Cloning, expression, purification, crystallization and preliminary X-ray diffraction analysis of a ferredoxin/flavodoxin-NADP(H) oxidoreductase (Bc0385) fromBacillus cereus

Abstract

Ferredoxin/flavodoxin-NADP(H) oxidoreductases (FNRs) are key enzymes involved in catalysing electron transfer between ferredoxins/flavodoxins and NAD(P)H/NAD(P)+. InBacillus cereusthere are three genes that may encode FNRs, and the Bc0385 FNR has been cloned, overexpressed, purified and successfully crystallized in its NADPH/NADP+-free form. Diffraction data have been collected to 2.5 Å resolution from crystals belonging to the orthorhombic space groupP21212, with unit-cell parametersa= 57.2,b= 164.3,c= 95.0 Å, containing two FNR molecules in the asymmetric unit. The structure of the Bc0385 FNR has been solved by molecular replacement, and is a member of the homodimeric thioredoxin reductase-like class of FNRs.