Crystallization and preliminary X-ray diffraction studies of the catalytic domain of a novel chitinase, a member of GH family 23, from the moderately thermophilic bacterium Ralstonia sp. A-471

Chitinase from the moderately thermophilic bacterium Ralstonia sp. A-471 (Ra-ChiC) is divided into two domains: a chitin-binding domain (residues 36-80) and a catalytic domain (residues 103-252). Although the catalytic domain of Ra-ChiC has homology to goose-type lysozyme, Ra-ChiC does not show lysozyme activity but does show chitinase activity. The catalytic domain with part of an interdomain loop (Ra-ChiC_89-252) was crystallized under several different conditions using polyethylene glycol as a precipitant. The crystals diffracted to 1.85 Å resolution and belonged to space group P6₁22 or P6₅22, with unit-cell parameters a = b = 100, c = 243 Å. The calculated Matthews coefficient was approximately 3.2, 2.4 or 1.9 Å³ Da^-1 assuming the presence of three, four or five Ra-ChiC_89-252 molecules in the asymmetric unit, respectively.