8d ago
A CO2-limitation-induced cytosolic repressor enables shutdown of the algal CO2-concentrating mechanism
Miichi · S. · Shimamura · D. · Yasuda · J. · Tokutsu · R. · +2 more
Abstract
Aquatic photosynthetic organisms face limited CO2 availability because CO2 diffuses slowly in water and most dissolved inorganic carbon (Ci) exists as HCO3- at physiological pH. To overcome this limitation, aquatic photoautotrophs operate CO2-concentrating mechanisms (CCMs) that elevate CO2 around Rubisco and sustain carbon fixation. Because CCM operation consumes energy, it must be suppressed when CO2 becomes abundant, but how this shutdown occurs remains poorly understood. In Chlamydomonas rei
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