Crystallization and Crystal Packing of Recombinant 3 (or 17) β‐Hydroxysteroid Dehydrogenase from Comamonas testosteroni ATTC 11996

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Abstract
The enzyme 3 (or 17) β‐hydroxysteroid dehydrogenase from Comamonas testosteroni was crystallized. Crystals, of up to 0.6 mm in their longest dimension and suitable for a crystallographic analysis have been obtained by the vapour diffusion method. They belong to the orthorhombic lattice type and diffract to a maximum resolution of 0.23 nm. A final data set obtained by merging data from three crystals resulted in a completeness of 90% with an Rmerge of 6%. A molecular replacement search carried out by using 3α (or 20β)‐hydroxysteroid dehydrogenase from Streptomyces hydrogenans as a search model allowed us to assign I222 as the correct space group and to propose a model for the crystal packing, with one monomer per asymmetric unit. Thus, the whole unit cell contains two tetramers. The R‐factor after rigid body refinement is 48.1 %.