Modification of the pIIprotein in response to carbon and nitrogen availability in filamentous heterocystous cyanobacteria

Autor:	A M Castets, Nicole Tandeau de Marsac, Sylviane Liotenberg, Douglas A. Campbell, Jean Houmard
Rok vydání:	1996
Předmět:	Cyanobacteria biology Strain (chemistry) Nitrogen assimilation fungi macromolecular substances Metabolism biology.organism_classification Synechococcus Microbiology Biochemistry Glutamine synthetase Genetics Nitrogen fixation bacteria Molecular Biology Bacteria
Zdroj:	FEMS Microbiology Letters. 144:185-190
ISSN:	1574-6968 0378-1097
DOI:	10.1111/j.1574-6968.1996.tb08528.x
Popis:	In the filamentous cyanobacterium Calothrix PCC 7504, which fixes N2 aerobically, the modification state of the regulatory PII protein (GlnB) was shown to depend on nitrogen and carbon availability, as observed in the unicellular non-fixing strain Synechococcus PCC 7942. However, the conditions for modifications, the time dependence of the process and the electrophoretic behavior of the native PII isoforms differed somewhat between the two strains. In another strain, Calothrix PCC 7601, which has lost the capability to fix N2, PII was modified only if ammonia plus an inhibitor of glutamine synthetase were present. It is proposed that: (i) the behavior of the PII proteins depends upon the physiological properties of the strains; and (ii) the modification system of PII per se may differ between the two cyanobacterial genera.
Databáze:	OpenAIRE
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