3LOO

Crystal structure of Anopheles gambiae adenosine kinase in complex with P1,P4-di(adenosine-5) tetraphosphate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.201 

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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

A High-Affinity Adenosine Kinase from Anopheles gambiae.

Cassera, M.B.Ho, M.C.Merino, E.F.Burgos, E.S.Rinaldo-Matthis, A.Almo, S.C.Schramm, V.L.

(2011) Biochemistry 50: 1885-1893

  • DOI: https://doi.org/10.1021/bi101921w
  • Primary Citation of Related Structures:  
    3LOO

  • PubMed Abstract: 

    Genome analysis revealed a mosquito orthologue of adenosine kinase in Anopheles gambiae (AgAK; the most important vector for the transmission of Plasmodium falciparum in Africa). P. falciparum are purine auxotrophs and do not express an adenosine kinase but rely on their hosts for purines. AgAK was kinetically characterized and found to have the highest affinity for adenosine (K(m) = 8.1 nM) of any known adenosine kinase. AgAK is specific for adenosine at the nucleoside site, but several nucleotide triphosphate phosphoryl donors are tolerated. The AgAK crystal structure with a bound bisubstrate analogue Ap(4)A (2.0 Å resolution) reveals interactions for adenosine and ATP and the geometry for phosphoryl transfer. The polyphosphate charge is partly neutralized by a bound Mg(2+) ion and an ion pair to a catalytic site Arg. The AgAK structure consists of a large catalytic core in a three-layer α/β/α sandwich, and a small cap domain in contact with adenosine. The specificity and tight binding for adenosine arise from hydrogen bond interactions of Asn14, Leu16, Leu40, Leu133, Leu168, Phe168, and Thr171 and the backbone of Ile39 and Phe168 with the adenine ring as well as through hydrogen bond interactions between Asp18, Gly64, and Asn68 and the ribosyl 2'- and 3'-hydroxyl groups. The structure is more similar to that of human adenosine kinase (48% identical) than to that of AK from Toxoplasma gondii (31% identical). With this extraordinary affinity for AgAK, adenosine is efficiently captured and converted to AMP at near the diffusion limit, suggesting an important role for this enzyme in the maintenance of the adenine nucleotide pool. mRNA analysis verifies that AgAK transcripts are produced in the adult insects.


  • Organizational Affiliation

    Department of Biochemistry, Albert Einstein College of Medicine, Yeshiva University, Bronx, New York 10461, United States.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Anopheles gambiae adenosine kinase
A, B, C
365Anopheles gambiaeMutation(s): 0 
EC: 2.7.1.20
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
B4P
Query on B4P

Download Ideal Coordinates CCD File 
D [auth A],
G [auth B],
J [auth C]
BIS(ADENOSINE)-5'-TETRAPHOSPHATE
C20 H28 N10 O19 P4
YOAHKNVSNCMZGQ-XPWFQUROSA-N
CL
Query on CL

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

Download Ideal Coordinates CCD File 
E [auth A],
H [auth B],
K [auth C]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Binding Affinity Annotations 
IDSourceBinding Affinity
B4P PDBBind:  3LOO Ki: 860 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.201 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.381α = 90
b = 76.813β = 92.12
c = 140.515γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
CBASSdata collection
HKL-2000data reduction
HKL-2000data scaling
MOLREPphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-02-02
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2024-02-21
    Changes: Data collection, Database references, Derived calculations