1T3D

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.177 
  • R-Value Work: 0.151 

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: 10.1074/jbc.M403751200

  • 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 SA ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Serine acetyltransferase
A, B, C
289Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: cysE
EC: 2.3.1.30
Find proteins for P0A9D4 (Escherichia coli (strain K12))
Go to UniProtKB:  P0A9D4
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CYS
Query on CYS

Download SDF File 
Download CCD File 
B
CYSTEINE
C3 H7 N O2 S
XUJNEKJLAYXESH-REOHCLBHSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D 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: 2.2 Å
  • R-Value Free: 0.177 
  • R-Value Work: 0.151 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 121.980α = 90.00
b = 121.980β = 90.00
c = 127.520γ = 120.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
SOLVEphasing
DENZOdata reduction
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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