Abstract：
:High uptake of malate and efficient distribution of intracellular malate to organelles contributed to biomass increase, reducing maintenance energy. In this study, transgenic Chlamydomonas reinhardtii was developed that stably expresses malate synthase in the chloroplast. The strains under glyoxylate treatment showed 19% more increase in microalgal biomass than wild-type. By RNA analysis, transcript levels of malate dehydrogenase (MDH4) and acetyl-CoA synthetase (ACS3), isocitrate lyase (ICL1) and malate synthase (MAS1), were significantly more expressed (17%, 42%, 24%, and 18% respectively), which was consistent with reported heterotrophic metabolism flux analysis with the objective function maximizing biomass. Photosynthetic Fv/Fm was slightly reduced. A more meticulous analysis is necessary, but, in the transgenic microalgae with malate synthase overexpression, the metabolism is likely to more rely on heterotrophic energy production via TCA cycle and glyoxylate shunt than on photosynthesis, resulting in the increase in microalgal biomass.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Paik SM,Kim J,Jin E,Jeon NLdoi
10.1016/j.biortech.2018.10.029subject
Has Abstractpub_date
2019-01-01 00:00:00pages
594-598eissn
0960-8524issn
1873-2976pii
S0960-8524(18)31450-0journal_volume
272pub_type
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