1887

Abstract

In unicellular non-diazotrophic cyanobacteria, NblA is a small polypeptide required for phycobilisome degradation during macronutrient limitation. In the filamentous N-fixing sp., a gene () lies upstream of the operon that encodes phycoerythrin apoproteins. Using a specific anti-NblAI antibody it was found that in strains of sp. NblAI abundance increases under nitrogen-limiting conditions but the protein is also present in cells grown in nitrogen-replete medium. Gold immunolabelling experiments showed that, upon a nitrogen shift-down, NblAI is preferentially located in the differentiated heterocysts, where O evolution has to be shut off for nitrogenase to operate. The results lead to the proposal that NblAI is a necessary ‘cofactor’ but not the triggering factor that governs phycobilisome degradation in sp.

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2004-05-01
2019-11-20
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