Alignment of biologically active domains in the fibronectin molecule.

Gelatin-binding material was isolated from a human plasma cryoprecipitate by affinity chromatography on gelatin-Sepharose. Individual fragments of fibronectin with Mr = 170,000, 100,000, and 80,000 and a mixture of fragments with Mr = 205,000 and 190,000 (200K fraction) were isolated from this material. These fragments reacted with antifibronectin and with antibodies to a gelatin-binding Mr = 70,000 tryptic fragment of fibronectin. They all shared the same NH2-terminal amino acid sequence. The 205K and 190K fragments bound also to heparin-Sepharose, whereas the smaller fragments did not. The 200K fraction and the 170K fragment mediated cell attachment when used to coat plastic, whereas the 100K and 80K fragments were inactive in this assay. Further digestion of the 205K and 190K fragments with chymotrypsin yielded separate sets of smaller fragments that bound to either gelatin-Sepharose or heparin-Sepharose, as well as fragments that did not show either of these binding activities but mediated cell attachment. Since the NH2-terminal ends of the 205K, 190K, 100K, and 80K fragments are the same, the results define the order of the active sites in the fibronectin molecule as gelatin-binding site, cell attachment site, and heparin-binding site.

• Publication year

  1981

• Venue

  Journal of Biological Chemistry

• Publication date

  1981-07-25

• Fields of study

  Biology, Medicine, Chemistry

• Identifiers
  DOI 10.1016/s0021-9258(19)68958-1PMID 6788765
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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