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

In the filamentous cyanobacterium Calothrix PCC 7504, which fixes N 2 aerobically, the modification state of the regulatory P II 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 fo...

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Published inFEMS microbiology letters Vol. 144; no. 2; pp. 185 - 190
Main Authors Liotenberg, Sylviane, Campbell, Douglas, Castets, Anne-Marie, Houmard, Jean, de Marsac, Nicole Tandeau
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.11.1996
Subjects
Calothrix PCC 7504
Calothrix PCC 7601
Carbon assimilation
Cell differentiation
Nitrogen assimilation
Post-translational modification
Calothrix PCC 7504
Post-translational modification
Calothrix PCC 7601
Carbon assimilation
Cell differentiation
Nitrogen assimilation
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Summary:In the filamentous cyanobacterium Calothrix PCC 7504, which fixes N 2 aerobically, the modification state of the regulatory P II 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 P II isoforms differed somewhat between the two strains. In another strain, Calothrix PCC 7601, which has lost the capability to fix N 2, P II was modified only if ammonia plus an inhibitor of glutamine synthetase were present. It is proposed that: (i) the behavior of the P II proteins depends upon the physiological properties of the strains; and (ii) the modification system of P II per se may differ between the two cyanobacterial genera.
ISSN:0378-1097
1574-6968
DOI:10.1016/0378-1097(96)00360-6