Crystallization and X-ray analysis of 2-deoxy-scyllo-inosose synthase, the key enzyme in the biosynthesis of 2-deoxystreptamine-containing aminoglycoside antibiotics.

A recombinant 2-deoxy-scyllo-inosose synthase from Bacillus circulans has been crystallized at 277 K using PEG 4000 as precipitant. The diffraction pattern of the crystal extends to 2.30 A resolution at 100 K using synchrotron radiation at the Photon Factory. The crystals are monoclinic and belong to space group P2(1), with unit-cell parameters a = 80.5, b = 70.4, c = 83.0 A, beta = 117.8 degrees. The presence of two molecules per asymmetric unit gives a crystal volume per protein weight (VM) of 2.89 A3 Da(-1) and a solvent constant of 57.4% by volume.