1887

Abstract

The genes are essential for maintaining the outer membrane integrity and detergent resistance in various Gram-negative bacteria, including . The role of TolA has been well established for the bile resistance of subsp. serovar Typhimurium. We compared the bile resistance pattern between the serovars Typhi and Typhimurium and observed that Typhi is more resistant to bile-mediated damage. A closer look revealed a significant difference in the TolA sequence between the two serovars which contributes to the differential detergent resistance. The knockout of both the serovars behaves completely differently in terms of membrane organization and morphology. The role of the Pal proteins and difference in LPS organization between the two serovars were verified and were found to have no direct connection with the altered bile resistance. In normal Luria broth (LB), Typhi Δ is filamentous while Typhimurium Δ grows as single cells, similar to the wild-type. In low osmolarity LB, however, Typhimurium Δ started chaining and Typhi Δ showed no growth. Further investigation revealed that the chaining phenomenon observed was the result of failure of the outer membrane to separate in the dividing cells. Taken together, the results substantiate the evolution of a shorter TolA in Typhi to counteract high bile concentrations, at the cost of lower osmotic tolerance.

Funding
This study was supported by the:
  • Director of Indian Institute of Science, Bangalore, India (Award grant Provision (2A) Tenth Plan (191/MCB))
  • Department of Biotechnology (Award DBT 172 and DBT 197)
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2011-05-01
2024-04-18
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