Adenosine Kinase of
Trypanosoma brucei
and Its Role in Susceptibility to Adenosine Antimetabolites
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Published:2007-11
Issue:11
Volume:51
Page:3895-3901
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ISSN:0066-4804
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Container-title:Antimicrobial Agents and Chemotherapy
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language:en
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Short-container-title:Antimicrob Agents Chemother
Author:
Lüscher Alexandra1, Önal Pinar1, Schweingruber Anne-Marie1, Mäser Pascal1
Affiliation:
1. Institute of Cell Biology, University of Bern, Bern, Switzerland
Abstract
ABSTRACT
Trypanosoma brucei
cannot synthesize purines de novo and relies on purine salvage from its hosts to build nucleic acids. With adenosine being a preferred purine source of bloodstream-form trypanosomes, adenosine kinase (AK; EC 2.7.1.20) is likely to be a key player in purine salvage. Adenosine kinase is also of high pharmacological interest, since for many adenosine antimetabolites, phosphorylation is a prerequisite for activity. Here, we cloned and functionally characterized adenosine kinase from
T. brucei
(TbAK). Tb
AK
is a tandem gene, expressed in both procyclic- and bloodstream-form trypanosomes, whose product localized to the cytosol of the parasites. The RNA interference-mediated silencing of Tb
AK
suggested that the gene is nonessential under standard growth conditions. Inhibition or downregulation of Tb
AK
rendered the trypanosomes resistant to cordycepin (3′-deoxyadenosine), demonstrating a role for TbAK in the activation of adenosine antimetabolites. The expression of Tb
AK
in
Saccharomyces cerevisiae
complemented a null mutation in the adenosine kinase gene
ado1
. The concomitant expression of Tb
AK
with the
T. brucei
adenosine transporter gene Tb
AT1
allowed
S. cerevisiae ado1 ade2
double mutants to grow on adenosine as the sole purine source and, at the same time, sensitized them to adenosine antimetabolites. The coexpression of Tb
AK
and Tb
AT1
in
S. cerevisiae ado1 ade2
double mutants proved to be a convenient tool for testing nucleoside analogues for uptake and activation by
T. brucei
adenosine salvage enzymes.
Publisher
American Society for Microbiology
Subject
Infectious Diseases,Pharmacology (medical),Pharmacology
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