Cylindrical Phycobilisomes from a Blue-Green Alga, Anabaena variabilis

概要

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Cylindrical 52.5-nm-long phycobilisomes were observed in Anabaena variabilis, differing from the generally accepted hemidiscoidal morphology. The central part of such a phycobilisome has a network-like fine structure of slightly greater diameter (16 nm) than the connected end parts of stacked-disc structure (12 nm in diameter). On the basis of this morphology, the molecular mass of this phycobilisome was calculated to be 3.27×10^6, about 60% of which is accounted for by phycocyanin with the rest being due to allophycocyanin. Separately prepared 23 S allophycocyanin particles with a molecular mass of 1.13×10^6 have the dimensions (16×23 nm) and network-like fine structure similar to the central part of phycobilisomes, while an aggregate form of phycocyanin (18 S) has a fine structure of stacked discs similar to the connecting end part of phycobilisomes, suggesting that the central part constitutes the core at which these phycobilisomes attach to the thylakoid membranes.
日本植物生理学会の論文