1HDC

MECHANISM OF INHIBITION OF 3ALPHA,20BETA-HYDROXYSTEROID DEHYDROGENASE BY A LICORICE-DERIVED STEROIDAL INHIBITOR


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Work: 0.194 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Mechanism of inhibition of 3 alpha, 20 beta-hydroxysteroid dehydrogenase by a licorice-derived steroidal inhibitor.

Ghosh, D.Erman, M.Wawrzak, Z.Duax, W.L.Pangborn, W.

(1994) Structure 2: 973-980

  • DOI: https://doi.org/10.1016/s0969-2126(94)00099-9
  • Primary Citation of Related Structures:  
    1HDC

  • PubMed Abstract: 

    Bacterial 3 alpha, 20 beta-hydroxysteroid dehydrogenase (3 alpha, 20 beta-HSD) reversibly oxidizes the 3 alpha and 20 beta hydroxyl groups of androstanes and pregnanes and uses nicotinamide adenine dinucleotide as a cofactor. 3 alpha, 20 beta-HSD belongs to a family of short-chain dehydrogenases that has a highly conserved Tyr-X-X-X-Lys sequence. The family includes mammalian enzymes involved in hypertension, digestion, fertility and spermatogenesis. Several members of the enzyme family, including 3 alpha, 20 beta-HSD, are competitively inhibited by glycyrrhizic acid, a steroidal compound found in licorice, and its derivative, carbenoxolone, an anti-inflammatory glucocorticoid. The three-dimensional structure of the enzyme-carbenoxolone complex has been determined and refined at 2.2 A resolution to a crystallographic R-factor of 19.4%. The hemisuccinate side chain of carbenoxolone makes a hydrogen bond with the hydroxyl group of the conserved residue Tyr152 and occupies the position of the nicotinamide ring of the cofactor. The occupancies of the inhibitor in four independent catalytic sites refine to 100%, 95%, 54% and 36%. The steroid binds at the catalytic site in a mode much like the previously proposed mode of binding of the substrate cortisone. No bound cofactor molecules were found. The varying occupancy of steroid molecules observed in the four catalytic sites is either due to packing differences or indicates a cooperative effect among the four sites. The observed binding accounts for the inhibition of 3 alpha, 20 beta-HSD.


  • Organizational Affiliation

    Hauptman-Woodward Medical Research Institute, Buffalo, NY 14203-1196.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
3-ALPHA, 20 BETA-HYDROXYSTEROID DEHYDROGENASE
A, B, C, D
254Streptomyces exfoliatusMutation(s): 0 
EC: 1.1.1.53
UniProt
Find proteins for P19992 (Streptomyces exfoliatus)
Explore P19992 
Go to UniProtKB:  P19992
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP19992
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Work: 0.194 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 72.05α = 101.78
b = 60.04β = 104.41
c = 59.84γ = 96.31

Structure Validation

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Entry History 

Deposition Data

  • Released Date: 1995-02-07 
  • Deposition Author(s): Ghosh, D.

Revision History  (Full details and data files)

  • Version 1.0: 1995-02-07
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-11-29
    Changes: Derived calculations, Other
  • Version 1.4: 2024-02-07
    Changes: Data collection, Database references, Derived calculations