2D06

Human Sult1A1 Complexed With Pap and estradiol


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.217 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

The structure of human SULT1A1 crystallized with estradiol. An insight into active site plasticity and substrate inhibition with multi-ring substrates

Gamage, N.U.Tsvetanov, S.Duggleby, R.G.McManus, M.E.Martin, J.L.

(2005) J.Biol.Chem. 280: 41482-41486

  • DOI: 10.1074/jbc.M508289200

  • PubMed Abstract: 
  • Human SULT1A1 belongs to the supergene family of sulfotransferases (SULTs) involved in the sulfonation of xeno- and endobiotics. The enzyme is also one of the SULTs responsible for metabolic activation of mutagenic and carcinogenic compounds and ther ...

    Human SULT1A1 belongs to the supergene family of sulfotransferases (SULTs) involved in the sulfonation of xeno- and endobiotics. The enzyme is also one of the SULTs responsible for metabolic activation of mutagenic and carcinogenic compounds and therefore is implicated in various cancer forms. Further, it is not well understood how substrate inhibition takes place with rigid fused multiring substrates such as 17beta-estradiol (E2) at high substrate concentrations when subcellular fractions or recombinant enzymes are used. To investigate how estradiol binds to SULT1A1, we co-crystallized SULT1A1 with sulfated estradiol and the cofactor product, PAP (3'-phosphoadenosine 5'-phosphate). The crystal structure of SULT1A1 that we present here has PAP and one molecule of E2 bound in a nonproductive mode in the active site. The structure reveals how the SULT1A1 binding site undergoes conformational changes to accept fused ring substrates such as steroids. In agreement with previous reports, the enzyme shows partial substrate inhibition at high concentrations of E2. A model to explain these kinetics is developed based on the formation of an enzyme x PAP x E2 dead-end complex during catalysis. This model provides a very good quantitative description of the rate versus the [E2] curve. This dead-end complex is proposed to be that described by the observed structure, where E2 is bound in a nonproductive mode.


    Organizational Affiliation

    School of Biomedical Sciences, University of Queensland, Brisbane, Queensland 4072, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Sulfotransferase 1A1
A, B
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
A3P
Query on A3P

Download SDF File 
Download CCD File 
A, B
ADENOSINE-3'-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
WHTCPDAXWFLDIH-KQYNXXCUSA-N
 Ligand Interaction
EST
Query on EST

Download SDF File 
Download CCD File 
A, B
ESTRADIOL
C18 H24 O2
VOXZDWNPVJITMN-ZBRFXRBCSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
ESTKi: 83200 nM BINDINGMOAD
ESTKi: 83200 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.217 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 123.640α = 90.00
b = 86.070β = 90.00
c = 72.950γ = 90.00
Software Package:
Software NamePurpose
TRUNCATEdata reduction
CCP4data scaling
CNSphasing
CNSrefinement
SCALEdata reduction
SCALEdata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-10-25
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-11
    Type: Advisory