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Regulation of the Bacterial Cell Wall: Analysis of a Mutant of Bacillus subtilis Defective in Biosynthesis of Teichoic Acid

^a Department of Microbiology, University of Rochester School of Medicine and Dentistry, Rochester, New York 14642, and Department of Microbiology, University of Arizona, Tucson, Arizona 85721

ABSTRACT

Bacillus subtilis 168ts-200B is a temperature-sensitive mutant of B. subtilis 168 which grows as rods at 30 C but as irregular spheres at 45 C. Growth at the nonpermissive temperature resulted in a deficiency of teichoic acid in the cell wall. A decrease in teichoic acid synthesis coupled with the rapid turnover of this polymer led to a progressive loss until less than 20% of the level found in wild-type rods remained in spheres. Extracts of cells grown at 45 C contained amounts of the enzymes involved in the biosynthesis and glucosylation of teichoic acids that were equal to or greater than those found in normal rods. Cell walls of the spheres were deficient also in the endogenous autolytic enzyme (N-acyl muramyl-L-alanine amidase). Genetic analysis of the mutant by PBS1-mediated transduction and deoxyribonucleic acid-mediated transformation demonstrated that the lesion responsible for these effects (tag-1) is tightly linked to the genes which regulate the glucosylation of teichoic acid in the mid-portion of the chromosome of B. subtilis.

¹ Present address: Department of Medicine, University of Cambridge, Cambridge CB21QT, England.

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