Cyanoglobule lipid droplet accumulation as a stress response to nitrogen starvation in a non-N2-fixing mutant strain of Anabaena sp. PCC 7120.

ABSTRACT: Cyanoglobules are lipid droplets of cyanobacteria that share compositional and functional features with plastoglobules of plant chloroplasts. However, their roles in stress physiology remain poorly defined, particularly in filamentous cyanobacteria. Here, we characterize cyanoglobule dynamics and composition during nitrogen starvation in a non-diazotrophic derivative of Anabaena sp. PCC 7120. This experimental context enables analysis of sustained nitrogen deprivation in vegetative cells without the transient and heterogeneous effects of heterocyst differentiation and nitrogenase activity, while recognizing that the strain does not represent wild-type physiology. Nitrogen starvation induced striking morphological remodeling, including increased cyanoglobule size and abundance. Proteomic an

SUBMITTER: Susanto FA 

PROVIDER: S-EPMC12923008 | biostudies-literature | 2026

REPOSITORIES: biostudies-literature