5CTS

PROPOSED MECHANISM FOR THE CONDENSATION REACTION OF CITRATE SYNTHASE. 1.9-ANGSTROMS STRUCTURE OF THE TERNARY COMPLEX WITH OXALOACETATE AND CARBOXYMETHYL COENZYME A


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Proposed mechanism for the condensation reaction of citrate synthase: 1.9-A structure of the ternary complex with oxaloacetate and carboxymethyl coenzyme A.

Karpusas, M.Branchaud, B.Remington, S.J.

(1990) Biochemistry 29: 2213-2219

  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The crystal structure of the ternary complex citrate synthase-oxaloacetate-carboxymethyl coenzyme A has been solved to a resolution of 1.9 A and refined to a conventional crystallographic R factor of 0.185. The structure resembles a proposed transiti ...

    The crystal structure of the ternary complex citrate synthase-oxaloacetate-carboxymethyl coenzyme A has been solved to a resolution of 1.9 A and refined to a conventional crystallographic R factor of 0.185. The structure resembles a proposed transition state of the condensation reaction and suggests that the condensation reaction proceeds through a neutral enol rather than an enolate intermediate. A mechanism for the condensation reaction is proposed which involves the participation of three key catalytic groups (Asp 375, His 274, and His 320) in two distinct steps. The proposed mechanism invokes concerted general acid-base catalysis twice to explain both the energetics of the reaction and the experimentally observed inversion of stereochemistry at the attacking carbon atom.


    Related Citations: 
    • Crystal Structure Analysis of the Tetragonal Crystal Form and Preliminary Molecular Model of Pig-Heart Citrate Synthase
      Wiegand, G.,Kukla, D.,Scholze, H.,Jones, T.A.,Huber, R.
      (1979) Eur.J.Biochem. 93: 41
    • Crystallographic Refinement and Atomic Models of Two Different Forms of Citrate Synthase at 2.7 And 1.7 Angstroms Resolution
      Remington, S.,Wiegand, G.,Huber, R.
      (1982) J.Mol.Biol. 158: 111
    • Primary Structure of Porcine Heart Citrate Synthase
      Bloxham, D.P.,Parmelee, D.C.,Kumar, S.,Wade, R.D.,Ericsson, L.H.,Neurath, H.,Walsh, K.A.,Titani, K.
      (1981) Proc.Natl.Acad.Sci.USA 78: 5381
    • Crystal Structure Analysis and Molecular Model of a Complex of Citrate Synthase with Oxaloacetate and S-Acetonyl-Coenzymea
      Wiegand, G.,Remington, S.,Deisenhofer, J.,Huber, R.
      (1984) J.Mol.Biol. 174: 205


    Organizational Affiliation

    Institute of Molecular Biology, University of Oregon, Eugene 97403.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CITRATE SYNTHASE
A
433Gallus gallusMutation(s): 0 
Gene Names: CS
EC: 2.3.3.1
Find proteins for P23007 (Gallus gallus)
Go to Gene View: CS
Go to UniProtKB:  P23007
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CMC
Query on CMC

Download SDF File 
Download CCD File 
A
CARBOXYMETHYL COENZYME *A
C23 H38 N7 O18 P3 S
OBUOSIHPWVNVJN-GRFIIANRSA-N
 Ligand Interaction
OAA
Query on OAA

Download SDF File 
Download CCD File 
A
OXALOACETATE ION
C4 H3 O5
KHPXUQMNIQBQEV-UHFFFAOYSA-M
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
UNK
Query on UNK
A
L-PEPTIDE LINKINGC4 H9 N O2

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 104.000α = 90.00
b = 78.100β = 78.90
c = 58.300γ = 90.00
Software Package:
Software NamePurpose
TNTrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1990-10-15
    Type: Initial release
  • Version 1.1: 2008-03-25
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance
  • Version 1.3: 2017-11-29
    Type: Derived calculations, Other