p53 (103-111)

p53 (103-111) is a synthetic peptide corresponding to residues 103 through 111 of the human p53 tumor suppressor protein, a critical regulator of cell cycle and genomic stability. As a defined peptide fragment, it encompasses a region of p53 implicated in protein-protein interactions and post-translational modifications. The sequence represents a functionally significant domain that has been extensively studied for its role in mediating the biological activities of p53, particularly in the context of cellular stress responses, DNA damage recognition, and apoptotic signaling pathways. Researchers utilize this peptide as a versatile molecular tool to dissect the mechanistic underpinnings of p53 function, making it highly relevant for diverse applications in molecular and cellular biology.

Protein-Protein Interaction Studies: The 103-111 region of p53 is known to participate in binding interactions with various cellular partners, including regulatory proteins and enzymes involved in post-translational modification. By employing this peptide fragment in binding assays, researchers can investigate the specificity and affinity of such interactions, map critical contact residues, and characterize the molecular determinants underlying complex formation. These insights are instrumental for elucidating the broader interactome of p53 and for understanding how its activity is modulated by cellular cofactors.

Phosphorylation and Post-Translational Modification Analysis: Residues within the p53 (103-111) peptide are targets for phosphorylation and other covalent modifications, which are key to the dynamic regulation of p53 activity in response to cellular stress. The synthetic peptide serves as a substrate in in vitro kinase assays, enabling the identification of modifying enzymes and the assessment of modification-dependent changes in peptide properties. Such studies facilitate the exploration of signaling pathways that converge on p53 and provide a platform for screening inhibitors or modulators of these enzymatic processes.

Antibody Generation and Epitope Mapping: As a defined segment of the p53 protein, the 103-111 peptide is frequently used as an immunogen for the production of polyclonal or monoclonal antibodies specific to this region. These antibodies are critical reagents for detecting endogenous or recombinant p53 in immunoassays, Western blotting, and immunoprecipitation experiments. Furthermore, the peptide enables fine mapping of antibody binding sites, supporting the development of highly specific detection tools for research and diagnostic applications.

Structural and Biophysical Characterization: The isolated p53 (103-111) peptide provides a tractable model for structural studies, including nuclear magnetic resonance (NMR) spectroscopy and circular dichroism (CD) analysis. By examining the conformational properties of this fragment in solution or in complex with binding partners, researchers can gain insight into the structural motifs that govern p53 function. Such analyses contribute to a deeper understanding of how local sequence elements influence the stability, flexibility, and interaction potential of the full-length protein.

Peptide-Based Screening and Inhibitor Development: Due to its defined sequence and functional relevance, the 103-111 peptide is employed in high-throughput screening platforms for the identification of small molecules or peptides that disrupt or enhance p53 interactions. It serves as a template for rational design of mimetics or competitive inhibitors that can modulate p53-associated pathways in cellular models. These approaches are valuable for probing the regulatory mechanisms of p53 and for advancing the discovery of novel modulators for research purposes.

1. The effect of sex on immune responses to a homocitrullinated peptide in the DR4-transgenic mouse model of Rheumatoid Arthritis

2. Multifunctional peptide-oligonucleotide conjugate promoted sensitive electrochemical biosensing of cardiac troponin I

3. The effect of B-type allatostatin neuropeptides on crosstalk between the insect immune response and cold tolerance

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

5. The spatiotemporal control of signalling and trafficking of the GLP-1R