View source for 1bhs


==HUMAN ESTROGENIC 17BETA-HYDROXYSTEROID DEHYDROGENASE==
<StructureSection load='1bhs' size='340' side='right'caption='[[1bhs]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1bhs]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1BHS OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1BHS FirstGlance]. <br>
</td></tr><tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/17-beta-estradiol_17-dehydrogenase 17-beta-estradiol 17-dehydrogenase], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.1.1.62 1.1.1.62] </span></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1bhs FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1bhs OCA], [https://pdbe.org/1bhs PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1bhs RCSB], [https://www.ebi.ac.uk/pdbsum/1bhs PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1bhs ProSAT]</span></td></tr>
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== Function ==
[[https://www.uniprot.org/uniprot/DHB1_HUMAN DHB1_HUMAN]] Favors the reduction of estrogens and androgens. Also has 20-alpha-HSD activity. Uses preferentially NADH. 
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
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    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
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</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1bhs ConSurf].
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== Publication Abstract from PubMed ==
BACKGROUND: The principal human estrogen, 17 beta-estradiol, is a potent stimulator of certain endocrine-dependent forms of breast cancer. Because human estrogenic 17 beta-hydroxysteroid dehydrogenase (type I 17 beta-HSD) catalyzes the last step in the biosynthesis of 17 beta-estradiol from the less potent estrogen, estrone, it is an attractive target for the design of inhibitors of estrogen production and tumor growth. This human enzyme shares less than 15% sequence identity with a bacterial 3 alpha,20 beta-HSD, for which the three-dimensional structure is known. The amino acid sequence of 17 beta-HSD also differs from that of bacterial 3 alpha,20 beta-HSD by two insertions (of 11 and 14 residues) and 52 additional residues at the C terminus. RESULTS: The 2.20 A resolution structure of type I 17 beta-HSD, the first mammalian steroidogenic enzyme studied by X-ray crystallographic techniques, reveals a fold characteristic of the short-chain dehydrogenases. The active site contains a Tyr-X-X-X-Lys sequence (where X is any amino acid) and a serine residue, features that are conserved in short-chain steroid dehydrogenases. The structure also contains three alpha-helices and a helix-turn-helix motif, not observed in short-chain dehydrogenase structures reported previously. No cofactor density could be located. CONCLUSIONS: The helices present in 17 beta-HSD that were not in the two previous short-chain dehydrogenase structures are located at one end of the substrate-binding cleft away from the catalytic triad. These helices restrict access to the active site and appear to influence substrate specificity. Modeling the position of estradiol in the active site suggests that a histidine side chain may play a critical role in substrate recognition. One or more of these helices may also be involved in the reported association of the enzyme with membranes. A model for steroid and cofactor binding as well as for the estrone to estradiol transition state is proposed. The structure of the active site provides a rational basis for designing more specific inhibitors of this breast cancer associated enzyme.

Structure of human estrogenic 17 beta-hydroxysteroid dehydrogenase at 2.20 A resolution.,Ghosh D, Pletnev VZ, Zhu DW, Wawrzak Z, Duax WL, Pangborn W, Labrie F, Lin SX Structure. 1995 May 15;3(5):503-13. PMID:7663947<ref>PMID:7663947</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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==See Also==
*[[Hydroxysteroid dehydrogenase 3D structures|Hydroxysteroid dehydrogenase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: 17-beta-estradiol 17-dehydrogenase]]
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Ghosh, D]]
[[Category: Estrogen]]
[[Category: Human placental 17beta-hsd]]
[[Category: Human type i 17beta-hsd]]
[[Category: Oxidoreductase]]
[[Category: Short-chain dehydrogenase]]
[[Category: Steroid dehydrogenase]]