Preliminary X-ray analysis of a new crystal form of the vanadium-dependent bromoperoxidase from Corallina officinalis

A new crystal form of the vanadium-dependent bromoperoxidase from Corallina officinalis has been obtained. The crystals exhibit a 'teardrop' morphology and are grown from 2 M ammonium dihydrogen phosphate pH 5 and diffract to beyond 1.7 A resolution. They are in tetragonal space group P4(2)22 with unit-cell dimensions of a = b = 201.9, c = 178.19 Angstrom, alpha = beta = gamma = 90 degrees. A 2.3 Angstrom resolution native data set has been collected at the Hamburg Synchrotron. A mercury derivative data set has also been collected, and the heavy-atom positions have been determined. The self-rotation function and the positions of the heavy atoms are consistent with the molecule being a dodecamer with local 23 symmetry.