FIG. 2.

M. degradans strain 2-40 chitinases contain polyserine linkers and glutamic acid-rich domains, as well as conserved modules found in other microbial chitinases. Protein sequence analysis revealed the presence of the following elements: putative type II secretion signals; GH18, GH20, and GH3 domains; chitin- and carbohydrate-binding domains; PKD domains; and regions of amino acid repeats. Type II secretion signal (black boxes), polyserine linker (SSS), chitin-binding domain (cross-hatched boxes), glutamic acid-rich domain (grey shaded boxes), PKD domain (boxes with horizontal lines), and soluble sugar-binding domain (hatched boxes) are indicated.