Crystal Structure of Chloramphenicol Acetyltransferase from Elizabethkingia anophelis

Experimental Data Snapshot

  • Resolution: 1.65 Å
  • R-Value Free: 0.164 
  • R-Value Work: 0.145 
  • R-Value Observed: 0.146 

Starting Model: experimental
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Structural characterization of a Type B chloramphenicol acetyltransferase from the emerging pathogen Elizabethkingia anophelis NUHP1.

Ghafoori, S.M.Robles, A.M.Arada, A.M.Shirmast, P.Dranow, D.M.Mayclin, S.J.Lorimer, D.D.Myler, P.J.Edwards, T.E.Kuhn, M.L.Forwood, J.K.

(2021) Sci Rep 11: 9453-9453

  • DOI: https://doi.org/10.1038/s41598-021-88672-z
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Elizabethkingia anophelis is an emerging multidrug resistant pathogen that has caused several global outbreaks. E. anophelis belongs to the large family of Flavobacteriaceae, which contains many bacteria that are plant, bird, fish, and human pathogens. Several antibiotic resistance genes are found within the E. anophelis genome, including a chloramphenicol acetyltransferase (CAT). CATs play important roles in antibiotic resistance and can be transferred in genetic mobile elements. They catalyse the acetylation of the antibiotic chloramphenicol, thereby reducing its effectiveness as a viable drug for therapy. Here, we determined the high-resolution crystal structure of a CAT protein from the E. anophelis NUHP1 strain that caused a Singaporean outbreak. Its structure does not resemble that of the classical Type A CATs but rather exhibits significant similarity to other previously characterized Type B (CatB) proteins from Pseudomonas aeruginosa, Vibrio cholerae and Vibrio vulnificus, which adopt a hexapeptide repeat fold. Moreover, the CAT protein from E. anophelis displayed high sequence similarity to other clinically validated chloramphenicol resistance genes, indicating it may also play a role in resistance to this antibiotic. Our work expands the very limited structural and functional coverage of proteins from Flavobacteriaceae pathogens which are becoming increasingly more problematic.

  • Organizational Affiliation

    School of Biomedical Sciences, Charles Sturt University, Wagga Wagga, NSW, 2650, Australia.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Chloramphenicol acetyltransferase216Elizabethkingia anophelisMutation(s): 0 
Gene Names: catBBAY10_06425E18064_290343
Find proteins for X5KVH4 (Elizabethkingia anophelis)
Explore X5KVH4 
Go to UniProtKB:  X5KVH4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupX5KVH4
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.65 Å
  • R-Value Free: 0.164 
  • R-Value Work: 0.145 
  • R-Value Observed: 0.146 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 102.95α = 90
b = 102.95β = 90
c = 115.27γ = 120
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling
PDB_EXTRACTdata extraction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-10-03
    Type: Initial release
  • Version 1.1: 2022-02-09
    Changes: Database references
  • Version 1.2: 2023-10-11
    Changes: Data collection, Refinement description