Unusual charge stabilization of NADP+ in 17beta-hydroxysteroid dehydrogenase.Mazza, C., Breton, R., Housset, D., Fontecilla-Camps, J.C.
(1998) J.Biol.Chem. 273: 8145-8152
- PubMed: 9525918
- Primary Citation of Related Structures:
- PubMed Abstract:
- Human Type I 17Beta-Hydroxysteroid Dehydrogenase: Site Directed Mutagenesis and X-Ray Crystallography Structure-Function Analysis
(1997) Thesis, Universite Joseph Fourier --: --
- The Structure of a Complex of Human 17Beta-Hydroxysteroid Dehydrogenase with Estradiol and Nadp+ Identifies Two Principal Targets for the Design of Inhibitors
Breton, R.,Housset, D.,Mazza, C.,Fontecilla-Camps, J.C.
(1996) Structure 4: 905
- Structure of Human Estrogenic 17 Beta-Hydroxysteroid Dehydrogenase at 2.20 A Resolution
Ghosh, D.,Pletnev, V.Z.,Zhu, D.W.,Wawrzak, Z.,Duax, W.L.,Pangborn, W.,Labrie, F.,Lin, S.X.
(1995) Structure 3: 503
Type 1 17beta-hydroxysteroid dehydrogenase (17beta-HSD1), a member of the short chain dehydrogenase reductase (SDR) family, is responsible for the synthesis of 17beta-estradiol, the biologically active estrogen involved in the genesis and development ...
Type 1 17beta-hydroxysteroid dehydrogenase (17beta-HSD1), a member of the short chain dehydrogenase reductase (SDR) family, is responsible for the synthesis of 17beta-estradiol, the biologically active estrogen involved in the genesis and development of human breast cancers. Here, we report the crystal structures of the H221L 17beta-HSD1 mutant complexed to NADP+ and estradiol and the H221L mutant/NAD+ and a H221Q mutant/estradiol complexes. These structures provide a complete picture of the NADP+-enzyme interactions involving the flexible 191-199 loop (well ordered in the H221L mutant) and suggest that the hydrophobic residues Phe192-Met193 could facilitate hydride transfer. 17beta-HSD1 appears to be unique among the members of the SDR protein family in that one of the two basic residues involved in the charge compensation of the 2'-phosphate does not belong to the Rossmann-fold motif. The remarkable stabilization of the NADP+ 2'-phosphate by the enzyme also clearly establishes its preference for this cofactor relative to NAD+. Analysis of the catalytic properties of, and estradiol binding to, the two mutants suggests that the His221-steroid O3 hydrogen bond plays an important role in substrate specificity.
Laboratoire de Cristallographie et Cristallogenèse des Protéines, Institut de Biologie Structurale J.-P. Ebel, CEA-CNRS, 41, avenue des Martyrs, F-38027 Grenoble cedex, France.