Characterization of the Rhodocyclus tenuis photosynthetic reaction center
نویسندگان
چکیده
منابع مشابه
Electron transfer in the photosynthetic reaction center.
Photosynthesis occurs via electron transfer between pigment molecules or prosthetic groups embedded in a thylakoid membrane protein complex. These pigments form the “conductive pathway” for electron flow and the surrounding protein serves as a“shaping insulator”. Electron transfer through the protein proceeds via quantum tunneling into succesively lower potential wells represented by the pigmen...
متن کاملCharacterization of Reaction Center-B875 Complex of Rhodocyclus gelatinosus: Q B Site Properties Derived from Reconstitution Experiments
Purified reaction center-B875 pigment-protein complex isolated from Rc. gelatinosus (I. Agalidis, E. Rivas, and F. Reiss-Husson, Photosynth. Res. 23, 249 -2 5 5 (1990)) was further characterized. In the chromatophores, the quinone content was shown to be 6 menaquinones 8 and 16 ubiquinones 8 per reaction center, indicating that the pool contained both quinone types. Besides the primary (M KS) a...
متن کاملModeling charge transfer in the photosynthetic reaction center.
In this work, we present a model to elucidate the unidirectionality of the primary charge-separation process in the bacterial reaction centers. We have used a model of three sites/molecules with electron transfer beginning at site 1 with an option to proceed to site 2 or site 3. We used a stochastic model with arbitrary correlation functions. We get the quantum yields of electron escape via the...
متن کاملKinetic limitations in turnover of photosynthetic bacterial reaction center protein
The membrane-bound reaction center from purple nonsulfur photosynthetic bacterium Rhodobacter sphaeroides performs light-induced charge separation and exports two molecules of oxidized cytochrome and one molecule of fully reduced quinone (quinol) from two opposite (periplasmic and cytoplasmic) sites of the protein during a single turnover. The rate of the turnover was measured based on cytochro...
متن کاملPrimary charge-recombination in an artificial photosynthetic reaction center.
Photoinduced primary charge-separation and charge-recombination are characterized by a combination of time-resolved optical and EPR measurements of a fullerene-porphyrin-linked triad that undergoes fast, stepwise charge-separation processes. The electronic coupling for the energy-wasting charge recombination is evaluated from the singlet-triplet electronic energy gap in the short-lived, primary...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Biochimica et Biophysica Acta (BBA) - Bioenergetics
سال: 1997
ISSN: 0005-2728
DOI: 10.1016/s0005-2728(97)00045-5