Biology of CACNA1B and the Cav2.2 Channel

The CACNA1B gene encodes the alpha-1B subunit of the N-type (neuronal-type) voltage-gated calcium channel, designated Cav2.2. This subunit forms the ion-conducting pore of the channel and is the principal determinant of its biophysical and pharmacological properties. N-type calcium channels are predominantly expressed in the nervous system, particularly in presynaptic terminals of neurons, where they couple membrane depolarization to neurotransmitter release.

Upon membrane depolarization, Cav2.2 channels open and permit calcium influx, which triggers vesicle fusion and exocytosis of neurotransmitters including glutamate, GABA, and norepinephrine. Because of their central role in synaptic transmission, CACNA1B and the Cav2.2 channel are strongly implicated in pain signaling, epilepsy, and psychiatric disorders. The channel is selectively inhibited by the peptide toxin omega-conotoxin GVIA, which is widely used as a research tool to distinguish N-type from other high-voltage-activated calcium channels.

Alternative splicing of the CACNA1B transcript generates multiple isoforms, allowing region-specific and developmental regulation of channel properties. These isoforms may differ in their voltage dependence, inactivation kinetics, and interaction with auxiliary subunits (alpha-2/delta and beta subunits), adding complexity to the channel's physiological roles.

Recombinant Protein Production and Specifications

Recombinant Human CACNA1B Protein (Aladdin Scientific SKU: rp370147) is produced using recombinant protein expression technology to yield a defined, reproducible form of the human CACNA1B alpha-1B subunit or a functional fragment thereof. Recombinant production overcomes the challenges associated with purifying native full-length calcium channel proteins from tissue, which are membrane-embedded and present at low abundance.

Typical recombinant preparations of CACNA1B fragments or domains are expressed in suitable host systems and purified under controlled conditions to deliver consistent lot-to-lot quality. Researchers should consult the product datasheet for confirmed expression host, tag information, molecular weight, purity grade, buffer composition, and recommended storage conditions specific to lot rp370147, as these parameters are critical for experimental reproducibility.

Proper handling is essential: recombinant proteins should be aliquoted upon receipt to avoid repeated freeze-thaw cycles, stored at the temperature specified on the datasheet (typically -20°C or -80°C), and used within the recommended timeframe to maintain activity and integrity.

Research Applications

Recombinant Human CACNA1B Protein supports a range of biochemical and cell biology research applications. Key uses include:

• Protein–protein interaction studies: CACNA1B fragments are used in pull-down assays, co-immunoprecipitation experiments, and surface plasmon resonance (SPR) studies to map interactions with auxiliary calcium channel subunits, scaffolding proteins, and regulatory molecules such as G-protein beta-gamma subunits.
• Antibody development and validation: Recombinant CACNA1B protein serves as an antigen for generating and validating antibodies for immunohistochemistry (IHC), Western blot, and immunofluorescence applications.
• Drug discovery and screening: As N-type calcium channels are validated targets for analgesic drug development, recombinant CACNA1B protein and derived assays support identification of small-molecule modulators and peptide inhibitors.
• Structural biology: Soluble domain constructs of CACNA1B facilitate crystallography and cryo-electron microscopy studies aimed at elucidating channel architecture and gating mechanisms.
• ELISA and binding assays: Recombinant protein is used as a coating antigen or standard in quantitative assays measuring CACNA1B-specific binding or antibody titers.

Researchers in neuroscience, pain biology, and cardiovascular physiology will find this reagent particularly relevant to studies of excitation–secretion coupling and calcium-dependent signal transduction.

Storage, Handling, and Quality Considerations

To maintain the functional integrity of Recombinant Human CACNA1B Protein, adherence to recommended storage and handling protocols is essential:

• Temperature: Store according to the datasheet specification. Most recombinant proteins are stored at -80°C for long-term stability or at -20°C for short-term use. Avoid storage at 4°C for extended periods.
• Freeze-thaw cycles: Minimize repeated freeze-thaw events by preparing single-use aliquots immediately upon receipt. Each freeze-thaw cycle can degrade protein structure and reduce activity.
• Buffer and carrier protein: Some formulations include carrier proteins (e.g., BSA) or stabilizing excipients. Verify compatibility with downstream assays, especially those sensitive to BSA or specific buffer components.
• Sterility: If the protein is intended for cell-based assays, confirm sterility status and filter sterilize if required.
• Quality control: Aladdin Scientific applies quality control testing to recombinant protein products. Refer to the Certificate of Analysis (CoA) supplied with each lot for purity, identity, and activity data.

Researchers encountering unexpected results should compare experimental conditions against the datasheet recommendations and contact Aladdin Scientific technical support for troubleshooting guidance.