Transcription regulation by tandem-bound FNR at Escherichia coli promoters.
J Bacteriol
; 185(20): 5993-6004, 2003 Oct.
Article
en En
| MEDLINE
| ID: mdl-14526010
ABSTRACT
FNR is an Escherichia coli transcription factor that regulates the transcription of many genes in response to anaerobiosis. We have constructed a series of artificial FNR-dependent promoters, based on the melR promoter, in which a consensus FNR binding site was centered at position -41.5 relative to the transcription start site. A second consensus FNR binding site was introduced at different upstream locations, and promoter activity was assayed in vivo. FNR can activate transcription from these promoters when the upstream FNR binding site is located at many different positions. However, sharp repression is observed when the upstream-bound FNR is located near positions -85 or -95. This repression is relieved by the FNR G74C substitution mutant, previously identified as being defective in transcription repression at the yfiD promoter. A parallel series of artificial FNR-dependent promoters, carrying a consensus FNR binding site at position -61.5 and a second upstream DNA site for FNR, was also constructed. Again, promoter activity was repressed by FNR when the upstream-bound FNR was located at particular positions.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Transcripción Genética
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ADN Bacteriano
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Regulación Bacteriana de la Expresión Génica
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Regiones Promotoras Genéticas
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Proteínas de Escherichia coli
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Escherichia coli
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Proteínas Hierro-Azufre
Tipo de estudio:
Prognostic_studies
Idioma:
En
Revista:
J Bacteriol
Año:
2003
Tipo del documento:
Article
País de afiliación:
Reino Unido