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Abstract
The substrate spectrum of the tandem collagen-binding domain (CBD) of Clostridium histolyticum class I collagenase (Co1G) was examined both in vitro and in vivo. CBD bound to insoluble type I, II, III and IV collagens in vitro, and to skin, aorta, tendon, kidney. trachea and corneal tissues containing various types of collagen fibrils or sheets. CBD hound to all kinds of collagen fibrils regardless of their diameters and also bound to sheet-forming collagen in the glomerular basal lamina or Descemet's membrane of the cornea. This wide substrate spectrum expands possible applications of the drug delivery system we proposed previously (PNAS 95:7018-7023, 1998). Therapeutic agents fused with CBD will hind not only to subcutaneous tissues, but also to other tissues containing non-type I collagen.