1AFS

RECOMBINANT RAT LIVER 3-ALPHA-HYDROXYSTEROID DEHYDROGENASE (3-ALPHA-HSD) COMPLEXED WITH NADP AND TESTOSTERONE

• PDB DOI: https://doi.org/10.2210/pdb1AFS/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Rattus norvegicus
• Expression System: unidentified
• Mutation(s): No 


• Deposited: 1997-03-13 Released: 1997-10-08 
• Deposition Author(s): Bennett, M.J., Albert, R.H., Jez, J.M., Ma, H., Penning, T.M., Lewis, M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.242 
• R-Value Work: 0.188 
• R-Value Observed: 0.188 

Literature

Steroid recognition and regulation of hormone action: crystal structure of testosterone and NADP+ bound to 3 alpha-hydroxysteroid/dihydrodiol dehydrogenase.

Bennett, M.J., Albert, R.H., Jez, J.M., Ma, H., Penning, T.M., Lewis, M.

(1997) Structure 5: 799-812

• PubMed: 9261071 
• DOI: https://doi.org/10.1016/s0969-2126(97)00234-7
• Primary Citation of Related Structures:  
  1AFS


• PubMed Abstract: 
  

  Mammalian 3 alpha-hydroxysteroid dehydrogenases (3 alpha-HSDs) modulate the activities of steroid hormones by reversibly reducing their C3 ketone groups. In steroid target tissues, 3 alpha-HSDs act on 5 alpha-dihydrotestosterone, a potent male sex hormone (androgen) implicated in benign prostate hyperplasia and prostate cancer. Rat liver 3 alpha-HSD belongs to the aldo-keto reductase (AKR) superfamily and provides a model for mammalian 3 alpha-, 17 beta- and 20 alpha-HSDs, which share > 65% sequence identity. The determination of the structure of 3 alpha-HSD in complex with NADP+ and testosterone (a competitive inhibitor) will help to further our understanding of steroid recognition and hormone regulation by mammalian HSDs.

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Organizational Affiliation: 

Department of Biochemistry and Biophysics, Johnson Research Foundation, Philadelphia, PA 19104-6059, USA.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 76.45 kDa 
• Atom Count: 5,358 
• Modelled Residue Count: 638 
• Deposited Residue Count: 646 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
3-ALPHA-HYDROXYSTEROID DEHYDROGENASE	A, B	323	Rattus norvegicus	Mutation(s): 0  EC: 1.1.1.50
UniProt
Find proteins for P23457 (Rattus norvegicus) Explore P23457  Go to UniProtKB:  P23457

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
NAP	C [auth A], E [auth B]	NADP NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE C21 H28 N7 O17 P3 XJLXINKUBYWONI-NNYOXOHSSA-N
TES	D [auth A], F [auth B]	TESTOSTERONE C19 H28 O2 MUMGGOZAMZWBJJ-DYKIIFRCSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.242 
• R-Value Work: 0.188 
• R-Value Observed: 0.188 
• Space Group: P 2₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 96.4	α = 90
b = 157.1	β = 90
c = 49	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
DENZO	data reduction
SCALEPACK	data scaling
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1997-10-08 
Deposition Author(s): Bennett, M.J., Albert, R.H., Jez, J.M., Ma, H., Penning, T.M., Lewis, M.

Revision History  

• Version 1.0: 1997-10-08
  Type: Initial release
  
• Version 1.1: 2008-03-03
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2023-08-02
  Changes: Database references, Derived calculations, Other, Refinement description