Fig. 2.

Domain features of F. tularensis (A1a, A1b, A2, and type B) and F. novicida chitinases. The relative positions of conserved domains were identified in the chitinase gene products of F. tularensis and F. novicida. Solid black boxes indicate the predicted signal peptide cleavage site, striped boxes indicate the location and completeness of the GH18 domain (truncated GH18 domains appear as a pentagon), open boxes indicate the position of fibronectin type 3 domains, gray boxes indicate carbohydrate binding domains, and dark gray chevrons represent incomplete N-acetylglucosamine-binding protein A domains. (A) chiA gene products; (B) chiB gene products; (C) chiC gene products; (D) chiD gene products. A similar chiC gene product was identified in the genome of F. novicida GA99-3548 and GA99-3549 but not F. novicida GA99-3550.