| Literature DB >> 22102045 |
Niels van Oosterwijk1, Jan Knol, Lubbert Dijkhuizen, Robert van der Geize, Bauke W Dijkstra.
Abstract
3-Ketosteroid dehydrogenases are flavoproteins which play key roles in steroid ring degradation. The enzymes are abundantly present in actinobacteria, including the catabolic powerhouse Rhodococcus jostii and the pathogenic species R. equi and Mycobacterium tuberculosis. The gene for 3-ketosteroid Δ(4)-(5α)-dehydrogenase [Δ(4)-(5α)-KSTD] from R. jostii RHA1 was cloned and overexpressed in Escherichia coli. His-tagged Δ(4)-(5α)-KSTD enzyme was purified by Ni(2+)-NTA affinity chromatography, anion-exchange chromatography and size-exclusion chromatography and was crystallized using the hanging-drop vapour-diffusion method. Seeding greatly improved the number of crystals obtained. The crystals belonged to space group C222(1), with unit-cell parameters a = 99.2, b = 114.3, c = 110.2 Å. Data were collected to a resolution of 1.6 Å.Entities:
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Year: 2011 PMID: 22102045 PMCID: PMC3212380 DOI: 10.1107/S1744309111028727
Source DB: PubMed Journal: Acta Crystallogr Sect F Struct Biol Cryst Commun ISSN: 1744-3091