Abstract
Free fatty acids (FFA) generated in cyanobacterial cells can be utilized for the biodiesel that is required for our sustainable future. The combination of FFA and strong light induces severe photoinhibition of photosystem II (PSII), which suppresses the production of FFA in cyanobacterial cells. In the present study, we examined the effects of exogenously added FFA on the photoinhibition of PSII in Synechocystis sp. PCC 6803. The addition of lauric acid (12:0) to cells accelerated the photoinhibition of PSII by inhibiting the repair of PSII and the de novo synthesis of D1. α-Linolenic acid (18:3) affected both the repair of and photodamage to PSII. Surprisingly, palmitic (16:0) and stearic acids (18:0) enhanced the repair of PSII by accelerating the de novo synthesis of D1 with the mitigation of the photoinhibition of PSII. Our results show chemical potential of FFA in the regulation of PSII without genetic manipulation.
Highlights
Our sustainable future depends on new sources of renewable energy instead of limited petroleum
Further investigation of the effect of Free fatty acids (FFA) on cellular growth reports that the sensitivity of cyanobacteria to extracellular FFA is improved in the aas mutant [12,13]
These results suggest that inhibitory effects of FFA on the cellular growth and photosynthesis occur when FFA are activated as acyl-ACP
Summary
Our sustainable future depends on new sources of renewable energy instead of limited petroleum. In an aas mutant of Synechococcus, increased amounts of FFA inhibit cellular growth and accelerate the photoinhibition of PSII by accelerating the rate of photodamage to PSII [11]. Further investigation of the effect of FFA on cellular growth reports that the sensitivity of cyanobacteria to extracellular FFA is improved in the aas mutant [12,13] These results suggest that inhibitory effects of FFA on the cellular growth and photosynthesis occur when FFA are activated as acyl-ACP. Palmitic (16:0) and stearic acids (18:0) alleviated the photoinhibition of PSII by enhancing the repair of PSII via the accelerating synthesis of D1. From these observations, we report here the FFA-related photoinhibition by affecting the de novo synthesis of D1
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