Primary Citation of Related Structures: 1FDU, 1FDV, 1FDW
PubMed Abstract:
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 ...
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.
Related Citations:
Human Type I 17Beta-Hydroxysteroid Dehydrogenase: Site Directed Mutagenesis and X-Ray Crystallography Structure-Function Analysis Mazza, C. (1997) Thesis --: --
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
Organizational Affiliation:
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.
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