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1qyx

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{{STRUCTURE_1qyx| PDB=1qyx | SCENE= }}
{{STRUCTURE_1qyx| PDB=1qyx | SCENE= }}
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'''Crystal structure of human estrogenic 17beta-hydroxysteroid dehydrogenase complex with androstenedione and NADP'''
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===Crystal structure of human estrogenic 17beta-hydroxysteroid dehydrogenase complex with androstenedione and NADP===
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==Overview==
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Human estrogenic 17beta-hydroxysteroid dehydrogenase (17beta-HSD1), a member of the short chain dehydrogenase/reductase (SDR) family, is responsible for the biosynthesis of all active estrogens. The crystal structures of two C19-steroid ternary complexes (17beta-HSD1-androstanedione-NADP and 17beta-HSD1-androstenedione-NADP) reveal the critical role of Leu149 in regulating the substrate specificity and provide novel insight into the different fates of a conserved glutamate residue in the estrogen-specific proteins upon the binding of the keto and hydroxyl groups of steroids. The whole NADP molecule can be unambiguously defined in the NADP binary complex, whereas both ternary complexes show that the nicotinamide moiety of NADP cannot be located in the density maps. In both ternary complexes, the expected position of carboxamide oxygen of NADP is occupied by a water molecule, which makes a bifurcated hydrogen bond with the O3 of C19-steroid and the main chain nitrogen of Val188. These results demonstrate that the hydrogen bonding interaction between the main chain amide group and the carboxamide group of NAD(P)(H) plays an important role in anchoring the nicotinamide ring to the enzyme. This finding is substantiated by structural analyses of all 33 NAD(P)(H) complexes of different SDR proteins, because 29 structures of 33 show this interaction. This common feature reveals a general mechanism among the SDR family, providing a rational basis for inhibitor design against biologically relevant SDR targets.
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(as it appears on PubMed at http://www.pubmed.gov), where 14966133 is the PubMed ID number.
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{{ABSTRACT_PUBMED_14966133}}
==About this Structure==
==About this Structure==
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[[Category: C19-steroid]]
[[Category: C19-steroid]]
[[Category: Nadp binding]]
[[Category: Nadp binding]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 06:52:20 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 00:35:23 2008''

Revision as of 21:35, 27 July 2008

Image:1qyx.png

Template:STRUCTURE 1qyx

Crystal structure of human estrogenic 17beta-hydroxysteroid dehydrogenase complex with androstenedione and NADP

Template:ABSTRACT PUBMED 14966133

About this Structure

1QYX is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Cofactor hydrogen bonding onto the protein main chain is conserved in the short chain dehydrogenase/reductase family and contributes to nicotinamide orientation., Shi R, Lin SX, J Biol Chem. 2004 Apr 16;279(16):16778-85. Epub 2004 Feb 13. PMID:14966133

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