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2016 ; 6
(ä): 33024
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Different strategies of metabolic regulation in cyanobacteria: from
transcriptional to biochemical control
#MMPMID27611502
Jablonsky J
; Papacek S
; Hagemann M
Sci Rep
2016[Sep]; 6
(ä): 33024
PMID27611502
show ga
Cyanobacteria Synechococcus sp. PCC 7942 and Synechocystis sp. PCC 6803 show
similar changes in the metabolic response to changed CO2 conditions but exhibit
significant differences at the transcriptomic level. This study employs a systems
biology approach to investigate the difference in metabolic regulation of
Synechococcus sp. PCC 7942 and Synechocystis sp. PCC 6803. Presented multi-level
kinetic model for Synechocystis sp. PCC 6803 is a new approach integrating and
analysing metabolomic, transcriptomic and fluxomics data obtained under high and
ambient CO2 levels. Modelling analysis revealed that higher number of different
isozymes in Synechocystis 6803 improves homeostatic stability of several
metabolites, especially 3PGA by 275%, against changes in gene expression,
compared to Synechococcus sp. PCC 7942. Furthermore, both cyanobacteria have the
same amount of phosphoglycerate mutases but Synechocystis 6803 exhibits only ~20%
differences in their mRNA levels after shifts from high to ambient CO2 level, in
comparison to ~500% differences in the case of Synechococcus sp. PCC 7942. These
and other data imply that the biochemical control dominates over transcriptional
regulation in Synechocystis 6803 to acclimate central carbon metabolism in the
environment of variable inorganic carbon availability without extra cost carried
by large changes in the proteome.