Crystallization and preliminary X-ray analysis of the tungsten-dependent acetylene hydratase from Pelobacter acetylenicus

Acetylene hydratase is a tungsten-containing hydroxylase that converts acetylene to acetaldehyde in a unique reaction that requires a strong reductant. The subsequent disproportionation of acetaldehyde yields acetate and ethanol. Crystals of the tungsten/iron-sulfur protein acetylene hydratase from Pelobacter acetylenicus strain WoAcy 1 (DSM 3246) were grown by the vapour-diffusion method in an N2/H2 atmosphere using polyethylene glycol as precipitant. Growth of crystals suitable for X-ray analysis strictly depended on the presence of Ti(III) citrate or dithionite as reducing agents.

Crystallization and preliminary X-ray analysis of the molybdenum-dependent pyrogallol-phloroglucinol transhydroxylase of Pelobacter acidigallici

Crystals of the molybdo-/iron-sulfur protein pyrogallol:phloroglucinol hydroxyltransferase (transhydroxylase; EC 1.97.1.2) from Pelobacter acidigallici were grown by vapour diffusion in an N(2)/H(2) atmosphere using polyethylene glycol as a precipitant. In this microorganism, transhydroxylase converts pyrogallol to phloroglucinol in a unique reaction without oxygen transfer from water. Growth of crystals suitable for X-ray analysis was strongly dependent on the presence of dithionite as a reducing agent. The crystals belonged to space group P1 and MAD data were collected on the iron K edge to resolutions higher than 2.5 A.