Site, trigger, quenching mechanism and recovery of non-photochemical quenching in cyanobacteria: recent updates
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Cyanobacteria exhibit a novel form of non-photochemical quenching (NPQ) at the level of the phycobilisome. NPQ is a process that protects photosystem II (PSII) from possible highlight-induced photo-damage. Although significant advancement has been made in understanding the NPQ, there are still some missing details. This critical review focuses on how the orange carotenoid protein (OCP) and its partner fluorescence recovery protein (FRP) control the extent of quenching. What is and what is not known about the NPQ is discussed under four subtitles; where does exactly the site of quenching lie? (site), how is the quenching being triggered? (trigger), molecular mechanism of quenching (quenching) and recovery from quenching. Finally, a recent working model of NPQ, consistent with recent findings, is been described.
KeywordsCyanobacteria Non-photochemical quenching Orange carotenoid protein Phycobilisome Fluorescence recovery protein
Ravi R Sonani is deeply thankful to the Department of Science and Technology (DST), New Delhi, Indo-French Centre for the Promotion of Advance Research (IFCPAR), New Delhi and British Council for the financial support. Datta Madamwar acknowledges University Grants Commission (UGC), New Delhi for BSR Faculty Grant.
Compliance with ethical standards
Conflict of interest
The authors report no conflicts of interest.
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