Formyl-CoA:oxalate CoA-transferase from Acetobacter aceti

Experimental Data Snapshot

  • Resolution: 1.99 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.198 

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This is version 1.2 of the entry. See complete history


Formyl-coenzyme A (CoA): Oxalate CoA-transferase from the acidophile Acetobacter aceti has a distinctive electrostatic surface and inherent acid stability.

Mullins, E.A.Starks, C.M.Francois, J.A.Sael, L.Kihara, D.Kappock, T.J.

(2012) Protein Sci 21: 686-696

  • DOI: https://doi.org/10.1002/pro.2054
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Bacterial formyl-CoA:oxalate CoA-transferase (FCOCT) and oxalyl-CoA decarboxylase work in tandem to perform a proton-consuming decarboxylation that has been suggested to have a role in generalized acid resistance. FCOCT is the product of uctB in the acidophilic acetic acid bacterium Acetobacter aceti. As expected for an acid-resistance factor, UctB remains folded at the low pH values encountered in the A. aceti cytoplasm. A comparison of crystal structures of FCOCTs and related proteins revealed few features in UctB that would distinguish it from nonacidophilic proteins and thereby account for its acid stability properties, other than a strikingly featureless electrostatic surface. The apparently neutral surface is a result of a "speckled" charge decoration, in which charged surface residues are surrounded by compensating charges but do not form salt bridges. A quantitative comparison among orthologs identified a pattern of residue substitution in UctB that may be a consequence of selection for protein stability by constant exposure to acetic acid. We suggest that this surface charge pattern, which is a distinctive feature of A. aceti proteins, creates a stabilizing electrostatic network without stiffening the protein or compromising protein-solvent interactions.

  • Organizational Affiliation

    Department of Biochemistry, Purdue University, West Lafayette, Indiana 47907, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Formyl-CoA:oxalate CoA-transferase
A, B, C, D
456Acetobacter acetiMutation(s): 0 
Gene Names: uctB
EC: 2.8.3
Find proteins for A9X6P7 (Acetobacter aceti)
Explore A9X6P7 
Go to UniProtKB:  A9X6P7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA9X6P7
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.99 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.198 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 98.164α = 90
b = 121.612β = 90
c = 161.377γ = 90
Software Package:
Software NamePurpose
SCALAdata scaling
PDB_EXTRACTdata extraction
d*TREKdata scaling
d*TREKdata reduction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-03-21
    Type: Initial release
  • Version 1.1: 2012-04-18
    Changes: Database references
  • Version 1.2: 2023-09-13
    Changes: Data collection, Database references, Derived calculations, Refinement description