Molecular basis of light harvesting and photoprotection in CP24: unique features of the most recent antenna complex.

ABSTRACT: CP24 is a minor antenna complex of Photosystem II, which is specific for land plants. It has been proposed that this complex is involved in the process of excess energy dissipation, which protects plants from photodamage in high light conditions. Here, we have investigated the functional architecture of the complex, integrating mutation analysis with time-resolved spectroscopy. A comprehensive picture is obtained about the nature, the spectroscopic properties, and the role in the quenching in solution of the pigments in the individual binding sites. The lowest energy absorption band in the chlorophyll a region corresponds to chlorophylls 611/612, and it is not the site of quenching in CP24. Chlorophylls 613 and 614, which are present in the major light-harvesting complex of Photosystem app

SUBMITTER: Passarini F 

PROVIDER: S-EPMC2785587 | biostudies-literature | 2009 Oct

REPOSITORIES: biostudies-literature