PMID: 1337Nov 1, 1975

Isolation and characterization of pepsin-treated type III collagen from calf skin

Hoppe-Seyler's Zeitschrift für physiologische Chemie
T Fujii, K Kühn

Abstract

Calf skin collagen was solubilized by incubating acid-extracted calf skin with pepsin at pH 2.0 and 25 degrees C, conditions that did not cause degradation of the triple helical region of collagen. Type III collagen was separated from type I collagen by differential salt precipitation at pH 7.5. The isolated type III collagen contained mainly gamma and higher molecular weight components cross-linked by reducible and/or non-reducible bonds. The isolated alpha1 (III) chains had an amino acid composition characteristic of type III collagen. Denatured but unreduced type III collagen, chromatographed on carboxymethyl-cellulose, eluted in the alpha 2 region, while after reduction and alkylation the alpha1 (III) chains eluted between the positions of alpha1 (I) and alpha2. The mid-point melting temperature temperature (tm) of type III collagen (35.1 degrees C) in a citrate buffer at pH 3.7 was somewhat lower than that of type I collagen (35.9 degrees C). Renaturation experiments at 25 degrees C showed that denatured type III collagen molecules with intact intramolecular disulfide bridges (gamma components) reform the triple helical structure of collagen much faster than reduced and carboxymethylated alpha1 (III) chains.

Citations

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Related Concepts

Bos indicus
Zyderm
Disulfides
Hydrogen-Ion Concentration
Electron Microscopy
Pepsin 3
Plasma Protein Binding Capacity
Protein Conformation
Protein Denaturation
Skin

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