5IQB

Aminoglycoside Phosphotransferase (2'')-Ia (CTD of AAC(6')-Ie/APH(2'')-Ia) in complex with GMPPNP, Magnesium, and Kanamycin A


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.169 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Antibiotic Binding Drives Catalytic Activation of Aminoglycoside Kinase APH(2)-Ia.

Caldwell, S.J.Huang, Y.Berghuis, A.M.

(2016) Structure 24: 935-945

  • DOI: https://doi.org/10.1016/j.str.2016.04.002
  • Primary Citation of Related Structures:  
    5BYL, 5IQA, 5IQB, 5IQC, 5IQD, 5IQE, 5IQF, 5IQG, 5IQH, 5IQI

  • PubMed Abstract: 

    APH(2″)-Ia is a widely disseminated resistance factor frequently found in clinical isolates of Staphylococcus aureus and pathogenic enterococci, where it is constitutively expressed. APH(2″)-Ia confers high-level resistance to gentamicin and related aminoglycosides through phosphorylation of the antibiotic using guanosine triphosphate (GTP) as phosphate donor. We have determined crystal structures of the APH(2″)-Ia in complex with GTP analogs, guanosine diphosphate, and aminoglycosides. These structures collectively demonstrate that aminoglycoside binding to the GTP-bound kinase drives conformational changes that bring distant regions of the protein into contact. These changes in turn drive a switch of the triphosphate cofactor from an inactive, stabilized conformation to a catalytically competent active conformation. This switch has not been previously reported for antibiotic kinases or for the structurally related eukaryotic protein kinases. This catalytic triphosphate switch presents a means by which the enzyme can curtail wasteful hydrolysis of GTP in the absence of aminoglycosides, providing an evolutionary advantage to this enzyme.


  • Organizational Affiliation

    Department of Biochemistry, McGill University, Montreal, QC H3G 1Y6, Canada; Groupe de Recherche Axé sur la Structure des Protéines, McGill University, Montreal, QC H3G 0B1, Canada.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Bifunctional AAC/APH
A, B, C, D
305Staphylococcus aureusMutation(s): 0 
Gene Names: aacA-aphDR015VRA0030
EC: 2.3.1 (PDB Primary Data), 2.7.1 (PDB Primary Data)
UniProt
Find proteins for P0A0C1 (Staphylococcus aureus)
Explore P0A0C1 
Go to UniProtKB:  P0A0C1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A0C1
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
GNP
Query on GNP

Download Ideal Coordinates CCD File 
E [auth A],
J [auth B],
N [auth C],
T [auth D]
PHOSPHOAMINOPHOSPHONIC ACID-GUANYLATE ESTER
C10 H17 N6 O13 P3
UQABYHGXWYXDTK-UUOKFMHZSA-N
KAN
Query on KAN

Download Ideal Coordinates CCD File 
F [auth A],
K [auth B],
O [auth C],
U [auth D]
KANAMYCIN A
C18 H36 N4 O11
SBUJHOSQTJFQJX-NOAMYHISSA-N
CL
Query on CL

Download Ideal Coordinates CCD File 
I [auth A],
S [auth C]
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
MG
Query on MG

Download Ideal Coordinates CCD File 
G [auth A]
H [auth A]
L [auth B]
M [auth B]
P [auth C]
G [auth A],
H [auth A],
L [auth B],
M [auth B],
P [auth C],
Q [auth C],
R [auth C],
V [auth D],
W [auth D]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.169 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 89.43α = 90
b = 99.22β = 105.46
c = 93.51γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
iMOSFLMdata reduction
Aimlessdata scaling
Cootmodel building
REFMACphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-05-25
    Type: Initial release
  • Version 1.1: 2016-06-15
    Changes: Database references
  • Version 1.2: 2023-09-27
    Changes: Data collection, Database references, Derived calculations, Refinement description