Active transport of glucosylglycerol is involved in salt adaptation of the cyanobacterium Synechocystis sp. strain PCC 6803

Article Abstract:

The process of salt adaptation in Synechocystis 6803 is aided by an active uptake system of osmoprotective compound glucosylglycerol (GG). GG uptake rate is five times higher in salt-adapted cells than in control cells. In the former, GG is synthesized de novo and gets accumulated in concentrations corresponding to external salinity for photosynthesis and growth restoration under high salt conditions. GG uptake is dependent on metabolic energy and is inhibited by uncouplers, and a combination of darkness and KCN. Trehalose and sucrose compete with GG for uptake.

Biological transport, Adaptation (Biology), Evolutionary adaptation, Salt, Salt (Food)

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Stress responses of Synechocystis sp. strain PCC 6803 mutants impaired in genes encoding putative alternative sigma factors

Article Abstract:

Results demonstrate that group 3 sigma-factors are involved in cyanobacterial acclimation ability to environmental stresses as shown by gene mutation study. Data show that mutants exhibit varying degrees of acclimatization to stress mediated by stress-stimulated proteins.

United States, Genetic aspects, Stress (Physiology), Heat shock proteins, Environmental engineering

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Multiple evidence for widespread and general occurence of type-III PHA synthases in cyanobacteria and molecular characterization of the PHA synthases from two thermophilic cyanobacteria: chlorogloeopsis fritschii PCC 6912 and Synechococcus sp. strain MA19

Article Abstract:

Research has been conducted on the cyanobacteria. The abilities of these bacteria to synthesize poly-3-hydroxybutyrate and poly-beta-hydroxyalkanoic acid synthase that accounts for the synthesis of this polyester have been investigated and reported.

Analysis, Acids, Microbiological research, Polyesters

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