Identification of nondisulfided proα1(IV) chain produced by cultured B16 melanoma cells

Ichiro Tokimitsu, Makoto Takehana, Hisae Hori, Yutaka Nagai, Shingo Tajima

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


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 proα1(IV) chain. These results indicate that B16 mouse melanoma cells preferentially produce proα1(IV) chains consisting of two forms: disulfide- and nondisulfide-bonded forms.

Original languageEnglish
Pages (from-to)1039-1043
Number of pages5
JournalJournal of biochemistry
Issue number5
Publication statusPublished - 1994 Nov


  • B16 mouse melanoma
  • Type IV collagen

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology


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