title: Molecular cloning and expression of progesterone 5beta-reductase (5beta-POR) from Isoplexis canariensis.
abstract: A full-length cDNA clone that encodes progesterone 5beta-reductase (5beta-POR, EC 1.3.1.3) was isolated from ISOPLEXIS CANARIENSIS leaves. The reading frame of the IC5beta-POR gene is 1170 nucleotides corresponding to 389 amino acids. The SPHI /SALI IC5beta-POR fragment was cloned into the pQE vector system and then transformed into ESCHERICHIA COLI strain M15[pREP4]. The gene was functionally expressed and the recombinant enzyme was characterised. K(m) and V(max) were calculated to be 0.215 mM and 46.4 nkat/mg protein, respectively, using progesterone as the substrate. Kinetic constants for cortisol, cortexone, 4-androstene-3,17-dione and NADPH were also determined. The 5beta-POR from I. CANARIENSIS shows a significant homology to the putative progesterone 5beta-reductases isolated from other plant species, such as DIGITALIS LANATA and ARABIDOPSIS THALIANA.
authors.affiliation: Lehrstuhl für Pharmazeutische Biologie, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany.
authors.forename: Vanessa
authors.initials: V
authors.lastname: Herl
authors.forename: Gabriele
authors.initials: G
authors.lastname: Fischer
authors.forename: Ralf
authors.initials: R
authors.lastname: Bötsch
authors.forename: Frieder
authors.initials: F
authors.lastname: Müller-Uri
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Kreis
mesh_terms: D003001:Cloning, Molecular; D015870:Gene Expression; D008969:Molecular Sequence Data; D010088:Oxidoreductases / Q000235:genetics / Q000378:metabolism*; D028083:Scrophulariaceae / Q000201:enzymology* / Q000235:genetics
chemical_list: D010088:Oxidoreductases; C090493:progesterone 5 beta-reductase