Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 34.93 kDa 
• Atom Count: 2572 
• Residue Count: 288 
• Unique protein chains: 1

1LS6

Human SULT1A1 complexed with PAP and p-Nitrophenol

• DOI: 10.2210/pdb1LS6/pdb

• Classification: TRANSFERASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2002-05-17 Released: 2003-08-05 
• Deposition Author(s): Gamage, N.U., Barnett, A.C., Tresillian, M., Latham, C.F., Liyou, N.E., McManus, M.E., Martin, J.L.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free: 0.206 
• R-Value Work: 0.181 
• R-Value Observed: 0.191 

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

• PubMed: 12471039 
• DOI: 10.1074/jbc.M207246200
• Structures With Same Primary Citation


• 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 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.

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Organizational Affiliation: 

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

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
aryl sulfotransferase	A	295	Homo sapiens	Mutation(s): 0  Gene Names: SULT1A1, STP, STP1, OK/SW-cl.88 EC: 2.8.2.1
Find proteins for P50225 (Homo sapiens) Explore P50225  Go to UniProtKB:  P50225
NIH Common Fund Data Resources
PHAROS  P50225 GTEx  ENSG00000196502

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
A3P	A	ADENOSINE-3'-5'-DIPHOSPHATE C10 H15 N5 O10 P2 WHTCPDAXWFLDIH-KQYNXXCUSA-N
NPO	A	P-NITROPHENOL C6 H5 N O3 BTJIUGUIPKRLHP-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free: 0.206 
• R-Value Work: 0.181 
• R-Value Observed: 0.191 
• Space Group: P 2₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 72.8	α = 90
b = 124.01	β = 90
c = 44.45	γ = 90

Software Package:

Software Name	Purpose
crystal	data collection
Crystal	data reduction
CNS	refinement
CrystalClear	data reduction
CrystalClear	data scaling
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2002-05-17 
• Released Date: 2003-08-05 
Deposition Author(s): Gamage, N.U., Barnett, A.C., Tresillian, M., Latham, C.F., Liyou, N.E., McManus, M.E., Martin, J.L.

Revision History 

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