Primary light harvesting system: the relationship of phycobilisomes to Photosystem I and II. Progress report, September 1983-May 1985. [Porphyridium cruentum]

Technical Report · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5155513

Gantt, E

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

Related Subjects

14 SOLAR ENERGY
140505* -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
550200 -- Biochemistry
550700 -- Microbiology
59 BASIC BIOLOGICAL SCIENCES
ALGAE
CELL CONSTITUENTS
ELECTRON MICROSCOPY
ELECTROPHORESIS
MICROSCOPY
MOLECULAR STRUCTURE
PHOTOSYNTHETIC REACTION CENTERS
PHYCOBILISOMES
PHYCOCYANIN
PIGMENTS
PLANTS