Human type 3 inositol 1,4,5-trisphosphate receptor (2354-2362)

Human type 3 inositol 1,4,5-trisphosphate receptor (2354-2362) is a synthetic peptide fragment corresponding to a specific region within the C-terminal domain of the type 3 isoform of the inositol 1,4,5-trisphosphate receptor (IP3R3). As a key intracellular calcium channel, IP3R3 plays a pivotal role in the regulation of calcium signaling pathways, which are fundamental to numerous cellular processes including secretion, metabolism, and cell proliferation. The 2354-2362 peptide sequence is highly relevant to research focused on understanding the structure-function relationships, regulatory mechanisms, and interaction interfaces of the receptor, making it a valuable tool in the field of cellular signaling and receptor biology.

Peptide mapping: The 2354-2362 fragment is frequently employed in peptide mapping studies aimed at delineating the functional domains of IP3R3. By using this defined sequence, researchers can identify critical residues and motifs involved in receptor activation, modulation, or binding interactions. Such mapping supports the elucidation of the structural determinants that underlie receptor specificity and activity, thereby advancing the broader understanding of calcium channel regulation in mammalian cells.

Protein-protein interaction analysis: This synthetic peptide serves as an effective probe for investigating protein-protein interactions involving the C-terminal region of IP3R3. In biochemical assays such as pull-downs, co-immunoprecipitation, or surface plasmon resonance, the peptide can be used to identify and characterize binding partners that modulate receptor function or participate in downstream signaling pathways. These studies contribute to the identification of novel regulatory proteins and the dissection of complex signaling networks.

Antibody epitope characterization: The defined sequence of the 2354-2362 peptide provides a precise target for generating and validating antibodies specific to the C-terminal domain of IP3R3. It can be utilized in immunization protocols for antibody production or in affinity purification workflows to ensure specificity. Additionally, the peptide is useful in epitope mapping experiments, helping to pinpoint antibody binding sites and optimize reagents for immunodetection or immunoprecipitation applications.

Phosphorylation and post-translational modification studies: The C-terminal region of IP3R3 is known to undergo regulatory post-translational modifications, including phosphorylation. The 2354-2362 peptide enables in vitro kinase assays and mass spectrometry-based analyses to investigate modification sites and their functional consequences. By serving as a substrate or reference standard, it facilitates the study of how specific modifications influence receptor activity, localization, or protein interactions.

Structural and biophysical research: The availability of the 2354-2362 peptide supports structural and biophysical investigations into the conformational dynamics of the IP3 receptor's C-terminal domain. Techniques such as NMR spectroscopy, circular dichroism, or molecular modeling benefit from well-defined peptide fragments, allowing researchers to probe secondary structure propensity, folding behavior, or ligand-induced conformational changes in a controlled context. These insights are instrumental in advancing the molecular-level understanding of receptor function and regulation.

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