title: Isolation and structure of the amino-terminal cross-linking region in insoluble type III collagen.
abstract: A collagenous peptide T1X was isolated from a tryptic digest of the insoluble matrix of calf skin. The peptide consists of two identical polypeptide chains each with a length of 72 amino acid residues joined by a cross-link. Absorption spectra obtained from hydrazone and azine derivatives of T1X indicated that the peptide contains an aldol-type of cross-link (X). The sequence of 23 amino acid residues in the amino-terminal region was determined as Glx-Tyr-Glu-Ala-Tyr-Asp-Val-X-Ser-Gly-Val-Ala-Gly-Gly-Gly-Ile-Ala-Gly-Tyr-Hyp-Gly-Pro-Ala. This sequence overlaps the previously described amino-terminal sequence of alpha1 (III) chain obtained from pepsin treated, insoluble type III collagen. Thus, the present data demonstrate a nonhelical segment of 14 amino acid residues in type III collagen important for cross-linking.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D002417:Cattle; D003094:Collagen / Q000032:analysis* / Q000302:isolation & purification; D006868:Hydrolysis; D010434:Pepsin A; D010443:Peptide Chain Termination, Translational
chemical_list: D003094:Collagen; D010434:Pepsin A