Expression of Neisseria gonorrhoeae cell division genes ftsZ, ftsE and minD is influenced by environmental conditions.
Res Microbiol
; 152(9): 781-91, 2001 Nov.
Article
en En
| MEDLINE
| ID: mdl-11763238
ABSTRACT
The activity of the promoter regions of the cell division genes ftsZ, ftsE, minC, minD and minE from Neisseria gonorrhoeae (Ng) was studied under different environmental conditions using lacZ translational fusions. The promoters of the minNg genes have not been previously determined and we identified promoter regions upstream of each gene (minCp, minDp and minEp). We determined that minDp had the strongest activity. Expression of the promoter regions of ftSZ(Ng) and ftsE(Ng), which we had previously identified, as well as minD(Ng), were then studied under conditions reflecting the environment of the genitourinary tract. These conditions included anaerobiosis, presence of isoleucine or urea (3 mM and 400 mM, respectively) and acidity of pH 6. Both beta-galactosidase expression and northern blot analysis indicated that all three genes were upregulated under anaerobiosis. The addition of isoleucine as well as media at pH 6 did not have any significant effects on the promoter activity of these genes while the presence of urea significantly decreased ftsZ(Ng) promoter activity. The expression of the minD(Ng) promoter region was analyzed during different growth phases and shown to follow the growth behavior of the culture. By contrast, the ftSZ(Ng) promoter activity continued to rise after the onset of the stationary phase. When gonococcal ftsZ promoter 1, (Pz1) was altered by site-directed mutagenesis, a significant decrease in the expression of ftsZ(Ng) was observed under both aerobic and anaerobic conditions. These data infer that gonococci regulate their cell division in response to different environments.
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Banco de datos:
MEDLINE
Asunto principal:
Proteínas Bacterianas
/
Regulación Bacteriana de la Expresión Génica
/
Adenosina Trifosfatasas
/
Transportadoras de Casetes de Unión a ATP
/
Regulador de Conductancia de Transmembrana de Fibrosis Quística
/
Proteínas de Escherichia coli
/
Proteínas del Citoesqueleto
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Neisseria gonorrhoeae
Idioma:
En
Año:
2001
Tipo del documento:
Article