Type-I procollagen, 14C-biosynthetically labelled, was reduced under denaturing and non-denaturing conditions. Reoxidation to disulphide-linked trimers occurred with non-denatured chains in the presence of an oxidant system containing oxidized and reduced glutathione. Dimeric intermediates were not detected. This reoxidation was accelerated by homogeneous beef liver protein disulphide-isomerase.

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