The categories and functions of the domains in typical collagenolytic proteases.
Domain | Function |
---|---|
CD | It is responsible for the enzymatic activity of the collagenase and contains the active site where the cleavage of collagen molecules occurs [19]. |
CBD | It facilitates the binding of the enzyme to collagen substrates, enhancing the efficiency of collagen degradation by bringing the enzyme into close proximity to its target [19]. |
PKD/PPC | PKD and PPC domains belong to Immunoglobulin-like (Ig-like) beta-sandwich protein. These domains can swell insoluble collagen and release collagen fiber, which is more easily degraded by collagenases [20]. |
AD | It mediates the initial recognition of soluble collagen and unwinds collagen locally, transiently, and reversibly [91]. |
PA | It has collagen-binding ability [92]. |
βJR | It is referred to as the 'P-domain' and is essential for cleaving the N-terminal pro-domain [21]. It participates in enzyme folding and stability, collagen binding, and collagenolytic activity [17]. It is required for the hyperthermostability of protease [17, 73]. |
P | P-proprotein convertase domain is necessary to keep the protease structure stable [20]. |