1T3D

Crystal structure of Serine Acetyltransferase from E.coli at 2.2A


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.177 
  • R-Value Work: 0.151 
  • R-Value Observed: 0.175 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

The Structure and Mechanism of Serine Acetyltransferase from Escherichia coli

Pye, V.E.Tingey, A.P.Robson, R.L.Moody, P.C.E.

(2004) J Biol Chem 279: 40729-40736

  • DOI: https://doi.org/10.1074/jbc.M403751200
  • Primary Citation of Related Structures:  
    1T3D

  • PubMed Abstract: 

    Serine acetyltransferase (SAT) catalyzes the first step of cysteine synthesis in microorganisms and higher plants. Here we present the 2.2 A crystal structure of SAT from Escherichia coli, which is a dimer of trimers, in complex with cysteine. The SAT monomer consists of an amino-terminal alpha-helical domain and a carboxyl-terminal left-handed beta-helix. We identify His(158) and Asp(143) as essential residues that form a catalytic triad with the substrate for acetyl transfer. This structure shows the mechanism by which cysteine inhibits SAT activity and thus controls its own synthesis. Cysteine is found to bind at the serine substrate site and not the acetyl-CoA site that had been reported previously. On the basis of the geometry around the cysteine binding site, we are able to suggest a mechanism for the O-acetylation of serine by SAT. We also compare the structure of SAT with other left-handed beta-helical structures.


  • Organizational Affiliation

    Department of Biochemistry, University of Leicester, University Road, Leicester LE1 7HX, United Kingdom.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Serine acetyltransferase
A, B, C
289Escherichia coliMutation(s): 9 
Gene Names: CYSEB3607C4429Z5034ECS4485SF3646S4122
EC: 2.3.1.30
UniProt
Find proteins for P0A9D4 (Escherichia coli (strain K12))
Explore P0A9D4 
Go to UniProtKB:  P0A9D4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A9D4
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
MSE
Query on MSE
A, B, C
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.177 
  • R-Value Work: 0.151 
  • R-Value Observed: 0.175 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 121.98α = 90
b = 121.98β = 90
c = 127.52γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
SOLVEphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-07-13
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance