Localized Induction of the  ntcA  Regulatory Gene in Developing Heterocysts of  Anabaena  sp. Strain PCC 7120

descriptionPublicationkeyboard_double_arrow_right Article 15 Sep 2006 Spain English Publisher:American Society for MicrobiologyJournal:Journal of Bacteriology, volume 188, pages 6,694-6,699 (issn: 0021-9193, eissn: 1098-5530,

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Authors: Olmedo Verd, Elvira de; Muro Pastor, Alicia María; Flores García, Enrique; Herrero Moreno, Antonia;

doi: 10.1128/jb.00509-06

pmid: 16952962

pmc: PMC1595470

handle: 10261/111751 , 11441/62965

Localized Induction of the ntcA Regulatory Gene in Developing Heterocysts of Anabaena sp. Strain PCC 7120

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Abstract

ABSTRACT The ntcA gene encodes an N-control transcriptional regulator in cyanobacteria. In the N 2 -fixing, heterocyst-forming cyanobacterium Anabaena sp. strain PCC 7120, ntcA is an autoregulatory gene that is transcribed from a complex promoter region that includes a constitutive promoter (P 2 ) and promoters that are induced upon N step-down (P 1 and P 3 ). Expression of ntcA was investigated with the use of an ntcA-gfp translational fusion, which was introduced both in the natural ntcA locus and in a heterologous genomic place. Induction of ntcA-gfp took place after N step-down in all the cells of the filament, but at especially high levels in developing heterocysts. Localized induction could be driven independently by P 3 and P 1 .

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Spain

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Keywords

Bacterial Proteins, Microscopy, Fluorescence, Nitrogen, Green Fluorescent Proteins, Gene Expression Regulation, Bacterial, Transcription Initiation Site, Promoter Regions, Genetic, Anabaena, Artificial Gene Fusion, Transcription Factors

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