Crystallization and preliminary X‐ray analysis of the reduced Rieske‐type [2Fe–2S] ferredoxin derived from Pseudomonas sp. strain KKS102

The reduced form of BphA3, a Rieske‐type [2Fe–2S] ferredoxin component of the biphenyl dioxygenase BphA from Pseudomonas sp. strain KKS102, was crystallized by the sitting‐drop vapour‐diffusion method under anaerobic conditions. The crystal belongs to space group P 3 1 21, with unit‐cell parameters a = b = 49.6, c = 171.9 Å, and diffracts to a resolution of 1.95 Å. A molecular‐replacement calculation using oxidized BphA3 as a search model yielded a satisfactory solution.