Alpha-actinin-4 (118-127)

Alpha-actinin-4 (118-127) is a synthetic peptide fragment derived from the actin-binding protein alpha-actinin-4, corresponding specifically to amino acids 118 through 127 of the parent sequence. As a member of the alpha-actinin family, alpha-actinin-4 is critically involved in cytoskeletal organization and cellular signaling, with particular roles in actin filament crosslinking and dynamic regulation of cell shape and motility. The 118-127 peptide segment provides a focused tool for dissecting the structural and functional domains of alpha-actinin-4, enabling researchers to probe protein-protein interactions, post-translational modifications, and sequence-specific activities within cellular systems. By isolating this defined region, investigators gain a versatile reagent for studying the molecular mechanisms that underlie cytoskeletal dynamics and cell adhesion processes.

Peptide mapping: In proteomic and structural biology research, the 118-127 fragment serves as a valuable reference standard for peptide mapping and mass spectrometry-based identification of alpha-actinin-4. Incorporating this synthetic peptide into analytical workflows allows for precise calibration and validation of peptide mass fingerprints, facilitating unambiguous detection and quantification of the native protein in complex biological samples. This application is particularly relevant for studies focused on post-translational modifications, isoform discrimination, or comparative proteomics, where sequence-specific peptides are essential for robust analytical performance.

Protein-protein interaction studies: The defined sequence of alpha-actinin-4 (118-127) enables targeted investigation of molecular interactions involving the actin-binding domain. Researchers can utilize this peptide in binding assays, pull-down experiments, or surface plasmon resonance analyses to identify and characterize interaction partners that recognize or are modulated by this specific region. Such studies provide critical insight into the molecular determinants of cytoskeletal assembly, focal adhesion dynamics, and the regulation of cell motility, offering a strategic approach to unraveling the functional interfaces of actin-associated proteins.

Antibody epitope characterization: The synthetic peptide corresponding to residues 118-127 is frequently employed as an antigenic determinant for the generation and validation of sequence-specific antibodies against alpha-actinin-4. By serving as a defined epitope, it supports the production of monoclonal or polyclonal antibodies with high specificity, which are instrumental in immunoblotting, immunoprecipitation, and immunofluorescence applications. This approach enhances the selectivity and reliability of immunodetection methods, particularly when distinguishing among closely related alpha-actinin isoforms or evaluating subcellular localization patterns.

Functional assays in cell biology: The 118-127 peptide fragment is used in functional assays to probe the biological significance of this region within the context of actin filament organization and cell morphology. By introducing the peptide into cultured cells or in vitro systems, researchers can assess its impact on actin polymerization, cytoskeletal rearrangement, or cell adhesion properties. These studies help elucidate the mechanistic contributions of specific alpha-actinin-4 domains to cellular dynamics and provide a foundation for the rational design of modulators targeting cytoskeletal regulation.

Peptide-based inhibitor screening: As a structurally defined segment of the alpha-actinin-4 protein, the 118-127 peptide can be incorporated into high-throughput screening platforms to identify small molecules or biologics that disrupt or mimic its interactions. Utilizing this peptide in competitive binding or displacement assays offers a strategic means to discover novel modulators of actin-binding proteins, supporting research in cytoskeletal pharmacology, cell migration, and related signaling pathways. This application is particularly valuable for early-stage drug discovery efforts aimed at targeting protein-protein interactions within the cytoskeletal network.

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