0441189 - ÚVGZ 2015 RIV GB eng J - Článek v odborném periodiku
Valledor, Luis - Furuhashi, T. - Recuenco-Muňoz, L. - Wienkoop, S. - Weckwerth, W.
System-level network analysis of nitrogen starvation and recovery in Chlamydomonas reinhardtii reveals potential new targets for increased lipid accumulation.
Biotechnology for Biofuels. Roč. 7, č. 171 (2014), s. 1-17. ISSN 1754-6834. E-ISSN 1754-6834
Institucionální podpora: RVO:67179843
Klíčová slova: chlamydomonas reinhardtii * lipid accumulation * nitrogen
Kód oboru RIV: EI - Biotechnologie a bionika
Impakt faktor: 6.044, rok: 2014 ; AIS: 1.945, rok: 2014
DOI: https://doi.org/10.1186/s13068-014-0171-1

We have studied the molecular changes involved in the adaptive mechanisms to N starvation and full recovery of the vegetative cells in the microalga Chlamydomonas reinhardtii during a four-day time course. High throughput mass spectrometry was employed to integrate the proteome and the metabolome with physiological changes. N starvation led to an accumulation of oil bodies and reduced Fv/Fm.. Distinct enzymes potentially participating in the carbon-concentrating mechanism (CAH7, CAH8, PEPC1) are strongly accumulated. The membrane composition is changed, as indicated by quantitative lipid profiles. A reprogramming of protein biosynthesis was observed by increased levels of cytosolic ribosomes, while chloroplastidic were dramatically reduced. Readdition of N led to, the identification of early responsive proteins mediating stress recovery, indicating their key role in regaining and sustaining normal vegetative growth. Analysis of the data with multivariate correlation analysis, Granger causality, and sparse partial least square (sPLS) provided a functional network perspective of the molecular processes. Cell growth and N metabolism were clearly linked by the branched chain amino acids, suggesting an important role in this stress. Lipid accumulation was also tightly correlated to the COP II protein, involved in vesicle and lysosome coating, and a major lipid droplet protein. This protein, together with other key proteins mediating signal transduction and adaption (BRI1, snRKs), constitute a series of new metabolic and regulatory targets.Conclusions: This work not only provides new insights and corrects previous models by analyzing a complex dataset, but also increases our biochemical understanding of the adaptive mechanisms to N starvation in Chlamydomonas, pointing to new bioengineering targets for increased lipid accumulation, a key step for a sustainable and profitable microalgae-based biofuel production.
Trvalý link: http://hdl.handle.net/11104/0244269