Primary light harvesting system: the relationship of phycobilisomes to Photosystem I and II. Progress report, September 1983-May 1985. [Porphyridium cruentum]
The association of phycobilisomes, the primary photosynthetic antennae systems in red algae and cyanobacteria, with Photosystem II, previously expected from energy transfer measurements, has now been established. Photosystem-II-phycobilisome particles from the red alga Porphyridium cruentum were isolated. These particles lack photosystem I components, have high O/sub 2/-evolution rates, which are sensitive to DCMU and are abolished by 10 mM hydroxylamine. The phycobilisomes were functionally attached, since green light which is absorbed by phycoerythrin was most effective in driving O/sub 2/-evolution and 2,6-dichlorophenol indophenol reduction. The majority of the particles appear by electron microscopy to retain small membrane fragments at their base. Selective removal of the phycobilisome components results in the enrichment of a 50 kD polypeptide which is considered to be the putative photosystem II reaction center. 14 refs.
- Research Organization:
- Smithsonian Institution, Rockville, MD (USA). Smithsonian Environmental Research Center
- DOE Contract Number:
- AS05-76ER04310
- OSTI ID:
- 5155513
- Report Number(s):
- DOE/ER/04310-T4; ON: DE86001635
- Country of Publication:
- United States
- Language:
- English
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Primary light harvesting system: the relationship of phycobilisomes to photosystem I and II. Progress report, September 1983-March 1984
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Related Subjects
59 BASIC BIOLOGICAL SCIENCES
PHYCOBILISOMES
ELECTROPHORESIS
MOLECULAR STRUCTURE
ALGAE
ELECTRON MICROSCOPY
PHOTOSYNTHETIC REACTION CENTERS
PHYCOCYANIN
CELL CONSTITUENTS
MICROSCOPY
PIGMENTS
PLANTS
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