1J96

Human 3alpha-HSD type 3 in Ternary Complex with NADP and Testosterone


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.25 Å
  • R-Value Free: 0.199 
  • R-Value Work: 0.181 

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This is version 1.3 of the entry. See complete history


Literature

Structure of the human 3alpha-hydroxysteroid dehydrogenase type 3 in complex with testosterone and NADP at 1.25-A resolution.

Nahoum, V.Gangloff, A.Legrand, P.Zhu, D.W.Cantin, L.Zhorov, B.S.Luu-The, V.Labrie, F.Breton, R.Lin, S.X.

(2001) J Biol Chem 276: 42091-42098

  • DOI: https://doi.org/10.1074/jbc.M105610200
  • Primary Citation of Related Structures:  
    1J96

  • PubMed Abstract: 

    The first crystallographic structure of human type 3 3alpha-hydroxysteroid dehydrogenase (3alpha-HSD3, AKR1C2), an enzyme playing a critical role in steroid hormone metabolism, has been determined in complex with testosterone and NADP at 1.25-A resolution. The enzyme's 17beta-HSD activity was studied in comparison with its 3alpha-HSD activity. The enzyme catalyzes the inactivation of dihydrotestosterone into 5alpha-androstane-3alpha,17beta-diol (3alpha-diol) as well as the transformation of androstenedione into testosterone. Using our homogeneous and highly active enzyme preparation, we have obtained 150-fold higher 3alpha-HSD specificity as compared with the former reports in the literature. Although the rat and the human 3alpha-HSDs share 81% sequence homology, our structure reveals significantly different geometries of the active sites. Substitution of the Ser(222) by a histidine in the human enzyme may compel the steroid to adopt a different binding to that previously described for the rat (Bennett, M. J., Albert, R. H., Jez, J. M., Ma, H., Penning, T. M., and Lewis, M. (1997) Structure 5, 799-T812). Furthermore, we showed that the affinity for the cofactor is higher in the human 3alpha-HSD3 than the rat enzyme due to the presence of additional hydrogen bonds on the adenine moiety and that the cofactor is present under its reduced form in the active site in our preparation.


  • Organizational Affiliation

    Oncology and Molecular Endocrinology Research Center, Laval University Medical Center, Québec, Québec G1V 4G2, Canada.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
3alpha-hydroxysteroid dehydrogenase type 3
A, B
323Homo sapiensMutation(s): 0 
EC: 1.1.1.213
UniProt & NIH Common Fund Data Resources
Find proteins for P52895 (Homo sapiens)
Explore P52895 
Go to UniProtKB:  P52895
PHAROS:  P52895
GTEx:  ENSG00000151632 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP52895
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.25 Å
  • R-Value Free: 0.199 
  • R-Value Work: 0.181 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 55.072α = 90
b = 87.148β = 107.36
c = 76.877γ = 90
Software Package:
Software NamePurpose
EPMRphasing
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-05-23
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-08-16
    Changes: Data collection, Database references, Derived calculations, Refinement description