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Structure of collagenase G reveals a chew and digest mechanism of bacterial collagenolysis

Authors
Journal
Nature Structural & Molecular Biology
1545-9993
Publisher
Nature Publishing Group
Publication Date
Volume
18
Issue
10
Identifiers
DOI: 10.1038/nsmb.2127
Keywords
  • Article
Disciplines
  • Biology
  • Medicine

Abstract

Collagen constitutes one third of the body protein in humans, reflecting its extraordinary role in health and disease. Of similar importance, therefore, are the idiosyncratic proteases that nature evolved for collagen remodeling. Intriguingly, the most efficient collagenases are those that enable clostridial bacteria to colonize their host tissues, but despite intense studies, the structural and mechanistic basis of these enzymes has remained elusive. Here we present the crystal structure of collagenase G from Clostridium histolyticum at 2.55 Å resolution. By combining the structural data with enzymatic and mutagenesis studies, we derive a conformational two-state model of bacterial collagenolysis, in which the recognition and unraveling of collagen microfibrils into triple helices as well as the unwinding of the latter go hand in hand with collagenase opening and closing.

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