title: Membrane-bound human 3beta-hydroxysteroid dehydrogenase: overexpression with His-tag using a baculovirus system and single-step purification.
abstract: The membrane-bound human 3beta-hydroxysteroid dehydrogenase type 1 (3beta-HSD1) was overexpressed with His(6)-tag, using a baculovirus expression system, and then purified by nickel-chelated affinity chromatography. Overexpression of 3beta-HSD1 was confirmed by enzyme assay and Western blot analysis. The protein was purified to more than 95% homogeneity by a single-step Ni(2+)-chelated affinity chromatography after solubilization of the membrane-bound protein with the detergent C(12)E(8). High yield was repeatedly obtained, with 3-4 mg of homogeneous and active 3beta-HSD1 from 1 x 10(9) of infected Sf9 cells. The kinetic study showed a K(m) of 1.7 microM and a V(max) of 50 nmol/min/mg of purified protein using dehydroepiandrosterone as the substrate. The above preparation will facilitate the structure-function study of this important enzyme.
authors.affiliation: Medical Research Council Group in Molecular Endocrinology, CHUL Research Center and Laval University, Quebec, Quebec, G1V 4G2, Canada.
authors.forename: Y W
authors.initials: YW
authors.lastname: Huang
authors.forename: M L
authors.initials: ML
authors.lastname: Lu
authors.forename: H
authors.initials: H
authors.lastname: Qi
authors.forename: S X
authors.initials: SX
authors.lastname: Lin
mesh_terms: D015096:3-Hydroxysteroid Dehydrogenases / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D000818:Animals; D016367:Baculoviridae / Q000235:genetics; D015153:Blotting, Western; D002460:Cell Line; D002846:Chromatography, Affinity; D004591:Electrophoresis, Polyacrylamide Gel; D005822:Genetic Vectors; D006801:Humans; D007527:Isoenzymes / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism; D007700:Kinetics; D008565:Membrane Proteins / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D018411:Spodoptera / Q000166:cytology / Q000821:virology
chemical_list: D007527:Isoenzymes; D008565:Membrane Proteins; D011993:Recombinant Fusion Proteins; D015096:3-Hydroxysteroid Dehydrogenases