Archives of Microbiology

, Volume 186, Issue 5, pp 377–383

The synthesis and role of the mechanosensitive channel of large conductance in growth and differentiation of Bacillus subtilis

Original Paper

DOI: 10.1007/s00203-006-0152-2

Cite this article as:
Wahome, P.G. & Setlow, P. Arch Microbiol (2006) 186: 377. doi:10.1007/s00203-006-0152-2

Abstract

A translational lacZ fusion of the Bacillus subtilis mscL gene that encodes the mechanosensitive channel of large conductance (MscL) was expressed at significant levels during log phase growth of B. subtilis, and the level of mscLlacZ expression was increased 1.5-fold by growth in medium with high salt (1 M NaCl). However, in growth media with either low or high salt, mscLlacZ expression fell drastically beginning in the late log phase of growth, and fell to even lower levels during sporulation, although a significant amount of β-galactosidase from mscL to lacZ was accumulated in the developing spore. Deletion of mscL had no effect on B. subtilis growth, sporulation or subsequent spore germination. The ΔmscL strain also grew as well as the wild-type parental strain in medium with 1.2 M NaCl. While log phase wild-type cells grown with 1.2 M NaCl survived a rapid 0.9 M osmotic downshift, log phase ΔmscL cells rapidly lost viability and lysed when subjected to this same osmotic downshift. However, by the early stationary phase of growth, ΔmscL cells had become resistant to a 0.9 M osmotic downshift.

Keywords

Bacillus Sporulation Spore germination Mechanosensitive channels Osmoregulation 

Abbreviations

McsL

The mechanosensitive channel of large conductance

MS

Mechanosensitive

DPA

Dipicolinic acid

Ca–DPA

a 1:1 chelate of Ca2+ and DPA

MPa

MegaPascals

Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  1. 1.Department of Molecular, Microbial and Structural BiologyUniversity of Connecticut Health CenterFarmingtonUSA

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