1q13

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{{STRUCTURE_1q13| PDB=1q13 | SCENE= }}
{{STRUCTURE_1q13| PDB=1q13 | SCENE= }}
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'''Crystal structure of rabbit 20alpha hyroxysteroid dehydrogenase in ternary complex with NADP and testosterone'''
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===Crystal structure of rabbit 20alpha hyroxysteroid dehydrogenase in ternary complex with NADP and testosterone===
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==Overview==
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The aldo-keto reductase rabbit 20alpha-hydroxysteroid dehydrogenase (rb20alpha-HSD; AKR1C5) is less selective than other HSDs, since it exerts its activity both on androgens (C19 steroids) and progestins (C21 steroids). In order to identify the molecular determinants responsible for this reduced selectivity, binary (NADPH) and ternary (NADP(+)/testosterone) complex structures were solved to 1.32A and 2.08A resolution, respectively. Inspection of the cofactor-binding cavity led to the identification of a new interaction between side-chains of residues His222 and Lys270, which cover the central phosphate chain of the cofactor, reminiscent of the "safety-belt" found in other aldo-keto reductases. Testosterone is stabilized by a phenol/benzene tunnel composed of side-chains of numerous residues, among which Phe54, which forces the steroid to take up an orientation markedly contrasting with that found in HSD ternary complexes reported. Combining structural, site-directed mutagenesis, kinetic and fluorescence titration studies, we found that the selectivity of rb20alpha-HSD is mediated by (i) the relaxation of loop B (residues 223-230), partly controlled by the nature of residue 230, (ii) the nature of the residue found at position 54, and (iii) the residues found in the C-terminal tail of the protein especially the side-chain of the amino acid 306.
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(as it appears on PubMed at http://www.pubmed.gov), where 15123423 is the PubMed ID number.
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{{ABSTRACT_PUBMED_15123423}}
==About this Structure==
==About this Structure==
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[[Category: Testosterone]]
[[Category: Testosterone]]
[[Category: Tim-barrel]]
[[Category: Tim-barrel]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 05:44:14 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 11:42:59 2008''

Revision as of 08:43, 28 July 2008

Image:1q13.png

Template:STRUCTURE 1q13

Crystal structure of rabbit 20alpha hyroxysteroid dehydrogenase in ternary complex with NADP and testosterone

Template:ABSTRACT PUBMED 15123423

About this Structure

1Q13 is a Single protein structure of sequence from Oryctolagus cuniculus. Full crystallographic information is available from OCA.

Reference

Loop relaxation, a mechanism that explains the reduced specificity of rabbit 20alpha-hydroxysteroid dehydrogenase, a member of the aldo-keto reductase superfamily., Couture JF, Legrand P, Cantin L, Labrie F, Luu-The V, Breton R, J Mol Biol. 2004 May 21;339(1):89-102. PMID:15123423

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