The Effect of Spo0 Mutations on the Expression of Spo0A- and Spo0F-lacZ Fusions

Overview

Journal Mol Gen Genet

Specialties Genetics
Molecular Biology

Date 1986 Oct 1

PMID 3099127

Citations 29

Authors

S Yamashita

H Yoshikawa

F Kawamura

H Takahashi

T Yamamoto

Y Kobayashi

H Saito

Affiliations

Soon will be listed here.

Abstract

We have constructed spo0A-lacZ and spo0F-lacZ fusions with a temperate phage vector and have investigated how spo0 gene products are involved in the expression of each of these genes. The expression of spo0A-lacZ and spo0F-lacZ was stimulated at about the time of cessation of vegetative growth in Spo+ cells. This stimulation of spo0A-lacZ was impaired by mutations in the spo0B, D, E, F or H genes but was not affected by mutations in the spo0J or K genes. Similar results were obtained with the spo0F-lacZ fusion. The effect of the spo0A mutation on spo0A-lacZ expression was characteristic: the spo0A-directed beta-galactosidase activity found during vegetative growth was significantly enhanced in the spo0A mutant. This result suggests that spo0A gene expression is auto-regulated being repressed by its own gene product. Another remarkable observation was the effect of the sof-1 mutation, which is known to be a spo0A allele; it suppressed the sporulation deficiency of spo0B, spo0D and spo0F mutants. The spo0A-lacZ stimulation, which is impaired by any one of these spo0 mutations, was restored by the additional sof-1 mutation.

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