Abstract
The light-harvesting chlorophyll a/b-binding protein complexes of photosystem II (PSII) are a family of pigment-proteins accounting for the majority of PSII chlorophyll (chi) and protein in the thylakoid membrane. They bind chl a and b and the xanthophylls lutein, violaxanthin, neoxanthin, antheraxanthin and zeaxanthin. The main chl a/bprotein complex of PSII — LHCII — acts primarily as light-harvesting antenna but was found to be involved also in thylakoid adhesion and the acclimation of photosynthetic apparatus to short -term and prolonged changes in the light regime. Besides LHCII at least three minor chl a/b-proteins are found in PSII particles, i.e. CP29, CP26 and CP24. These complexes function as intermediates in transfer of excitation energy form LHCII to PSII core although they may also serve as sites of thermal deactivation of excess excitation energy within PSII.
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