Abstract
Crystals of Thermoactinomyces vulgaris R-47 a-amylase I, hydrolyzing cyclodextrins and pullulan, were grown by the vapor diffusion methods in two crystal forms with minor variations. The diffraction data were collected up to 2.5 A resolution and both crystals were belong to monoclinic system and a space group of C2 with cell dimensions ofa = 123.6 A, b = 51.7 A, and c = 109.1 A , 13 = 104.2° (crystal form 1) and a= 122.5 A, b = 55.0 A, and c = 108.7 A,13 = 103.8° (crystal form 2).