1RAL

THREE-DIMENSIONAL STRUCTURE OF RAT LIVER 3ALPHA-HYDROXYSTEROID(SLASH)DIHYDRODIOL DEHYDROGENASE: A MEMBER OF THE ALDO-KETO REDUCTASE SUPERFAMILY


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Work: 0.220 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Three-dimensional structure of rat liver 3 alpha-hydroxysteroid/dihydrodiol dehydrogenase: a member of the aldo-keto reductase superfamily.

Hoog, S.S.Pawlowski, J.E.Alzari, P.M.Penning, T.M.Lewis, M.

(1994) Proc.Natl.Acad.Sci.USA 91: 2517-2521


  • PubMed Abstract: 
  • The 3.0-A-resolution x-ray structure of rat liver 3 alpha-hydroxysteroid dehydrogenase/dihydrodiol dehydrogenase (3 alpha-HSD, EC 1.1.1.50) was determined by molecular replacement using human placental aldose reductase as the search model. The protei ...

    The 3.0-A-resolution x-ray structure of rat liver 3 alpha-hydroxysteroid dehydrogenase/dihydrodiol dehydrogenase (3 alpha-HSD, EC 1.1.1.50) was determined by molecular replacement using human placental aldose reductase as the search model. The protein folds into an alpha/beta or triose-phosphate isomerase barrel and lacks a canonical Rossmann fold for binding pyridine nucleotide. The structure contains a concentration of hydrophobic amino acids that lie in a cavity near the top of the barrel and that are presumed to be involved in binding hydrophobic substrates (steroids, prostaglandins, and polycyclic aromatic hydrocarbons) and inhibitors (nonsteroidal antiinflammatory drugs). At the distal end of this cavity lie three residues in close proximity that have been implicated in catalysis by site-directed mutagenesis--Tyr-55, Asp-50, and Lys-84. Tyr-55 is postulated to act as the general acid. 3 alpha-HSD shares significant sequence identity with other HSDs that belong to the aldo-keto reductase superfamily and these may show similar architecture. Other members of this family include prostaglandin F synthase and rho-crystallin. By contrast, 3 alpha-HSD shares no sequence identity with HSDs that are members of the short-chain alcohol dehydrogenase family but does contain the Tyr-Xaa-Xaa-Xaa-Lys consensus sequence implicated in catalysis in this family. In the 3 alpha-HSD structure these residues are on the periphery of the barrel and are unlikely to participate in catalysis.


    Organizational Affiliation

    Department of Biochemistry and Biophysics, University of Pennsylvania School of Medicine, Philadelphia 19104-6084.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
3-ALPHA-HYDROXYSTEROID DEHYDROGENASE
A
308Rattus norvegicusMutation(s): 0 
Gene Names: Akr1c9
EC: 1.1.1.50
Find proteins for P23457 (Rattus norvegicus)
Go to UniProtKB:  P23457
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Work: 0.220 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 51.300α = 90.00
b = 89.500β = 90.00
c = 143.300γ = 90.00
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
X-PLORphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1994-04-30
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance