Cell division genes ftsQAZ in Escherichia coli require distant cis-acting signals upstream of ddlB for full expression.
Mol Microbiol
; 30(2): 305-15, 1998 Oct.
Article
en En
| MEDLINE
| ID: mdl-9791176
A transcriptional reporter fusion has been introduced into the chromosomal ftsZ locus in such a way that all transcription that normally reaches ftsZ can be monitored. The new Phi(ftsZ-lacZ ) fusion yields four times more beta-galactosidase activity than a ddlB-ftsQAZ-lacZ fusion on a lambda prophage vector. A strongly polar ddlB ::Omega insertion prevents contributions from signals upstream of the ftsQAZ promoters and decreases transcription of the chromosomal Phi(ftsZ-lacZ ) fusion by 66%, demonstrating that around two-thirds of total ftsZ transcription require cis-acting elements upstream of ddlB. We suggest that those elements are distant promoters, and thus that the cell division and cell wall synthesis genes in the dcw gene cluster are to a large extent co-transcribed. The ddlB ::Omega insertion is lethal unless additional copies of ftsQA are provided or a compensatory decrease in FtsZ synthesis is made. This shows that ddlB is a dispensable gene, and reinforces the critical role of the FtsA/FtsZ ratio in septation. Using the new reporter fusion, it is demonstrated that ftsZ expression is not autoregulated.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Proteínas Bacterianas
/
Regulación Bacteriana de la Expresión Génica
/
Proteínas de Escherichia coli
/
Proteínas del Citoesqueleto
/
Escherichia coli
/
Proteínas de la Membrana
Idioma:
En
Revista:
Mol Microbiol
Asunto de la revista:
BIOLOGIA MOLECULAR
/
MICROBIOLOGIA
Año:
1998
Tipo del documento:
Article
País de afiliación:
España
Pais de publicación:
Reino Unido