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Anacystis nidulans accumulates large amounts of guanosine 3'-diphosphate-5'-diphosphate (ppGpp) upon nutritional or energy starvation induced by light-to-dark shift, treatment with carbonylcyanide-m-chlorophenylhydrazone (an uncoupler), or treatment with L-methionine-DL-sulfoximine (an inducer of nitrogen starvation). In contrast to healthy A. nidulans cells, those infected by AS-1 cyanophage do not respond with ppGpp accumulation when starved after about one-third of the complete infection cycle, except, to some extent, under extreme conditions when both nitrogen deprivation and energy deprivation are induced simultaneously (darkening plus L-methionine-DL-sulfoximine treatment). In contrast to cyanophage infection in Anacystis, infection with T4 phage of Escherichia coli CP 78 cells does not affect their accumulation of ppGpp under treatments identical with or similar to those applied in the experiments with Anacystis. This difference in response of phage-infected heterotrophic and photoautotrophic cells to starvation seems to reflect differences in control of nutritional or energy metabolism rather than differences in ability to synthesize ppGpp.

journal of bacteriology

Bacteriophage infection interferes with guanosine 3'-diphosphate-5'-diphosphate accumulation induced by energy and nitrogen starvation in the cyanobacterium Anacystis nidulans