L-lactate dehydrogenase A chain
L-lactate dehydrogenase A chain (254-265) is a synthetic peptide fragment corresponding to amino acids 254 through 265 of the LDH-A enzyme, a key isoform of lactate dehydrogenase involved in cellular energy metabolism. As a peptide derivative of a crucial glycolytic enzyme, this sequence segment holds functional significance in studies of enzyme structure, protein-protein interactions, and post-translational modifications. Its defined sequence and origin from the LDH-A isoform make it valuable for dissecting the biochemical and regulatory properties of lactate dehydrogenase in both physiological and pathological contexts, particularly in the investigation of metabolic reprogramming and enzyme regulation in cells.
Enzyme structure-function analysis: The peptide fragment representing residues 254-265 of LDH-A serves as a model for probing the structural determinants of enzyme activity and specificity. Researchers utilize this sequence to map functional domains within the LDH-A protein, investigate potential allosteric sites, and assess the impact of sequence motifs on catalytic efficiency. By isolating this segment, it becomes possible to study how localized sequence variations influence the overall conformation and function of the enzyme, providing mechanistic insights into glycolytic regulation.
Epitope mapping and antibody development: As a defined sequence from the LDH-A chain, this peptide is frequently employed as an immunogen or antigenic probe in the generation and characterization of antibodies specific to the LDH-A isoform. Its use facilitates the identification of linear epitopes, supports the creation of highly selective detection reagents, and aids in the development of immunoassays for LDH-A quantification in biochemical and cell-based studies. Such applications are critical for distinguishing LDH-A from other lactate dehydrogenase isoforms in complex biological samples.
Protein-protein interaction studies: The LDH-A (254-265) peptide is a valuable tool for elucidating binding interactions involving the C-terminal region of the enzyme. By serving as a competitive inhibitor or as a bait in affinity-based assays, it enables the identification and characterization of cellular factors that interact with LDH-A at or near this site. This approach supports research into regulatory mechanisms controlling enzyme localization, assembly, or activity, particularly in the context of metabolic adaptation and cellular signaling pathways.
Post-translational modification analysis: Synthetic peptides corresponding to specific regions of enzymes like LDH-A are routinely used to investigate post-translational modifications, such as phosphorylation, acetylation, or methylation, that may occur within these segments. The 254-265 sequence can be subjected to in vitro modification or used as a substrate for modifying enzymes, supporting the identification of regulatory sites and the study of their functional consequences. Such research is instrumental in understanding how modifications influence LDH-A stability, activity, or subcellular distribution.
Peptide-based assay development: The defined nature and sequence specificity of this peptide make it suitable for use in biochemical assays designed to measure enzyme interactions, substrate recognition, or inhibitor screening. Its incorporation into assay platforms enables the quantitative analysis of binding affinities, the assessment of small molecule modulators, and the validation of peptide-based probes. These applications are essential for supporting drug discovery efforts targeting metabolic enzymes and for advancing the toolkit available for high-throughput biochemical screening.
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