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

Abstract 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 condit...

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Bibliographic Details
Published in:FEMS microbiology letters 1996-11, Vol.144 (2-3), p.185-190
Main Authors: Liotenberg, Sylviane, Campbell, Douglas, Castets, Anne-Marie, Houmard, Jean, de Marsac, Nicole Tandeau
Format: Article
Language:English
Subjects:
Ammonia
Bacteriology
Biological and medical sciences
Calothrix
Calothrix PCC 7504
Calothrix PCC 7601
Carbon
Carbon assimilation
Cell differentiation
Cyanobacteria
Fundamental and applied biological sciences. Psychology
Glutamate-ammonia ligase
Glutamine
Isoforms
Metabolism. Enzymes
Microbiology
Nitrogen
Nitrogen assimilation
PII protein
Post‐translational modification
Proteins
Time dependence
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Summary:Abstract 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.
ISSN:0378-1097
1574-6968
DOI:10.1111/j.1574-6968.1996.tb08528.x