Two-electron gates in photosynthesis
Conference
·
OSTI ID:6524446
Principals underlying the design of naturally occurring electron gates in the photosynthetic apparatus of green plants and photosynthetic bacteria are discussed and related to molecular electronics. A pair of quinones participates in election transfer on the reducing side of photosystem II of green plants and the photosystem found in purple photosynthetic bacteria. The quinones are photochemically reduced by electron transfers from the primary events of photosynthesis. In each quinone, there are 2 binding sites, Q1 and Q2. The quinones Q1 and Q2 are non-covalently bound to intrinsic membrane protein. Also, in both systems there is a pool of quinones of the same chemical structure which are outside the photosystem, but reside in the same membrane. Protons move from aqueous solution outside the photosynthetic membrane onto the quinone-protein complex as electrons are pumped to the quinones. The rate of proton uptake is almost two-orders of magnitude slower than electron transfer rate. Electron transfer from Q1 to Q2 is temperature dependent. Problems arising in biomimetic molecular systems are discussed. (DMC)
- Research Organization:
- Argonne National Lab., IL (USA)
- OSTI ID:
- 6524446
- Report Number(s):
- CONF-8103158-2; ON: DE83007779
- Country of Publication:
- United States
- Language:
- English
Similar Records
Primary events of photosynthesis
Identification, isolation, and sequence of the reaction center protein genes of the photosynthetic purple bacterium Rhodopseudomonas capsulata
Evolution of photosynthetic and respiratory prokaryotes and organelles
Conference
·
Wed Dec 31 23:00:00 EST 1980
·
OSTI ID:6337065
Identification, isolation, and sequence of the reaction center protein genes of the photosynthetic purple bacterium Rhodopseudomonas capsulata
Conference
·
Sun Jul 01 00:00:00 EDT 1984
·
OSTI ID:6653125
Evolution of photosynthetic and respiratory prokaryotes and organelles
Journal Article
·
Fri Feb 27 23:00:00 EST 1981
· Ann. N.Y. Acad. Sci.; (United States)
·
OSTI ID:5047922
Related Subjects
14 SOLAR ENERGY
140505 -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
AROMATICS
CARBOXYLIC ACIDS
CHEMICAL BONDS
CHEMICAL REACTIONS
CHLOROPHYLL
ELECTRON TRANSFER
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
KINETICS
MEMBRANES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PHOTOSYNTHETIC BACTERIA
PHOTOSYNTHETIC MEMBRANES
PHOTOSYNTHETIC REACTION CENTERS
PHYTOCHROMES
PIGMENTS
PLANTS
PORPHYRINS
QUINONES
SYNTHESIS
140505 -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
AROMATICS
CARBOXYLIC ACIDS
CHEMICAL BONDS
CHEMICAL REACTIONS
CHLOROPHYLL
ELECTRON TRANSFER
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
KINETICS
MEMBRANES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PHOTOSYNTHETIC BACTERIA
PHOTOSYNTHETIC MEMBRANES
PHOTOSYNTHETIC REACTION CENTERS
PHYTOCHROMES
PIGMENTS
PLANTS
PORPHYRINS
QUINONES
SYNTHESIS