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• W1488171851 abstract "We have identified the biological activity of three polypeptides released by limited proteolysis of human plasma fibronectin by leukocyte elastase. A Mr = 140,000 peptide contains cell-spreading activity; a Mr = 60,000 peptide mediates binding to denatured collagen (gelatin), and a Mr = 29,000 peptide contains glutaminyl residues responsible for the transglutaminase (blood coagulation factor XIIIa)-catalyzed incorporation of amines. More extensive proteolysis yielded numerous peptides, including a Mr = 40,000 peptide derived from the Mr = 60,000 peptide which retains gelatin-binding activity. Quantification of the gelatin-binding peptides is consistent with two binding sites per dimeric fibronectin molecule of Mr = 440,000. Both Mr = 60,000 and 40,000 gelatin-binding peptides were enriched with half-cystine residues, containing 28 and 25, respectively, but devoid of cysteine. This, coupled with the electrophoretic behavior of both peptides, was consistent with the presence of intramolecular disulfide bonds in the gelatin-binding domain. Intact fibronectin contains 1 free cysteine residue/monomer, as recently described. This cysteine reacts with 5,5'-dithiobis(2-nitrobenzoic acid) very slowly under nondenaturing conditions but rapidly when fibronectin is denatured. The free cysteine is located in the Mr = 140,000 peptide. While the Mr = 40,000 and 60,000 gelatin-binding peptides bind to gelatin with an affinity about 30-fold and 5-fold less than intact fibronectin (based on a monomeric fibronectin Mr = 220,000), neither gelatin-binding peptide supports spreading of fibronectin-deficient test cells on gelatin or tissue culture plastic substrates. The purified Mr = 140,000 peptide supported cell spreading on plastic, retaining about one-half of the spreading activity of intact fibronectin on a weight basis. These data confirm recent results, suggesting multiple, protease- resistant domains with discrete biological functions within fibronectin. Our results, together with established data, suggest a model for the location of the transglutaminase-reactive glutaminyl residues, gelatin binding, and cell-adhesive domains in fibronectin. The release of univalent, biologically active fibronectin fragments by elastase, a major physiologically released inflammatory protease of human leukocytes, suggests a new potential mechanism for alteration of cell connective tissue interactions at sites of inflammation in vivo." @default.
• W1488171851 created "2016-06-24" @default.
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• W1488171851 date "1980-09-01" @default.
• W1488171851 modified "2023-09-27" @default.
• W1488171851 title "Degradation of fibronectin by human leukocyte elastase. Release of biologically active fragments." @default.
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• W1488171851 doi "https://doi.org/10.1016/s0021-9258(18)43580-6" @default.
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