Histidine protein methyltransferase 1 homolog (142-156)

Histidine protein methyltransferase 1 homolog (142-156) is a synthetic peptide fragment corresponding to residues 142 through 156 of the human HMT1 protein. As an engineered peptide, it represents a specific segment of the larger histidine protein methyltransferase 1 homolog, a key enzyme implicated in post-translational methylation of histidine residues within protein substrates. This peptide is utilized extensively in biochemical and molecular biology research to elucidate substrate recognition, methylation site specificity, and the broader regulatory mechanisms governed by protein methyltransferases. Its sequence specificity and defined structure make it a valuable reagent for dissecting the molecular underpinnings of histidine methylation and for advancing our understanding of protein modification pathways.

Enzyme substrate studies: Researchers employ the 142-156 peptide fragment as a model substrate in in vitro methyltransferase assays. By providing a defined target for histidine methyltransferase enzymes, the peptide enables precise characterization of enzymatic activity, substrate specificity, and kinetic parameters. This approach is instrumental for mapping methylation sites, investigating enzyme-substrate affinity, and identifying potential regulatory motifs within the parent protein. The ability to use a synthetic peptide overcomes the complexity of full-length proteins, allowing for controlled experimental conditions and reproducible results.

Epitope mapping and antibody validation: The defined sequence of this peptide fragment serves as a valuable tool in antibody development and validation workflows. It is often used to map epitopes recognized by antibodies raised against HMT1 or related methylated proteins. Synthetic peptides corresponding to specific protein regions enable researchers to assess antibody specificity, cross-reactivity, and binding affinity. Such applications are essential for generating reliable immunological reagents and for supporting downstream techniques such as western blotting, immunoprecipitation, and ELISA.

Protein-protein interaction studies: The 142-156 segment can be applied in studies aiming to delineate protein-protein interactions involving HMT1 or its substrates. By immobilizing the peptide on solid supports or incorporating it into pull-down assays, researchers can identify and characterize binding partners that interact with this region. These experiments contribute to a deeper understanding of the molecular networks regulated by histidine methylation and can reveal novel interactors or regulatory factors associated with the HMT1 pathway.

Peptide modification and structure-function analysis: The peptide provides a versatile platform for introducing site-specific modifications, such as methylation or labeling with isotopic or fluorescent tags. Such modifications facilitate detailed structure-function analyses, enabling researchers to investigate the impact of specific amino acid changes or post-translational modifications on peptide conformation, stability, and intermolecular interactions. These studies are critical for deciphering the functional consequences of histidine methylation and for advancing the rational design of peptide-based probes or inhibitors.

Analytical method development: Utilization of the 142-156 peptide in mass spectrometry and chromatographic method development supports the accurate detection and quantification of histidine methylation events. Its well-defined sequence and modifiable nature make it an ideal standard for optimizing analytical workflows, calibrating instrumentation, and validating assay sensitivity and specificity. By serving as a reference peptide, it aids in the reproducible identification of methylation signatures within complex biological samples, thereby enhancing the reliability of proteomic investigations.

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