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2015 ; 83
(4
): 1276-85
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Burkholderia pseudomallei type III secretion system cluster 3 ATPase BsaS, a
chemotherapeutic target for small-molecule ATPase inhibitors
#MMPMID25605762
Gong L
; Lai SC
; Treerat P
; Prescott M
; Adler B
; Boyce JD
; Devenish RJ
Infect Immun
2015[Apr]; 83
(4
): 1276-85
PMID25605762
show ga
Melioidosis is an infectious disease of high mortality for humans and other
animal species; it is prevalent in tropical regions worldwide. The pathogenesis
of melioidosis depends on the ability of its causative agent, the Gram-negative
bacterium Burkholderia pseudomallei, to enter and survive in host cells. B.
pseudomallei can escape from the phagosome into the cytosol of phagocytic cells
where it replicates and acquires actin-mediated motility, avoiding killing by the
autophagy-dependent process, LC3 (microtubule-associated protein light chain
3)-associated phagocytosis (LAP). The type III secretion system cluster 3 (TTSS3)
facilitates bacterial escape from phagosomes, although the mechanism has not been
fully elucidated. Given the recent identification of small-molecule inhibitors of
the TTSS ATPase, we sought to determine the potential of the predicted TTSS3
ATPase, encoded by bsaS, as a target for chemotherapeutic treatment of infection.
A B. pseudomallei bsaS deletion mutant was generated and used as a control
against which to assess the effect of inhibitor treatment. Infection of RAW 264.7
cells with wild-type bacteria and subsequent treatment with the ATPase inhibitor
compound 939 resulted in reduced intracellular bacterial survival, reduced escape
from phagosomes, and increased colocalization with both LC3 and the lysosomal
marker LAMP1 (lysosome-associated membrane protein 1). These changes were similar
to those observed for infection of RAW 264.7 cells with the bsaS deletion mutant.
We propose that treatment with the ATPase inhibitor compound 939 decreased
intracellular bacterial survival through a reduced ability of bacteria to escape
from phagosomes and increased killing via LAP. Therefore, small-molecule
inhibitors of the TTSS3 ATPase have potential as therapeutic treatments against
melioidosis.