Transcription level analysis of intracellular Burkholderia pseudomallei illustrates the role of BPSL1502 during bacterial interaction with human lung epithelial cells

Teerasit Techawiwattanaboon; Tanachaporn Bartpho; Rasana Wongratanacheewin Sermswan; Sorujsiri Chareonsudjai

doi:10.1007/s12275-015-4522-9

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Transcription level analysis of intracellular Burkholderia pseudomallei illustrates the role of BPSL1502 during bacterial interaction with human lung epithelial cells: Teerasit Techawiwattanaboon ^1,2, Tanachaporn Bartpho ², Rasana Wongratanacheewin Sermswan ^2,3, Sorujsiri Chareonsudjai ^1,2; Journal of Microbiology 2015;53(2):134-140.
DOI: https://doi.org/10.1007/s12275-015-4522-9
Published online: January 28, 2015

¹Department of Microbiology, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand, ²Melioidosis Research Center, Khon Kaen University, Khon Kaen, Thailand, ³Department of Biochemistry, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand¹Department of Microbiology, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand, ²Melioidosis Research Center, Khon Kaen University, Khon Kaen, Thailand, ³Department of Biochemistry, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand

Corresponding author: Sorujsiri Chareonsudjai , Tel: +66-43-363808,

Received: 22 September 2014 • Revised: 10 November 2014 • Accepted: 5 December 2014

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Abstract

Melioidosis caused by Burkholderia pseudomallei is a globally important disease of increasing concern according to high
case
-fatality rate and epidemic spreading. The ability of B. pseudomallei to attach and invade host cells and subsequently survive intracellularly has stimulated many questions concerning the comprehension of bacterial pathogenesis progression. Transcription levels of intracellular B. pseudomallei genes in human lung epithelial cells were therefore analyzed using bioinformatic tools, RT-PCR and real time RT-PCR. Here, it is reported that the identification of bpsl1502, encoding B. pseudomallei SurE (stationary phase survival protein E) located in a global transcriptional regulation operon was accomplished. The up-regulation of B. pseudomallei SurE was demonstrated during intracellular survival of A549 cells at 12, 18, and 24 h post-infection. To investigate the role of this protein, a B. pseudomallei SurE defective mutant was constructed. The invasion and initial survival of the SurE mutants within the A549 cells were impaired. There was no difference, however, between the growth of B. pseudomallei SurE mutant as compared to the wild type in Luria-Bertani culture. These data suggest that SurE may assist B. pseudomallei host cells invade and facilitate early intracellular infection but is not crucial during the stationary growth phase. The identification of B. pseudomallei SurE provides more information of bacterial strategy during an early step of the pathogenesis process of melioidosis.

Keywords: BPSL1502;B. pseudomallei;transcription level analysis

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Transcription level analysis of intracellular Burkholderia pseudomallei illustrates the role of BPSL1502 during bacterial interaction with human lung epithelial cells

J. Microbiol. 2015;53(2):134-140. Published online January 28, 2015

DOI: https://doi.org/10.1007/s12275-015-4522-9

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