Phycoerythrin Association with Photosystem II in the Cryptophyte Alga Rhodomonas salinaстатья
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Дата последнего поиска статьи во внешних источниках: 25 ноября 2020 г.
Аннотация:Cryptophyte algae belong to a special group of oxygenic photosynthetic organisms containing pigment combinationunique for plastids – phycobiliproteins and chlorophyll a/c-containing antenna. Despite the progress in investigationof morphological and ecological features, as well as genome-based systematics of cryptophytes, their photosynthetic apparatusremains poorly understood. The ratio of the photosystems (PS)s I and II is unknown and information on participationof the two antennal complexes in functions of the two photosystems is inconsistent. In the present work we demonstratedfor the first time that the cryptophyte alga Rhodomonas salina had the PSI to PSII ratio in thylakoid membranes equal to1 : 4, whereas this ratio in cyanobacteria and higher plants was known to be 3 : 1 and 1 : 1, respectively. Furthermore, it wasestablished that contrary to the case of cyanobacteria the phycobiliprotein antenna represented by phycoerythrin-545 (PE-545) in R. salina was associated only with the PSII, which indicated specific spatial organization of these protein pigmentswithin the thylakoids that did not facilitate interaction with the PSI.