1LS6

Human SULT1A1 complexed with PAP and p-Nitrophenol


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.181 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of a human carcinogen-converting enzyme, SULT1A1. Structural and kinetic implications of substrate inhibition.

Gamage, N.U.Duggleby, R.G.Barnett, A.C.Tresillian, M.Latham, C.F.Liyou, N.E.McManus, M.E.Martin, J.L.

(2003) J.Biol.Chem. 278: 7655-7662

  • DOI: 10.1074/jbc.M207246200

  • PubMed Abstract: 
  • Sulfonation catalyzed by sulfotransferase enzymes plays an important role in chemical defense mechanisms against various xenobiotics but also bioactivates carcinogens. A major human sulfotransferase, SULT1A1, metabolizes and/or bioactivates many endo ...

    Sulfonation catalyzed by sulfotransferase enzymes plays an important role in chemical defense mechanisms against various xenobiotics but also bioactivates carcinogens. A major human sulfotransferase, SULT1A1, metabolizes and/or bioactivates many endogenous compounds and is implicated in a range of cancers because of its ability to modify diverse promutagen and procarcinogen xenobiotics. The crystal structure of human SULT1A1 reported here is the first sulfotransferase structure complexed with a xenobiotic substrate. An unexpected finding is that the enzyme accommodates not one but two molecules of the xenobiotic model substrate p-nitrophenol in the active site. This result is supported by kinetic data for SULT1A1 that show substrate inhibition for this small xenobiotic. The extended active site of SULT1A1 is consistent with binding of diiodothyronine but cannot easily accommodate beta-estradiol, although both are known substrates. This observation, together with evidence for a disorder-order transition in SULT1A1, suggests that the active site is flexible and can adapt its architecture to accept diverse hydrophobic substrates with varying sizes, shapes and flexibility. Thus the crystal structure of SULT1A1 provides the molecular basis for substrate inhibition and reveals the first clues as to how the enzyme sulfonates a wide variety of lipophilic compounds.


    Organizational Affiliation

    Department of Physiology and Pharmacology, School of Biomedical Sciences, University of Queensland, Brisbane, Queensland 4072, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
aryl sulfotransferase
A
295Homo sapiensGene Names: SULT1A1 (STP, STP1)
EC: 2.8.2.1
Find proteins for P50225 (Homo sapiens)
Go to Gene View: SULT1A1
Go to UniProtKB:  P50225
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NPO
Query on NPO

Download SDF File 
Download CCD File 
A
P-NITROPHENOL
C6 H5 N O3
BTJIUGUIPKRLHP-UHFFFAOYSA-N
 Ligand Interaction
A3P
Query on A3P

Download SDF File 
Download CCD File 
A
ADENOSINE-3'-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
WHTCPDAXWFLDIH-KQYNXXCUSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.181 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 72.800α = 90.00
b = 124.010β = 90.00
c = 44.450γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
crystaldata collection
CrystalCleardata scaling
CrystalCleardata reduction
CNSphasing
Crystaldata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-08-05
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance