Experimental Data Snapshot

  • Resolution: 2.20 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.185 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


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: 503-513

  • DOI: https://doi.org/10.1016/s0969-2126(01)00183-6
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    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. 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. 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.

  • Organizational Affiliation

    Hauptman-Woodward Medical Research Institute, Inc., Buffalo, NY 14203, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
UniProt & NIH Common Fund Data Resources
Find proteins for P14061 (Homo sapiens)
Explore P14061 
Go to UniProtKB:  P14061
PHAROS:  P14061
GTEx:  ENSG00000108786 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP14061
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.20 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.185 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 123.56α = 90
b = 45.05β = 99.02
c = 61.33γ = 90
Software Package:
Software NamePurpose
RIGAKUdata reduction

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

  • Released Date: 1996-12-07 
  • Deposition Author(s): Ghosh, D.

Revision History  (Full details and data files)

  • Version 1.0: 1996-12-07
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2024-02-07
    Changes: Data collection, Database references, Other