1FCJ

CRYSTAL STRUCTURE OF OASS COMPLEXED WITH CHLORIDE AND SULFATE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.200 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Identification of an allosteric anion-binding site on O-acetylserine sulfhydrylase: structure of the enzyme with chloride bound.

Burkhard, P.Tai, C.H.Jansonius, J.N.Cook, P.F.

(2000) J.Mol.Biol. 303: 279-286

  • DOI: 10.1006/jmbi.2000.4109

  • PubMed Abstract: 
  • A new crystal structure of O-acetylserine sulfhydrylase (OASS) has been solved with chloride bound at an allosteric site and sulfate bound at the active site. The bound anions result in a new "inhibited" conformation, that differs from the "open" nat ...

    A new crystal structure of O-acetylserine sulfhydrylase (OASS) has been solved with chloride bound at an allosteric site and sulfate bound at the active site. The bound anions result in a new "inhibited" conformation, that differs from the "open" native or "closed" external aldimine conformations. The allosteric site is located at the OASS dimer interface. The new inhibited structure involves a change in the position of the "moveable domain" (residues 87-131) to a location that differs from that in the open or closed forms. Formation of the external aldimine with substrate is stabilized by interaction of the alpha-carboxyl group of the substrate with a substrate-binding loop that is part of the moveable domain. The inhibited conformation prevents the substrate-binding loop from interacting with the alpha-carboxyl group, and hinders formation of the external Schiff base and thus subsequent chemistry. Chloride may be an analog of sulfide, the physiological inhibitor. Finally, these results suggest that OASS represents a new class of PLP-dependent enzymes that is regulated by small anions.


    Related Citations: 
    • Lingand binding induces a large conformational change in O-acetylserine sulfhydrylase from salmonella typhimurium
      Burkhard, P.,Tai, C.,Ristroph, C.M.,Cook, P.F.,Jansonius, J.N.
      (1999) J.Mol.Biol. 291: 941
    • Three-dimensional structure of O-acetylserine sulfhydrylase from salmonella typhimurium
      Burkhard, P.,Jagannatha Rao, G.S.,Hohenester, E.,Schnackerz, K.D.,Cook, P.F.,Jansonius, J.N.
      (1998) J.Mol.Biol. 283: 121


    Organizational Affiliation

    M.E. Müller Institute for Structural Biology. Peter.Burkhard@unibas.ch




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
O-ACETYLSERINE SULFHYDRYLASE
A, B, C, D
322Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)Gene Names: cysK
EC: 2.5.1.47
Find proteins for P0A1E3 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Go to UniProtKB:  P0A1E3
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A, B, C, D
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
CL
Query on CL

Download SDF File 
Download CCD File 
A, B, C, D
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
PLP
Query on PLP

Download SDF File 
Download CCD File 
A, B, C, D
PYRIDOXAL-5'-PHOSPHATE
VITAMIN B6 Phosphate
C8 H10 N O6 P
NGVDGCNFYWLIFO-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.200 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 96.380α = 90.00
b = 100.490β = 90.00
c = 142.810γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
CNSrefinement
MOSFLMdata reduction
CCP4data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2000-10-18
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Non-polymer description, Version format compliance