Abstract:
:The sdiA gene codes for a protein that regulates expression of the ftsQAZ cluster of essential cell division genes of Escherichia coli. SdiA up-regulates the ftsQ2p promoter that initiates transcription into the ftsQAZ cluster. In this paper, we report that expression of sdiA is itself regulated by a factor that is released into the growth medium by E. coli. When medium that had previously supported growth of E. coli (conditioned medium) was used to support growth of an indicator E. coli strain that contained an sdiA-lacZ transcriptional reporter, there was a 50 to 80% decrease in sdiA expression as monitored by beta-galactosidase activity. The down-regulation of PsdiA was associated with a decrease in expression of the SdiA target promoter ftsQ2p, as monitored by expression of an ftsQ2p-lacZ transcriptional fusion. An effect of conditioned medium on ftsQ2p expression was not seen when the wild-type sdiA gene was disrupted by insertional mutagenesis, indicating that the effect on ftsQ2p expression was secondary to the down-regulation of PsdiA. Conditioned medium had no effect on expression of Plac, PrpoS, or several other promoters associated with the ftsQAZ gene cluster (ftsQ1p and ftsZ1-4p). This suggests that the response is specific for PsdiA and for promoters that are regulated by the sdiA gene product and that cell-to-cell signalling may play a role in regulating expression of this group of genes.
journal_name
J Bacterioljournal_title
Journal of bacteriologyauthors
García-Lara J,Shang LH,Rothfield LIdoi
10.1128/jb.178.10.2742-2748.1996subject
Has Abstractpub_date
1996-05-01 00:00:00pages
2742-8issue
10eissn
0021-9193issn
1098-5530journal_volume
178pub_type
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journal_title:Journal of bacteriology
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journal_title:Journal of bacteriology
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更新日期:1975-10-01 00:00:00
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pub_type: 杂志文章
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pub_type: 杂志文章
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pub_type: 杂志文章
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更新日期:1995-09-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.173.13.3966-3976.1991
更新日期:1991-07-01 00:00:00
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journal_title:Journal of bacteriology
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journal_title:Journal of bacteriology
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更新日期:1981-04-01 00:00:00
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journal_title:Journal of bacteriology
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更新日期:1971-06-01 00:00:00
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