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. 2017 Sep 27;292(46):18951–18960. doi: 10.1074/jbc.M117.805192

Figure 6.

Figure 6.

A proposed model of LHCSR3-dependent NPQ in PSII—LHCII–LHCSR3 supercomplexes of C. reinhardtii. A, a proposed molecular model of LHCSR3-dependent quenching within the PSII—LHCII–LHCSR3 supercomplex. The structural model of LHCSR3 is a sequence homology-based structural model of LHCSR3 generated by SWISS-MODEL and the orientations of chlorophylls are from a crystal structure of LHCII (70). B, LHCSR3 is expressed and associated with the PSII supercomplex under high-light conditions. The circles of orange dots represent the presumable binding site of LHCSR3. The binding of LHCSR3 to the PSII supercomplex inhibits the excitation energy transfer to CP43. At acidic pH, LHCSR3-dependent NPQ is activated, and it quenches excitation energy of LHCs. NPQ values of PSII–LHCII and PSII—LHCII–LHCSR3 were calculated from the difference between pH 7.5 and 5.5 conditions. The illustration of PSII supercomplex is based on data from Refs. 71 and 72.