Crystal structure of aminoglycoside 6'-acetyltransferase type Ii in complex with coenzyme A

Experimental Data Snapshot

  • Resolution: 1.80 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.208 

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X-ray structure of the AAC(6')-Ii antibiotic resistance enzyme at 1.8 A resolution; examination of oligomeric arrangements in GNAT superfamily members

Burk, D.L.Ghuman, N.Wybenga-Groot, L.E.Berghuis, A.M.

(2003) Protein Sci 12: 426-437

  • DOI: https://doi.org/10.1110/ps.0233503
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The rise of antibiotic resistance as a public health concern has led to increased interest in studying the ways in which bacteria avoid the effects of antibiotics. Enzymatic inactivation by several families of enzymes has been observed to be the predominant mechanism of resistance to aminoglycoside antibiotics such as kanamycin and gentamicin. Despite the importance of acetyltransferases in bacterial resistance to aminoglycoside antibiotics, relatively little is known about their structure and mechanism. Here we report the three-dimensional atomic structure of the aminoglycoside acetyltransferase AAC(6')-Ii in complex with coenzyme A (CoA). This structure unambiguously identifies the physiologically relevant AAC(6')-Ii dimer species, and reveals that the enzyme structure is similar in the AcCoA and CoA bound forms. AAC(6')-Ii is a member of the GCN5-related N-acetyltransferase (GNAT) superfamily of acetyltransferases, a diverse group of enzymes that possess a conserved structural motif, despite low sequence homology. AAC(6')-Ii is also a member of a subset of enzymes in the GNAT superfamily that form multimeric complexes. The dimer arrangements within the multimeric GNAT superfamily members are compared, revealing that AAC(6')-Ii forms a dimer assembly that is different from that observed in the other multimeric GNAT superfamily members. This different assembly may provide insight into the evolutionary processes governing dimer formation.

  • Organizational Affiliation

    Departments of Biochemistry and Microbiology and Immunology, McGill University, Montreal, Quebec H3A 2B4, Canada.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D
180Enterococcus faeciumMutation(s): 0 
Find proteins for Q47764 (Enterococcus faecium)
Explore Q47764 
Go to UniProtKB:  Q47764
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ47764
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.80 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.208 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 73.19α = 90
b = 76.92β = 90
c = 130.15γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-03-18
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-02-14
    Changes: Data collection, Database references, Derived calculations, Refinement description