Crystallization and preliminary X-ray crystallographic analysis of chitosanase from Bacillus circulans MH-K1.
Chitosanase, an enzyme which hydrolyzes chitosan, isolated from Bacillus circulans MH-K1, was crystallized by a vapor-diffusion procedure at 293 K using ammonium sulfate as a precipitant. Rod-shaped colorless crystals, which grew to 0.05 x 0.15 x 1.2 mm within a week, belong to the orthorhombic system and the space group P222(1) or P2(1)2(1)2 with unit-cell dimensions of a = 43.3, b = 57.7, and c = 128.0 A. The asymmetric unit is thought to contain one chitosanase molecule (29 024 Da). The crystals diffract X-rays to at least 2.3 A resolution and are suitable for high-resolution X-ray structure analysis.
Laboratory of Molecular Biology, Division of Bioproduction Science, Faculty of Horticulture, Chiba University, Matsudo, Japan.
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Saito
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Nagata
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Ando
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Kita
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