Crystal structure of human pregnenolone sulfotransferase (SULT2B1a) in the presence of PAP

Experimental Data Snapshot

  • Resolution: 2.91 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.249 
  • R-Value Observed: 0.249 

Starting Model: experimental
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Crystal structure of human cholesterol sulfotransferase (SULT2B1b) in the presence of pregnenolone and 3'-phosphoadenosine 5'-phosphate. Rationale for specificity differences between prototypical SULT2A1 and the SULT2BG1 isoforms.

Lee, K.A.Fuda, H.Lee, Y.C.Negishi, M.Strott, C.A.Pedersen, L.C.

(2003) J Biol Chem 278: 44593-44599

  • DOI: https://doi.org/10.1074/jbc.M308312200
  • Primary Citation of Related Structures:  
    1Q1Q, 1Q1Z, 1Q20, 1Q22

  • PubMed Abstract: 

    The gene for human hydroxysteroid sulfotransferase (SULT2B1) encodes two peptides, SULT2B1a and SULT2B1b, that differ only at their amino termini. SULT2B1b has a predilection for cholesterol but is also capable of sulfonating pregnenolone, whereas SULT2B1a preferentially sulfonates pregnenolone and only minimally sulfonates cholesterol. We have determined the crystal structure of SULT2B1a and SULT2B1b bound to the substrate donor product 3'-phosphoadenosine 5'-phosphate at 2.9 and 2.4 A, respectively, as well as SULT2B1b in the presence of the acceptor substrate pregnenolone at 2.3 A. These structures reveal a different catalytic binding orientation for the substrate from a previously determined structure of hydroxysteroid sulfotransferase (SULT2A1) binding dehydroepiandrosterone. In addition, the amino-terminal helix comprising residues Asp19 to Lys26, which determines the specificity difference between the SULT2B1 isoforms, becomes ordered upon pregnenolone binding, covering the substrate binding pocket.

  • Organizational Affiliation

    Laboratory of Structural Biology, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina 27709, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
sulfotransferase family, cytosolic, 2B, member 1 isoform a350Homo sapiensMutation(s): 0 
Gene Names: SULT2B1
UniProt & NIH Common Fund Data Resources
Find proteins for O00204 (Homo sapiens)
Explore O00204 
Go to UniProtKB:  O00204
PHAROS:  O00204
GTEx:  ENSG00000088002 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO00204
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.91 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.249 
  • R-Value Observed: 0.249 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 75.244α = 90
b = 75.244β = 90
c = 252.246γ = 90
Software Package:
Software NamePurpose
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-11-11
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-11
    Changes: Refinement description
  • Version 1.4: 2023-08-16
    Changes: Data collection, Database references, Derived calculations, Refinement description