What is the relationship between Synechocystis energy storage compounds?

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Cyanobacteria are ecologically important phototrophic bacteria capable of oxygenic photosynthesis. Cyanobacteria synthetize many interesting metabolites such as glycogen, lipids, carotenoids or polyhydroxyalkanoates (PHA). Glycogen is the most common energy storage molecule in cyanobacteria followed by PHA, which serve primarily as carbon and energy source and occur in form of intracellular granules. PHA probably don’t serve only as an energy source, but might help cyanobacteria to survive stress conditions, since increased PHA synthesis was observed during the cultivation under stress conditions. PHA are biodegradable, biocompatibile with similar properties as petrochemical plastics. It has been reported that more than 70 % of carbon in PHA comes from glycogen, this turnover happens during darkness period. In this work we kept an eye on these two compounds in two cyanobacetrial strains from Synechosyctis family. PHA levels were analysed via GC-FID, glycogen levels via HPLC. It showed that not only darkness but also cultivation conditions affect the levels of both storage compounds. In the tube multicultivator where the gas exchange is more effective, the levels of compounds behaved as expected, on the other hand during cultivation in Erlenmayer flasks the trend wasn’t observed. Better understanding of metabolism of these energy storage compound could help to improve PHA production in cyanobacteria.

Synechocystis, storage compounds

ŠEDRLOVÁ, Z.; DRINKA, J. OBRUČA, S.

1. 9. 2022

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