PMID: 812869Feb 1, 1976

Magnesium and anion requirements of rodB mutants of Bacillus subtilis

Journal of Bacteriology
H J RogersR S Buxton


rodB mutants of Bacillus subtilis have been found to require several hundred-fold more Mg2+ in a minimal growth medium than the wild type to achieve rapid growth. In the presence of all concentrations of Cl-, the organisms grow as deformed cocci, but with 10 mM Mg2+ and Br-, I-, or NO3- present they grow as rods. The morphology is then directly under the control of the concentration of both Mg2+ and anion. Originally, it was found that L-glutamic acid in the medium brought about the change from deformed spheres to rods. This amino acid will similarly function at a much lower concentration when the higher concentrations of Mg2+ and Cl- are also present. At a constant concentration of L-glutamate, the morphology can be controlled by varying the Mg2+ concentration. In the presence of Mg2+ and I-, the morphological change is temperature sensitive. At 30 C rods are formed and at 42 C deformed cocci are formed. The requirement of a rodB mutant for a high concentration of magnesium and the round morphology have been shown to be most probably due to a single mutation.


Oct 24, 1977·Molecular & General Genetics : MGG·M G Sargent
Feb 13, 2009·Nature·Mark LeaverJeff Errington
Mar 9, 2005·Molecular Microbiology·Alex Formstone, Jeffery Errington
Dec 13, 2006·Microbiology and Molecular Biology Reviews : MMBR·Rut Carballido-López
Aug 17, 2005·Molecular Microbiology·George C Stewart
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Related Concepts

Natto Bacteria
Chloride Ion Level
Glutamic Acids
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