Crystal structure of anabolic ornithine carbamoyltransferase from Campylobacter jejuni subsp. jejuni NCTC 11168

Experimental Data Snapshot

  • Resolution: 2.70 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.204 

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This is version 1.4 of the entry. See complete history


Structure of anabolic ornithine carbamoyltransferase from Campylobacter jejuni at 2.7 A resolution.

Shabalin, I.G.Porebski, P.J.Cooper, D.R.Grabowski, M.Onopriyenko, O.Grimshaw, S.Savchenko, A.Chruszcz, M.Minor, W.

(2012) Acta Crystallogr Sect F Struct Biol Cryst Commun 68: 1018-1024

  • DOI: https://doi.org/10.1107/S1744309112031259
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Anabolic ornithine transcarbamoylase (aOTC) catalyzes the reaction between carbamoyl phosphate (CP) and L-ornithine (ORN) to form L-citrulline and phosphate in the urea cycle and L-arginine biosynthesis. The crystal structure of unliganded aOTC from Campylobacter jejuni (Cje aOTC) was determined at 2.7 Å resolution and refined to an R(work) of 20.3% and an R(free) of 24.0%. Cje aOTC is a trimer that forms a head-to-head pseudohexamer in the asymmetric unit. Each monomer is composed of an N-terminal CP-binding domain and a C-terminal ORN-binding domain joined by two interdomain helices. The Cje aOTC structure presents an open conformation of the enzyme with a relatively flexible orientation of the ORN-binding domain respective to the CP-binding domain. The conformation of the B2-H3 loop (residues 68-78), which is involved in binding CP in an adjacent subunit of the trimer, differs from that seen in homologous proteins with CP bound. The loop containing the ORN-binding motif (DxxxSMG, residues 223-230) has a conformation that is different from those observed in unliganded OTC structures from other species, but is similar to those in structures with bound ORN analogs. The major differences in tertiary structure between Cje aOTC and human aOTC are described.

  • Organizational Affiliation

    Department of Molecular Physiology and Biological Physics, University of Virginia, 1340 Jefferson Park Avenue, Charlottesville, VA 22908, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ornithine carbamoyltransferase
A, B, C, D, E
A, B, C, D, E, F
307Campylobacter jejuni subsp. jejuni NCTC 11168 = ATCC 700819Mutation(s): 0 
Gene Names: argFCj0994c
Find proteins for Q9PNU6 (Campylobacter jejuni subsp. jejuni serotype O:2 (strain ATCC 700819 / NCTC 11168))
Explore Q9PNU6 
Go to UniProtKB:  Q9PNU6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9PNU6
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on MSE
A, B, C, D, E
A, B, C, D, E, F
Experimental Data & Validation

Experimental Data

Unit Cell:
Length ( Å )Angle ( ˚ )
a = 157.163α = 90
b = 87.398β = 90
c = 141.561γ = 90
Software Package:
Software NamePurpose
HKL-3000data collection
Cootmodel building
HKL-3000data reduction
HKL-3000data scaling

Structure Validation

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Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2011-09-21
    Type: Initial release
  • Version 1.1: 2012-09-19
    Changes: Database references
  • Version 1.2: 2014-11-12
    Changes: Structure summary
  • Version 1.3: 2022-04-13
    Changes: Database references, Derived calculations, Structure summary
  • Version 1.4: 2023-09-13
    Changes: Data collection, Refinement description