Abstract
The class I and IIClostridium histolyticum collagenases (CHC) have been used to identify hyperreactive sites in rat type I, bovine type II, and human type III collagens. The class I CHC attack both collagens at loci concentrated in the N-terminal half of these collagens starting with the site closest to the N-terminus. The class II CHC initiate collagenolysis by attacking both collagens in the interior to produce a mixture of C-terminal 62,000 and a N-terminal 36,000 fragments. Both fragments are next shortened by removal of a 3000 fragment. These results are very similar to those reported earlier for the hydrolysis of rat type I collagen by these CHC, indicating that the three collagens share many hyperreactive sites. Similar reactions carried out with the respective gelatins show that they are cleaved at many sites at approximately the same rate. Thus, the hyperreactivity of the sites identified must be attributed to their environment in the native collagens. N-terminal sequencing of the fragments produced in these reactions has allowed the identification of 16 cleavage sites in the α1(I), α2(I), α1(II), and α1(III) collagen chains. An analysis of the triple helical stabilities of these cleavage site regions as reflected by their imino acid contents fails to yield a correlation between reactivity and triple helical stability. The existence of these hyperreactive CHC cleavage sites suggests that type I, II, and III collagens contain regions that have specific nontriple helical conformations. The sequence of these sites presented here now makes it possible to investigate these conformations by computational and peptide mimetic techniques.
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French, M.F., Bhown, A. & Van Wart, H.E. Identification ofClostridium histolyticum collagenase hyperreactive sites in type I, II, and III collagens: Lack of correlation with local triple helical stability. J Protein Chem 11, 83–97 (1992). https://doi.org/10.1007/BF01025095
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DOI: https://doi.org/10.1007/BF01025095