis (CoA) for purity (SDS-PAGE), endotoxin content (LAL test), and biological activity data. Visually inspect the vial for integrity. For SDS-PAGE verification, run a small aliquot under both reducing and non-reducing conditions and compare the observed molecular weight band(s) with the expected values on the CoA.

Can I use GPRIN3 protein in cell-based assays?

Recombinant Human GPRIN3 Protein may be used in cell-based assays, but endotoxin levels should be carefully checked on the CoA prior to use, as endotoxin contamination can confound cell-based results. Optimize protein concentration and delivery format for your specific cell system, and include appropriate controls.

References

1. Regulska M, et al. GPRIN family proteins in the nervous system: structure, interactions and physiological function. Review article. (General reference — verify specific GPRIN3 publications in PubMed.)
2. Smithson LJ, Bhatt DL. G protein-regulated inducers of neurite outgrowth (GPRINs): emerging roles in neural signaling. (Placeholder — verify exact title, authors, journal, and year in PubMed.)
3. Aladdin Scientific Product Datasheet: Recombinant Human GPRIN3 Protein, SKU rp375067. Aladdin Scientific. (Access current version at Aladdin Scientific official website.)

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