PRELIMINARY CRYSTALLOGRAPHIC STUDIES OF DIMETHYLSULFOXIDE REDUCTASE FROM RHODOBACTER-CAPSULATUS

Dimethylsulfoxide reductase from the photosynthetic bacterium Rhodobac ter capsulatus has been crystallized in two similar forms which are su itable for X-ray structure determination. Both crystals forms belong t o space group P4(1)22 or P4(3)22, with cell dimensions a = b = 80.81, c = 229.75 Angstrom (type I crystals) or a = b = 89.30, c = 230.05 Ang strom (type II crystals) and one molecule in the asymmetric unit. Diff raction has been observed to at least 2.0 Angstrom, in type I crystals and to 2.6 Angstrom in type II crystals. Dimethylsulfoxide reductase from Rhodobacter is the simplest molybdenum oxotransferase known and t his makes it an ideal model to study the structure and function of thi s class of enzymes.