title: Identification of nondisulfided pro alpha 1 (IV) chain produced by cultured B16 melanoma cells.
abstract: Two collagenous polypeptides with apparent molecular weights of 180 and 500 kDa under a nonreducing condition were found to be produced in the culture medium of B16 mouse melanoma cells. Under a reducing condition, the higher molecular weight polypeptide (500 kDa) migrated at an identical position to the 180 kDa polypeptide on sodium dodecyl sulfate-polyacrylamide gel electrophoresis. Both polypeptides were found to have an identical primary structure by V8 protease peptide mapping. Cyanogen bromide cleavage patterns, the fragments produced by pepsin digestion, and partial amino acid sequences of the 180 kDa polypeptide were compatible with those of pro alpha 1 (IV) chain. These results indicate that B16 mouse melanoma cells preferentially produce pro alpha 1 (IV) chains consisting of two forms: disulfide- and nondisulfide-bonded forms.
authors.affiliation: Department of Dermatology, Keio University School of Medicine, Tokyo.
authors.forename: I
authors.initials: I
authors.lastname: Tokimitsu
authors.forename: M
authors.initials: M
authors.lastname: Takehana
authors.forename: H
authors.initials: H
authors.lastname: Hori
authors.forename: Y
authors.initials: Y
authors.lastname: Nagai
authors.forename: S
authors.initials: S
authors.lastname: Tajima
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D003094:Collagen / Q000096:biosynthesis / Q000737:chemistry* / Q000302:isolation & purification*; D004220:Disulfides / Q000737:chemistry; D006801:Humans; D008546:Melanoma, Experimental / Q000378:metabolism*; D008969:Molecular Sequence Data; D010449:Peptide Mapping; D016415:Sequence Alignment; D014407:Tumor Cells, Cultured / Q000378:metabolism
chemical_list: D004220:Disulfides; D003094:Collagen