1KP3

Crystal Structure of E. coli Argininosuccinate Synthetase in Complex with ATP and Citrulline


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.192 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Substrate Induced Conformational Changes in Argininosuccinate Synthetase

Lemke, C.T.Howell, P.L.

(2002) J.Biol.Chem. 277: 13074-13081

  • DOI: 10.1074/jbc.M112436200
  • Primary Citation of Related Structures:  1KP2

  • PubMed Abstract: 
  • Argininosuccinate synthetase (AS) is the rate-limiting enzyme of both the urea and arginine-citrulline cycles. In mammals, deficiency of AS leads to citrullinemia, a debilitating and often fatal autosomal recessive urea cycle disorder, whereas its ov ...

    Argininosuccinate synthetase (AS) is the rate-limiting enzyme of both the urea and arginine-citrulline cycles. In mammals, deficiency of AS leads to citrullinemia, a debilitating and often fatal autosomal recessive urea cycle disorder, whereas its overexpression for sustained nitric oxide production via the arginine-citrulline cycle leads to the potentially fatal hypotension associated with septic and cytokine-induced circulatory shock. The crystal structures of Escherichia coli argininosuccinate synthetase (EAS) in complex with ATP and with ATP and citrulline have been determined at 2.0-A resolution. These are the first EAS structures to be solved in the presence of a nucleotide substrate and clearly identify the residues that interact with both ATP and citrulline. Two distinct conformations are revealed for ATP, both of which are believed to be catalytically relevant. In addition, comparisons of these EAS structures with those of the apoenzyme and EAS complexed with aspartate and citrulline (Lemke, C. T., and Howell, P. L. (2001) Structure (Lond.) 9, 1153-1164) provide structural evidence of ATP-induced conformational changes in the nucleotide binding domain. Combined, these structures also provide structural explanations of some of the observed kinetic properties of the enzyme and have enabled a detailed enzymatic mechanism of AS catalysis to be proposed.


    Related Citations: 
    • The 1.6 A Crystal Structure of E. coli Argininosuccinate Synthetase Suggests a Conformational Change during Catalysis
      Lemke, C.T.,Howell, P.L.
      (2001) Structure 9: 1153


    Organizational Affiliation

    Structural Biology and Biochemistry, Research Institute, Hospital for Sick Children, 555 University Avenue, Toronto, Ontario, M5G 1X8, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
argininosuccinate synthetase
A
455Escherichia coli (strain K12)Gene Names: argG
EC: 6.3.4.5
Find proteins for P0A6E4 (Escherichia coli (strain K12))
Go to UniProtKB:  P0A6E4
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ATP
Query on ATP

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Download CCD File 
A
ADENOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O13 P3
ZKHQWZAMYRWXGA-KQYNXXCUSA-N
 Ligand Interaction
PO4
Query on PO4

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A
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
GAI
Query on GAI

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Download CCD File 
A
GUANIDINE
C H5 N3
ZRALSGWEFCBTJO-UHFFFAOYSA-N
 Ligand Interaction
CIR
Query on CIR

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Download CCD File 
A
CITRULLINE
C6 H13 N3 O3
RHGKLRLOHDJJDR-BYPYZUCNSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.192 
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 76.478α = 90.00
b = 104.222β = 90.00
c = 128.835γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
CNSphasing
CNSrefinement
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-04-17
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance