6Y9C

The structure of a quaternary ammonium Rieske monooxygenase reveals insights into carnitine oxidation by gut microbiota and inter-subunit electron transfer


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.292 
  • R-Value Work: 0.246 
  • R-Value Observed: 0.248 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Characterisation of an unusual cysteine pair in the Rieske carnitine monooxygenase CntA catalytic site.

Quareshy, M.Shanmugam, M.Cameron, A.D.Bugg, T.D.H.Chen, Y.

(2023) FEBS J 

  • DOI: https://doi.org/10.1111/febs.16722
  • Primary Citation of Related Structures:  
    6Y9C

  • PubMed Abstract: 

    Rieske monooxygenases undertake complex catalysis integral to marine, terrestrial and human gut-ecosystems. Group-I to -IV Rieske monooxygenases accept aromatic substrates and have well-characterised catalytic mechanisms. Nascent to our understanding are Group-V members catalysing the oxidation/breakdown of quaternary ammonium substrates. Phylogenetic analysis of Group V highlights a cysteine residue-pair adjacent to the mononuclear Fe active site with no established role. Following our elucidation of the carnitine monooxygenase CntA structure, we probed the function of the cysteine pair Cys206/Cys209. Utilising biochemical and biophysical techniques, we found the cysteine residues do not play a structural role nor influence the electron transfer pathway, but rather are used in a nonstoichiometric role to ensure the catalytic iron centre remains in an Fe(II) state.


  • Organizational Affiliation

    School of Life Sciences, University of Warwick, Coventry, UK.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Carnitine monooxygenase oxygenase subunit391Acinetobacter baumanniiMutation(s): 1 
Gene Names: 
EC: 1.14.13.239
UniProt
Find proteins for D0C9N6 (Acinetobacter baumannii (strain ATCC 19606 / DSM 30007 / JCM 6841 / CCUG 19606 / CIP 70.34 / NBRC 109757 / NCIMB 12457 / NCTC 12156 / 81))
Explore D0C9N6 
Go to UniProtKB:  D0C9N6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupD0C9N6
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.292 
  • R-Value Work: 0.246 
  • R-Value Observed: 0.248 
  • Space Group: P 63
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 91.242α = 90
b = 91.242β = 90
c = 87.366γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
xia2data reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Leverhulme TrustUnited KingdomRPG-2016-307

Revision History  (Full details and data files)

  • Version 1.0: 2021-03-31
    Type: Initial release
  • Version 1.1: 2023-01-18
    Changes: Database references
  • Version 1.2: 2024-01-31
    Changes: Data collection, Refinement description