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. 1992 Mar 1;89(5):1899–1903. doi: 10.1073/pnas.89.5.1899

Dark induction of zeaxanthin-dependent nonphotochemical fluorescence quenching mediated by ATP.

A M Gilmore 1, H Y Yamamoto 1
PMCID: PMC48561  PMID: 1542689

Abstract

Zeaxanthin-dependent nonphotochemical fluorescence quenching is a light-induced activity in plants that apparently protects against the potentially damaging effects of excess light. We report a dark-induced nonphotochemical quenching in thylakoids of Lactuca sativa L. cv. Romaine mediated by ATP. This effect is due to low lumen pH from hydrolysis-dependent proton pumping and hence required an active ATPase. The induction was optimal at 0.3 mM ATP, a physiological concentration, and occurred under conditions of little or no reverse electron flow. The properties of ATP-induced quenching were in all respects examined similar to light-induced quenching, including antimycin inhibition of quenching induction but not delta pH. We conclude that zeaxanthin-dependent quenching depends directly on lumen pH and that the role of light is indirect. Although it is known that zeaxanthin and low lumen pH are insufficient for quenching to occur, the results apparently exclude the redox state of an electron-transport carrier or formation of light-induced carotenoid triplets as a further requirement. We propose that a slow pH-dependent conformational change together with zeaxanthin cause static quenching in the pigment bed; possibly antimycin inhibits this change. Furthermore, we suggest from the ability of ATP to sustain quenching in the dark for extended periods that persistent or slowly reversible zeaxanthin quenching often observed in vivo may be due to sustained delta pH from ATP hydrolysis.

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Selected References

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