title: Nitrogen-regulated group 2 sigma factor from Synechocystis sp. strain PCC 6803 involved in survival under nitrogen stress.
abstract: The expression of sll1689, an open reading frame from the cyanobacterium Synechocystis sp. strain PCC 6803 putatively encoding a member of the sigma(70) family of sigma factors, appears to be regulated by the nitrogen control transcription factor NtcA. Disruption of sll1689 had no noticeable effect on exponential growth, identifying its product as a member of the group 2, nonessential class of sigma(70)-like sigma factors; however, this disruption decreased the viability of the cells after long periods of nitrogen starvation. We have named this gene rpoD2-V. The expression of glnN, encoding a type III glutamine synthetase, was impaired in strains bearing an inactivated copy of the rpoD2-V gene.
authors.affiliation: Instituto de Bioquímica Vegetal y Fotosíntesis, Consejo Superior de Investigaciones Científicas-Universidad de Sevilla, E-41092 Seville, Spain. alicia@cica.es
authors.forename: A M
authors.initials: AM
authors.lastname: Muro-Pastor
authors.forename: A
authors.initials: A
authors.lastname: Herrero
authors.forename: E
authors.initials: E
authors.lastname: Flores
mesh_terms: D000220:Adaptation, Biological / Q000235:genetics*; D001426:Bacterial Proteins; D000458:Cyanobacteria / Q000235:genetics* / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000235:genetics; D012321:DNA-Directed RNA Polymerases / Q000235:genetics* / Q000378:metabolism; D015964:Gene Expression Regulation, Bacterial; D005974:Glutamate-Ammonia Ligase / Q000096:biosynthesis*; D016254:Mutagenesis, Insertional; D009584:Nitrogen / Q000378:metabolism*; D011401:Promoter Regions, Genetic; D012808:Sigma Factor / Q000235:genetics* / Q000378:metabolism; D014157:Transcription Factors / Q000235:genetics
chemical_list: D001426:Bacterial Proteins; D004268:DNA-Binding Proteins; D012808:Sigma Factor; D014157:Transcription Factors; C075617:ntcA protein, Synechococcus; C081775:RNA polymerase sigma 70; D012321:DNA-Directed RNA Polymerases; D005974:Glutamate-Ammonia Ligase; D009584:Nitrogen