3SG8

Crystal Structure of Aminoglycoside-2''-Phosphotransferase Type IVa Tobramycin Complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.188 

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This is version 1.3 of the entry. See complete history


Literature

Crystal Structures of Antibiotic-Bound Complexes of Aminoglycoside 2''-Phosphotransferase IVa Highlight the Diversity in Substrate Binding Modes among Aminoglycoside Kinases.

Shi, K.Houston, D.R.Berghuis, A.M.

(2011) Biochemistry 50: 6237-6244

  • DOI: https://doi.org/10.1021/bi200747f
  • Primary Citation of Related Structures:  
    3SG8, 3SG9, 3SGC

  • PubMed Abstract: 

    Aminoglycoside 2''-phosphotransferase IVa [APH(2'')-IVa] is a member of a family of bacterial enzymes responsible for medically relevant resistance to antibiotics. APH(2'')-IVa confers high-level resistance against several clinically used aminoglycoside antibiotics in various pathogenic Enterococcus species by phosphorylating the drug, thereby preventing it from binding to its ribosomal target and producing a bactericidal effect. We describe here three crystal structures of APH(2'')-IVa, one in its apo form and two in complex with a bound antibiotic, tobramycin and kanamycin A. The apo structure was refined to a resolution of 2.05 Å, and the APH(2'')-IVa structures with tobramycin and kanamycin A bound were refined to resolutions of 1.80 and 2.15 Å, respectively. Comparison among the structures provides insight concerning the substrate selectivity of this enzyme. In particular, conformational changes upon substrate binding, involving rotational shifts of two distinct segments of the enzyme, are observed. These substrate-induced shifts may also rationalize the altered substrate preference of APH(2'')-IVa in comparison to those of other members of the APH(2'') subfamily, which are structurally closely related. Finally, analysis of the interactions between the enzyme and aminoglycoside reveals a distinct binding mode as compared to the intended ribosomal target. The differences in the pattern of interactions can be utilized as a structural basis for the development of improved aminoglycosides that are not susceptible to these resistance factors.


  • Organizational Affiliation

    Department of Biochemistry, Groupe de Recherche Axé sur la Structure des Protéines, McGill University, 3649 Promenade Sir William Osler, Montreal, Quebec H3G 0B1, Canada. [email protected]


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
APH(2'')-Id
A, B
304Enterococcus casseliflavusMutation(s): 0 
Gene Names: aph(2'')-Id
UniProt
Find proteins for O68183 (Enterococcus casseliflavus)
Explore O68183 
Go to UniProtKB:  O68183
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO68183
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.188 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 43.334α = 90
b = 101.479β = 100.78
c = 73.455γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
PHASERphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-06-29
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2011-07-27
    Changes: Database references
  • Version 1.3: 2024-02-28
    Changes: Data collection, Database references, Derived calculations