Preliminary X-ray data for a D-amino acid amino-transferase from a novel thermophilic Bacillus

Abstract Crystals of the d -amino acid aminotransferase (D-ATA) from a novel thermophilic Bacillus species ( Escherichia coli pICT113 cloned gene product) have been examined by X-ray analysis. The crystals grow as hexagonal prisms, with the symmetry of space group P 6 1 or P 6 5 (indistinguishable crystallographically). The cell dimensions are a = b = 135 A , c = 53 A , α = β = 90 °, and γ = 120 ° . The unit cell has a volume of 850,000 A 3 with six asymmetric units per unit cell. There is one dimer of molecular weight 62,000 per asymmetric unit, and the crystals diffract to 2.7 A.