Preparation, Crystallization, and Preliminary X-Ray Diffraction Study of Mutant Carboxypeptidase T Bearing the Primary Specificity Pocket and the Active-Site Loop of Carboxypeptidase B

Crystals of mutant carboxypeptidase T from Thermoactinomyces vulgaris (CPT11QG) with amino-acid substitutions G215S, Q249G, A251G, T257A, D260G, T262D, and L254I and with the insertion ins253T were grown in microgravity by the capillary counter-diffusion method. The crystals belong to sp. gr. P 31, which differs from the space group of the wild-type enzyme ( P 6322). The X-ray diffraction data set was collected from the crystals at the SPring-8 synchrotron facility (Japan) and is suitable for crystal structure determination at 2.45 Å resolution.