Recombinant Human GABRR1 Protein: Handling & Usage Protocol

Recombinant Human GABRR1 Protein is a research-grade recombinant protein representing the rho-1 subunit of the GABA type-A receptor family, supplied by Aladdin Scientific for use in ion channel research, neuropharmacology, and related in vitro studies.

Product Name

Recombinant Human GABRR1 Protein

SKU

rp370071

Gene / Protein Target

GABRR1 (GABA type A receptor subunit rho-1)

Species Origin

Human (Homo sapiens)

Recommended Storage

Store lyophilized protein at -20°C or -80°C; avoid repeated freeze-thaw cycles

Primary Applications

Biochemical assays, binding studies, ion channel research, drug discovery screening

Quality / Grade

Research use only (RUO)

Background: GABRR1 and the GABA Receptor Family

Gamma-aminobutyric acid (GABA) is the principal inhibitory neurotransmitter in the mammalian central nervous system. GABRR1 encodes the rho-1 subunit of the GABA type-A receptor, a ligand-gated chloride ion channel. Receptors containing rho subunits are sometimes classified as GABA-C receptors due to their distinct pharmacological profile compared with classical GABA_A receptors; they are insensitive to bicuculline and not potentiated by benzodiazepines or barbiturates.

GABRR1 is prominently expressed in the retina and is also detected in the brain. Research into GABRR1 supports investigations into visual signal processing, epilepsy, and the pharmacology of inhibitory neurotransmission. Recombinant Human GABRR1 Protein enables in vitro studies of receptor–ligand interactions, subunit assembly, and structure–function relationships without dependence on native tissue preparations.

Materials and Equipment Required

• Recombinant Human GABRR1 Protein (rp370071, Aladdin Scientific)
• Sterile, nuclease-free water or compatible reconstitution buffer (e.g., PBS, pH 7.4)
• Low-protein-binding microcentrifuge tubes (1.5 mL)
• Calibrated micropipettes and sterile tips
• Microcentrifuge (capable of ≥10,000 × g)
• –20°C and/or –80°C freezer for storage
• Carrier protein solution (e.g., 0.1% BSA in PBS) for dilution if required
• Dry ice or liquid nitrogen for transport aliquots

Step-by-Step Reconstitution and Storage Protocol

Step 1 – Pre-reconstitution preparation

Allow the lyophilized vial to equilibrate to room temperature (18–25°C) for 10–15 minutes before opening. This reduces condensation and the risk of protein loss on the cap or walls of the vial.

Step 2 – Reconstitution

Add the recommended volume of sterile reconstitution buffer (typically sterile deionized water or PBS, pH 7.4) gently along the inner wall of the vial. Do not vortex. Gently swirl or pipette up and down until the lyophilizate is fully dissolved. Centrifuge briefly at low speed (e.g., 500 × g, 30 seconds) to collect any residual material from the walls.

Note: The specific reconstitution volume and resulting concentration are defined on the product datasheet for rp370071. Consult the datasheet before proceeding.

Step 3 – Aliquoting

Immediately divide the reconstituted protein into single-use aliquots using low-protein-binding tubes. Working aliquots minimize repeated freeze-thaw cycles, which degrade protein activity and integrity.

Step 4 – Storage

Store lyophilized, unreconstituted protein at –20°C or –80°C. Store reconstituted aliquots at –80°C for long-term use, or at –20°C for short-term use (up to 1 month). Avoid repeated freeze-thaw cycles (limit to ≤3 cycles). A carrier protein such as 0.1% BSA may be added to diluted working solutions to prevent adsorption to tube surfaces at low concentrations.

Step 5 – Quality check before use

Inspect the reconstituted solution for visible aggregates or turbidity. If aggregation is suspected, centrifuge at 10,000 × g for 5 minutes at 4°C and use the clarified supernatant. Protein integrity can be verified by SDS-PAGE prior to downstream assays.

