Collagen alpha-4(IV) chain
Type IV collagen alpha 4 chain (170-177) is a synthetic peptide fragment corresponding to amino acid residues 170 to 177 of the alpha 4 chain of type IV collagen, a critical structural component of basement membranes in vertebrate tissues. As a defined peptide sequence derived from a highly conserved region of type IV collagen, it serves as a valuable biochemical tool for investigating the molecular architecture and biological functions of extracellular matrix proteins. The sequence-specific nature of this peptide enables researchers to dissect the roles of distinct collagen domains in cellular adhesion, signaling, and matrix assembly, making it highly relevant for studies in cell biology, tissue engineering, and matrix pathology.
Peptide mapping: In proteomics and structural biology, this peptide is frequently utilized as a reference standard or probe for peptide mapping experiments. Its defined sequence allows for the calibration and validation of mass spectrometry-based workflows aimed at characterizing type IV collagen isoforms or assessing post-translational modifications. By serving as a model fragment, it enables precise identification and quantification of collagen-derived peptides in complex biological samples, supporting detailed analysis of extracellular matrix remodeling events.
Cell adhesion studies: The peptide fragment provides a targeted approach for elucidating the mechanisms of cell-matrix interactions. When immobilized on substrates or incorporated into biomimetic surfaces, it can be used to assess the adhesive properties of specific cell types, such as epithelial or endothelial cells, that interact with type IV collagen in vivo. Such studies contribute to a deeper understanding of integrin-mediated adhesion, signaling cascades, and the influence of extracellular matrix composition on cell behavior, which are fundamental to developmental biology and tissue regeneration research.
Antibody epitope mapping: The sequence corresponding to residues 170-177 of the alpha 4 chain serves as an effective antigenic determinant for generating or characterizing antibodies specific to type IV collagen. By employing this peptide in immunoassays or competitive binding experiments, researchers can delineate antibody binding sites, evaluate cross-reactivity among collagen isoforms, and support the development of highly specific immunoreagents for analytical or diagnostic applications in basic research.
Matrix-protein interaction analysis: The defined peptide sequence is instrumental in probing protein-protein interactions within the extracellular matrix. It can be used to identify binding partners of the alpha 4 chain or to investigate the specificity of interactions with matrix-associated enzymes, growth factors, or structural proteins. Such studies help clarify the molecular mechanisms underlying matrix assembly, stability, and remodeling, offering insights into processes such as basement membrane formation and pathological matrix alterations.
Peptide-based biomaterials research: The incorporation of this peptide fragment into synthetic scaffolds or hydrogels enables the design of advanced biomaterials that recapitulate key features of the native extracellular matrix. By modulating peptide presentation and density, researchers can investigate the effects on cell attachment, proliferation, and differentiation, informing the rational design of substrates for tissue engineering, regenerative medicine, and in vitro cell culture systems. The use of sequence-defined collagen-derived peptides thus provides a powerful strategy for tuning the bioactivity and performance of engineered biomaterials.
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