3I0O

Crystal Structure of Spectinomycin Phosphotransferase, APH(9)-Ia, in complex with ADP and Spectinomcyin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.229 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure of the antibiotic resistance factor spectinomycin phosphotransferase from Legionella pneumophila.

Fong, D.H.Lemke, C.T.Hwang, J.Xiong, B.Berghuis, A.M.

(2010) J.Biol.Chem. 285: 9545-9555

  • DOI: 10.1074/jbc.M109.038364
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Aminoglycoside phosphotransferases (APHs) constitute a diverse group of enzymes that are often the underlying cause of aminoglycoside resistance in the clinical setting. Several APHs have been extensively characterized, including the elucidation of t ...

    Aminoglycoside phosphotransferases (APHs) constitute a diverse group of enzymes that are often the underlying cause of aminoglycoside resistance in the clinical setting. Several APHs have been extensively characterized, including the elucidation of the three-dimensional structure of two APH(3') isozymes and an APH(2'') enzyme. Although many APHs are plasmid-encoded and are capable of inactivating numerous 2-deoxystreptmaine aminoglycosides with multiple regiospecificity, APH(9)-Ia, isolated from Legionella pneumophila, is an unusual enzyme among the APH family for its chromosomal origin and its specificity for a single non-2-deoxystreptamine aminoglycoside substrate, spectinomycin. We describe here the crystal structures of APH(9)-Ia in its apo form, its binary complex with the nucleotide, AMP, and its ternary complex bound with ADP and spectinomycin. The structures reveal that APH(9)-Ia adopts the bilobal protein kinase-fold, analogous to the APH(3') and APH(2'') enzymes. However, APH(9)-Ia differs significantly from the other two types of APH enzymes in its substrate binding area and that it undergoes a conformation change upon ligand binding. Moreover, kinetic assay experiments indicate that APH(9)-Ia has stringent substrate specificity as it is unable to phosphorylate substrates of choline kinase or methylthioribose kinase despite high structural resemblance. The crystal structures of APH(9)-Ia demonstrate and expand our understanding of the diversity of the APH family, which in turn will facilitate the development of new antibiotics and inhibitors.


    Organizational Affiliation

    Department of Biochemistry, McGill University, Montreal, Quebec, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Spectinomycin phosphotransferase
A
339Legionella pneumophilaMutation(s): 0 
Gene Names: aph
Find proteins for O06916 (Legionella pneumophila)
Go to UniProtKB:  O06916
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ADP
Query on ADP

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Download CCD File 
A
ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N
 Ligand Interaction
SMI
Query on SMI

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Download CCD File 
A
SPECTINOMYCIN
(2R,4aR,5aR,6S,7S,8R,9S,9aR,10aS)-2-methyl-6,8-bis(methylamino)hexahydro-2H-pyrano[2,3-b][1,4]benzodioxine-4,4,4a,7,9(3H,10aH)-pentol
C14 H26 N2 O8
JEBSYFSDBYNEEU-GOZOPVAMSA-N
 Ligand Interaction
MG
Query on MG

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Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
NI
Query on NI

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Download CCD File 
A
NICKEL (II) ION
Ni
VEQPNABPJHWNSG-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.229 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 75.008α = 90.00
b = 75.008β = 90.00
c = 139.941γ = 120.00
Software Package:
Software NamePurpose
CNSrefinement
HKL-2000data scaling
PHASERphasing
CBASSdata collection
HKL-2000data reduction

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-01-19
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance