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 in | FEMS microbiology letters Vol. 144; no. 2; pp. 185 - 190 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
01.11.1996
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Subjects | |
Online Access | Get full text |
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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. |
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ISSN: | 0378-1097 1574-6968 |
DOI: | 10.1016/0378-1097(96)00360-6 |