Application Guidelines

Recombinant Human GABRR1 Protein is suitable for a range of in vitro research applications, including but not limited to:

• Ligand-binding assays: Use as a target protein to characterize binding kinetics of GABA-C receptor agonists, antagonists, or allosteric modulators.
• Protein–protein interaction studies: Investigate subunit–subunit interactions within the GABA receptor complex using pull-down or co-immunoprecipitation assays.
• Antibody validation: Serve as a positive control antigen for ELISA, western blotting, or immunoprecipitation experiments targeting GABRR1.
• Drug discovery screening: Use in biochemical assays to screen compound libraries for modulators of rho-subunit-containing GABA receptors.
• Structural studies: Supply pure recombinant protein for crystallography or cryo-EM studies (verify purity and homogeneity requirements with the product datasheet).

Optimal working concentrations and assay conditions must be determined empirically for each experimental system. Refer to published literature and the product datasheet for guidance.

Troubleshooting and Best Practices

Problem	Possible Cause	Recommended Action
Protein aggregation after reconstitution	Rapid temperature change; buffer incompatibility	Allow vial to reach room temperature before reconstitution; use recommended buffer; centrifuge to clarify
Low or no activity in assay	Repeated freeze-thaw; improper storage temperature	Use freshly thawed single-use aliquots; verify storage conditions; confirm assay buffer compatibility
Unexpected band size on SDS-PAGE	Glycosylation or post-translational modifications; reduction conditions	Run under both reducing and non-reducing conditions; consult product datasheet for expected MW
Protein loss during dilution	Adsorption to tube surfaces at low concentrations	Add 0.1% BSA as carrier; use low-protein-binding tubes

General best practice: Always work on ice once the protein is thawed. Handle aliquots with pre-chilled pipette tips where possible. Record lot numbers and storage conditions for each experiment to ensure reproducibility.

Frequently asked questions

What buffer is recommended for reconstituting Recombinant Human GABRR1 Protein (rp370071)?

The specific reconstitution buffer and volume are provided on the product datasheet for rp370071. In general, sterile deionized water or PBS (pH 7.4) is suitable for most recombinant proteins; however, always consult the datasheet for lot-specific instructions to ensure optimal solubility and activity.

How many freeze-thaw cycles can Recombinant Human GABRR1 Protein withstand?

As a general guideline for recombinant proteins, it is recommended to limit freeze-thaw cycles to three or fewer. Repeated freezing and thawing can cause protein denaturation, aggregation, and loss of biological activity. Aliquoting into single-use volumes upon first reconstitution is the best practice to avoid this issue.

Is Recombinant Human GABRR1 Protein (rp370071) suitable for use in cell-based assays?

Recombinant Human GABRR1 Protein is primarily intended for in vitro biochemical and binding studies. Suitability for cell-based assays depends on the specific experimental design, protein formulation, and whether the protein has been produced in a format compatible with functional cell assays. Please consult the product datasheet or contact Aladdin Scientific technical support for guidance specific to your application.

What is the difference between GABRR1 rho subunit-containing receptors and classical GABA-A receptors?

Receptors assembled from rho subunits (including GABRR1) form homomeric or heteromeric channels with a distinct pharmacological profile: they are insensitive to bicuculline (a classical GABA-A antagonist), and are not modulated by benzodiazepines or barbiturates. These properties make rho-subunit receptors, sometimes called GABA-C receptors, a unique target for pharmacological research, particularly in the context of retinal physiology and visual processing.

How should I verify protein quality before starting experiments?

Protein quality can be assessed by SDS-PAGE to confirm apparent molecular weight and purity, and by spectrophotometric measurement (A280) to determine concentration. For functional studies, an activity assay appropriate to the protein target should be performed. Consult the product datasheet for the quality control data provided by Aladdin Scientific for each lot of rp370071.

References

1. Bormann J. The 'ABC' of GABA receptors. Trends Pharmacol Sci. 2000;21(1):16-19. doi:10.1016/S0165-6147(99)01413-3
2. Enz R, Cutting GR. Molecular composition of GABAC receptors. Vision Res. 1998;38(10):1449-1452. doi:10.1016/S0042-6989(97)00277-5
3. Aladdin Scientific. Recombinant Human GABRR1 Protein (rp370071) Product Datasheet. Aladdin Scientific; [current version]. Available from: https://www.aladdin-e.com

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