Abstract:
:The transcription factors sinR and abrB are involved in the control of sporulation initiation in Bacillus subtilis. We identified a single homologue to sinR and three highly similar homologues to abrB, designated abrB310, abrB1941, and abrB3647, in Clostridium acetobutylicum ATCC 824. Using reporter vectors, we showed that the promoters of abrB1941 and abrB3647 were not active under the growth conditions tested. The abrB310 promoter was strongly active throughout growth and exhibited a transient elevation of expression at the onset of solventogenesis. Primer extension assays showed that two transcripts of abrB310 and a single, extremely weak transcript for sinR are expressed. Potential -35 and -10 consensus motifs are readily identifiable surrounding the transcription start sites of abrB310 and sinR, with a single putative 0A box present within the promoter of abrB310. In strains of C. acetobutylicum transformed with plasmids to elevate sinR expression or decrease sinR expression, no significant differences in growth or in acid or solvent production were observed compared to the control strains. In C. acetobutylicum strain 824(pAS310), which expressed an antisense RNA construct targeted against abrB310, the acids acetate and butyrate accumulated to approximately twice the normal concentration. This accumulation corresponded to a delay and decrease in acetone and butanol production. It was also found that sporulation in strain 824(pAS310) was delayed but that the morphology of sporulating cells and spores was normal. Based upon these observations, we propose that abrB310 may act as a regulator at the transition between acidogenic and solventogenic growth.
journal_name
Appl Environ Microbioljournal_title
Applied and environmental microbiologyauthors
Scotcher MC,Rudolph FB,Bennett GNdoi
10.1128/AEM.71.4.1987-1995.2005keywords:
subject
Has Abstractpub_date
2005-04-01 00:00:00pages
1987-95issue
4eissn
0099-2240issn
1098-5336pii
71/4/1987journal_volume
71pub_type
杂志文章abstract::A soy sauce koji mold, Aspergillus flavus var. columnaris Raper and Fennel (ATCC 44310), was treated with UV irradiation to obtain mutant strains possessing high protease activities, high amylase activities, and light-colored conidia. Selected mutant strains were tested for toxicity, and some were found acutely toxic ...
journal_title:Applied and environmental microbiology
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doi:10.1128/AEM.53.8.1980-1982.1987
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journal_title:Applied and environmental microbiology
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journal_title:Applied and environmental microbiology
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更新日期:2006-03-01 00:00:00
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pub_type: 杂志文章
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更新日期:1976-12-01 00:00:00
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更新日期:1977-07-01 00:00:00
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pub_type: 杂志文章
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更新日期:2001-12-01 00:00:00
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journal_title:Applied and environmental microbiology
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更新日期:1994-02-01 00:00:00
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journal_title:Applied and environmental microbiology
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更新日期:1983-03-01 00:00:00
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journal_title:Applied and environmental microbiology
pub_type: 杂志文章
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更新日期:1994-12-01 00:00:00
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journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.46.2.532-532.1983
更新日期:1983-08-01 00:00:00
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journal_title:Applied and environmental microbiology
pub_type: 杂志文章
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更新日期:2011-03-01 00:00:00
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journal_title:Applied and environmental microbiology
pub_type: 杂志文章
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