3M4J

Crystal structure of N-acetyl-L-ornithine transcarbamylase complexed with PALAO


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.199 

Starting Model: experimental
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This is version 1.4 of the entry. See complete history


Literature

Reversible Post-Translational Carboxylation Modulates the Enzymatic Activity of N-Acetyl-l-ornithine Transcarbamylase.

Li, Y.Yu, X.Ho, J.Fushman, D.Allewell, N.M.Tuchman, M.Shi, D.

(2010) Biochemistry 49: 6887-6895

  • DOI: https://doi.org/10.1021/bi1007386
  • Primary Citation of Related Structures:  
    3M4J, 3M4N, 3M5C, 3M5D

  • PubMed Abstract: 

    N-Acetyl-l-ornithine transcarbamylase (AOTCase), rather than ornithine transcarbamylase (OTCase), is the essential carbamylase enzyme in the arginine biosynthesis of several plant and human pathogens. The specificity of this unique enzyme provides a potential target for controlling the spread of these pathogens. Recently, several crystal structures of AOTCase from Xanthomonas campestris (xc) have been determined. In these structures, an unexplained electron density at the tip of the Lys302 side chain was observed. Using (13)C NMR spectroscopy, we show herein that Lys302 is post-translationally carboxylated. The structure of wild-type AOTCase in a complex with the bisubstrate analogue N(delta)-(phosphonoacetyl)-N(alpha)-acetyl-l-ornithine (PALAO) indicates that the carboxyl group on Lys302 forms a strong hydrogen bonding network with surrounding active site residues, Lys252, Ser253, His293, and Glu92 from the adjacent subunit either directly or via a water molecule. Furthermore, the carboxyl group is involved in binding N-acetyl-l-ornithine via a water molecule. Activity assays with the wild-type enzyme and several mutants demonstrate that the post-translational modification of lysine 302 has an important role in catalysis.


  • Organizational Affiliation

    Research Center for Genetic Medicine and Department of Integrative Systems Biology, Children's National Medical Center, The George Washington University, Washington, DC 20010, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
N-acetylornithine carbamoyltransferase359Xanthomonas campestris pv. campestrisMutation(s): 0 
Gene Names: argFargF'XCC2249
EC: 2.1.3.9
UniProt
Find proteins for Q8P8J2 (Xanthomonas campestris pv. campestris (strain ATCC 33913 / DSM 3586 / NCPPB 528 / LMG 568 / P 25))
Explore Q8P8J2 
Go to UniProtKB:  Q8P8J2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8P8J2
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
KCX
Query on KCX
A
L-PEPTIDE LINKINGC7 H14 N2 O4LYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.199 
  • Space Group: I 21 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 128.88α = 90
b = 128.88β = 90
c = 128.88γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
CNSrefinement
PDB_EXTRACTdata extraction
CBASSdata collection
CNSphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-07-28
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-11-08
    Changes: Refinement description
  • Version 1.3: 2023-09-06
    Changes: Data collection, Database references, Derived calculations, Refinement description
  • Version 1.4: 2023-11-22
    Changes: Data collection