Receptor tyrosine-protein kinase erbB-2 (1023-1032)

Receptor tyrosine-protein kinase erbB-2 (1023-1032) is a synthetic peptide fragment corresponding to a specific amino acid sequence within the intracellular domain of the human ErbB-2/HER2 receptor. As a member of the erbB family of receptor tyrosine kinases, HER2 is a critical mediator of cell signaling pathways governing proliferation, differentiation, and survival. The 1023-1032 region is situated within a functionally significant portion of the cytoplasmic tail, making this peptide a valuable molecular tool for dissecting receptor phosphorylation events, protein-protein interactions, and downstream signaling mechanisms. Its defined sequence and structural properties facilitate targeted studies in signal transduction and molecular recognition, underpinning research into the fundamental biology of receptor tyrosine kinases.

Phosphorylation studies: The peptide serves as a precise substrate for investigating site-specific phosphorylation by kinases associated with the HER2 signaling axis. By incorporating this fragment into in vitro kinase assays, researchers can monitor phosphorylation dynamics at the 1023-1032 site, enabling the identification and characterization of kinases and phosphatases that modulate HER2 activity. This approach provides mechanistic insights into how post-translational modifications within this region influence receptor function and signal propagation.

Protein interaction mapping: The defined sequence of this peptide allows for the systematic exploration of binding events between the 1023-1032 region and intracellular adaptor or effector proteins. Pull-down assays, competition experiments, and surface plasmon resonance studies utilizing the peptide can reveal specific interaction partners that recognize this motif, shedding light on the molecular determinants of HER2-mediated signaling complexes. These findings contribute to a broader understanding of how modular interaction domains engage with receptor tails in cellular contexts.

Antibody epitope characterization: The 1023-1032 peptide is frequently employed as an immunogen or as a target in epitope mapping studies to generate and validate antibodies directed against the cytoplasmic domain of HER2. By using this peptide in immunoassays such as ELISA or Western blotting, researchers can assess antibody specificity, affinity, and cross-reactivity, supporting the development of high-fidelity detection reagents for basic and translational research applications.

Signal transduction pathway analysis: Incorporation of the peptide into biochemical assays enables the dissection of downstream signaling cascades initiated by HER2 activation. By examining how modifications or mutations within the 1023-1032 sequence affect recruitment of signaling molecules, researchers can delineate the contribution of this motif to the assembly and modulation of intracellular signaling networks. This facilitates a deeper understanding of the molecular logic governing HER2-driven cellular responses.

Peptide-based inhibitor screening: The unique sequence of the 1023-1032 region provides a template for the rational design and evaluation of small molecules or peptide mimetics that disrupt critical interactions or modifications at this site. Screening efforts utilizing the peptide can identify candidate compounds that selectively interfere with protein-protein or protein-kinase interactions involving the HER2 cytoplasmic domain, offering valuable starting points for tool compound development and mechanistic studies in cellular models.

1. Relatedness of antibodies to peptides containing homocitrulline or citrulline in patients with rheumatoid arthritis

2. Immune responses to peptides containing homocitrulline or citrulline in the DR4-transgenic mouse model of rheumatoid arthritis

3. Extended exenatide administration enhances lipid metabolism and exacerbates pancreatic injury in mice on a high fat, high carbohydrate diet

4. An interdomain binding site on HIV-1 Nef interacts with PACS-1 and PACS-2 on endosomes to down-regulate MHC-I

5. Myotropic activity and immunolocalization of selected neuropeptides of the burying beetle Nicrophorus vespilloides (Coleoptera: Silphidae)