A Mechanical Model For Growth And Control of the Cell Wall of Rod-shaped Bacteria
Unlike animal cells, bacteria have no cytoskeleton. Shape maintenance and, to some extent, cell-cycle regulation are governed by the cell wall. The walls of many rod-shaped bacteria are continuously added to on the inside surface, at the cytoplasmic membrane, and continuously depleted at the outer surface by the action of autolytic enzymes. The walls are stretched longitudinally as the cells grow, but the cell diameter and wall thickness remain remarkably constant during normal growth (Trueba and Woldringh, 1980). This also is a regulatory problem, but one that depends heavily on mechanical behaviour.
KeywordsBacillus Subtilis Turgor Pressure Teichoic Acid Hoop Direction Wall Growth
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- Cole RM, Popkin TJ, Boylan RJ and Mendelson NH (1970) Ultrastructure of a temperature sensitive rod-mutant of Bacillus subtilis. J Bacteriol. 103, 793–810Google Scholar
- Doyle RJ, Matthews TH and Streips UN (1980) Chemical basis for selectivity of metal ions by the Bacillus subtilis cell wall. J Bacteriol 143, 471–480Google Scholar
- Mendelson NH and Favre D (1987) Regulation of Bacillus subtilis. macrofiber twist development by ions. J Bacteriol 169, 519–525Google Scholar
- Merad T, Archibald AR, Hancock JC, Harwood CR and Hobot J (1989) Cell wall assembly in Bacillus subtilis: vizualisation of old and new wall material by electron-microscopic examination of samples stained selectively for teichoic acid and teichuronic acid. J Gen Microbiol 135, 645–655Google Scholar
- Mitchell P and Moyle J (1956) Osmotic function and structure in bacteria. Symp Soc Gen Microbiol 6, 150–180Google Scholar
- Poole HM (1976a) turnover and spreading of old wall during surface growth of Bacillus subtilis.. J Bacteriol 125,1127–1138Google Scholar
- Pooley HM (1976b) Layered distribution according to age within the cell wall of Bacillus subtilis. J Bacteriol 125, 1139–1147Google Scholar
- Thwaites JJ (1993) Growth and control of the cell wall: a mechanical model for Bacillus subtilis.. In Bacterial growth and lysis ( de Pedro MA, ed) Plenum, New YorkGoogle Scholar
- Thwaites JJ and Surana UC (1991) Mechanical properties of Bacillus subtilis. cell walls: effects of removing residual culture mediumJ Bacteriol] 173, 197–203Google Scholar
- Trueba FJ and Woldringh CL (1980) Changes in cell diameter during the division cycle of Escherichia coli. J Bacteriol 142, 869–879Google Scholar