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Cyanobacterial energy storage is tightly controlled by circadian clock
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SYSNO ASEP 0365075 Document Type C - Proceedings Paper (int. conf.) R&D Document Type The record was not marked in the RIV Title Cyanobacterial energy storage is tightly controlled by circadian clock Author(s) Červený, Jan (UEK-B) RID, ORCID, SAI Number of pages 15 s. Action Congress of the International Society for Applied Phycology /4./ Event date 19.06.-24.06.2011 VEvent location Halifax Country CA - Canada Event type WRD Language eng - English Keywords circadian oscillator ; Cyanothece ; model ; glycogen ; biotechnology Subject RIV EH - Ecology, Behaviour CEZ AV0Z60870520 - UEK-B (2005-2011) Annotation The metabolism of the unicellular, nitrogen fixing cyanobacterium Cyanothece sp. exhibits strong circadian regulation that has profound implications on biomass composition. The optical density measured at 735 nm was stable during rapid morning chlorophyll accumulation, and then, increased in the early afternoon towards a peak, followed by a rapid decline towards the late night steady state. We propose that these dynamics largely reflect accumulation and subsequent consumption of glycogen granules. To explore the dynamics of the link between respiration and circadian oscillations, we extrapolated an earlier model of the KaiABC oscillator from Synechococcus el. to Cyanothece sp. Measured respiratory activity correlated strongly in its timing and proportions with the modeled accumulation of the KaiB4 complex, which marks the late afternoon phase of the circadian clock. These dramatic metabolic events are shown to limit optimal harvest time in biotechnological applications to a particular day phase. Workplace Global Change Research Institute Contact Nikola Šviková, svikova.n@czechglobe.cz, Tel.: 511 192 268 Year of Publishing 2012
Number of the records: 1