1887

Abstract

An extensive screening for transcripts with probes specific for the genes in a 108 kb region from to of the chromosome led to identification of an operon, , the expression of which was initiated at the second hour of sporulation and in a σ-dependent manner. Among three genes in the operon, deletion of the gene, which is predicted to encode a protein product of 468 residues with five membrane-spanning domains, resulted in a large decrease in numbers of chloroform-, lysozyme- and heat-resistant spores, compared to findings with the wild-type strain. Electron microscopy revealed that development of the spore cortex was blocked in the mutant. In addition, although the spore coat was visible, the inner coat layer of the mutant seemed partially detached from the outer coat. In sporangia of the strains harbouring an in-frame fusion of the green fluorescent protein gene to , fluorescence was detected around the forespore. This localization did not depend on SpoIVA or on CotE functions, both of which determine proper localization of coat proteins and cortex formation. The deletion did not affect expression of genes involved in cortex synthesis. These results suggest that the YabQ protein localizes in the membrane of the forespore and plays an important role in cortex formation.

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2001-04-01
2020-09-28
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