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Literature DB >> 1763033

Mechanism of the initial charge separation in bacterial photosynthetic reaction centers.

C K Chan¹, T J DiMagno, L X Chen, J R Norris, G R Fleming.

Abstract

The initial electron transfer in reaction centers from Rhodobacter sphaeroides R26 was studied by a subpicosecond transient pump-probe technique. The measured kinetics at various wavelengths were analyzed and compared with several mechanisms for electron transfer. An unambiguous determination of the initial electron transfer mechanism in reaction centers cannot be made by studying the anion absorption region (640-690 nm), due to the spectral congestion in this region. However, correlations between the stimulated emission decay of the excited state of the special pair, P*, at 926 nm and bleaching of the bacteriopheophytin Qx absorption at 545 nm suggest that the electron transfer at 283 K is dominated by a two-step sequential mechanism, whereas one-step superexchange and the two-step sequential mechanism have about equal contributions at 22 K.

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Year: 1991 PMID： 1763033 PMCID： PMC53102 DOI： 10.1073/pnas.88.24.11202

Source DB: PubMed Journal: Proc Natl Acad Sci U S A ISSN： 0027-8424 Impact factor: 11.205

16 in total

1. Evidence that a distribution of bacterial reaction centers underlies the temperature and detection-wavelength dependence of the rates of the primary electron-transfer reactions.

Authors: C Kirmaier; D Holten
Journal: Proc Natl Acad Sci U S A Date: 1990-05 Impact factor: 11.205

2. Initial electron-transfer in the reaction center from Rhodobacter sphaeroides.

Authors: W Holzapfel; U Finkele; W Kaiser; D Oesterhelt; H Scheer; H U Stilz; W Zinth
Journal: Proc Natl Acad Sci U S A Date: 1990-07 Impact factor: 11.205

3. Femtosecond spectroscopy of electron transfer in the reaction center of the photosynthetic bacterium Rhodopseudomonas sphaeroides R-26: Direct electron transfer from the dimeric bacteriochlorophyll primary donor to the bacteriopheophytin acceptor with a time constant of 2.8 +/- 0.2 psec.

Authors: J L Martin; J Breton; A J Hoff; A Migus; A Antonetti
Journal: Proc Natl Acad Sci U S A Date: 1986-02 Impact factor: 11.205

4. Femtosecond spectroscopy of excitation energy transfer and initial charge separation in the reaction center of the photosynthetic bacterium Rhodopseudomonas viridis.

Authors: J Breton; J L Martin; A Migus; A Antonetti; A Orszag
Journal: Proc Natl Acad Sci U S A Date: 1986-07 Impact factor: 11.205

5. Direct observation of vibrational coherence in bacterial reaction centers using femtosecond absorption spectroscopy.

Authors: M H Vos; J C Lambry; S J Robles; D C Youvan; J Breton; J L Martin
Journal: Proc Natl Acad Sci U S A Date: 1991-10-15 Impact factor: 11.205

6. An assessment of the mechanism of initial electron transfer in bacterial reaction centers.

Authors: C Kirmaier; D Holten
Journal: Biochemistry Date: 1991-01-22 Impact factor: 3.162

7. Primary charge separation in bacterial photosynthesis: oxidized chlorophylls and reduced pheophytin.

Authors: J Fajer; D C Brune; M S Davis; A Forman; L D Spaulding
Journal: Proc Natl Acad Sci U S A Date: 1975-12 Impact factor: 11.205

8. Charge separation in a reaction center incorporating bacteriochlorophyll for photoactive bacteriopheophytin.

Authors: C Kirmaier; D Gaul; R DeBey; D Holten; C C Schenck
Journal: Science Date: 1991-02-22 Impact factor: 47.728

9. Electron acceptors of bacterial photosynthetic reaction centers. II. H+ binding coupled to secondary electron transfer in the quinone acceptor complex.

Authors: C A Wraight
Journal: Biochim Biophys Acta Date: 1979-11-08

10. X-ray structure analysis of a membrane protein complex. Electron density map at 3 A resolution and a model of the chromophores of the photosynthetic reaction center from Rhodopseudomonas viridis.

Authors: J Deisenhofer; O Epp; K Miki; R Huber; H Michel
Journal: J Mol Biol Date: 1984-12-05 Impact factor: 5.469

14 in total

10. Primary electron transfer kinetics in bacterial reaction centers with modified bacteriochlorophylls at the monomeric sites BA,B.

Authors: U Finkele; C Lauterwasser; A Struck; H Scheer; W Zinth
Journal: Proc Natl Acad Sci U S A Date: 1992-10-15 Impact factor: 11.205

Mechanism of the initial charge separation in bacterial photosynthetic reaction centers.

1. Evidence that a distribution of bacterial reaction centers underlies the temperature and detection-wavelength dependence of the rates of the primary electron-transfer reactions.

2. Initial electron-transfer in the reaction center from Rhodobacter sphaeroides.

3. Femtosecond spectroscopy of electron transfer in the reaction center of the photosynthetic bacterium Rhodopseudomonas sphaeroides R-26: Direct electron transfer from the dimeric bacteriochlorophyll primary donor to the bacteriopheophytin acceptor with a time constant of 2.8 +/- 0.2 psec.

4. Femtosecond spectroscopy of excitation energy transfer and initial charge separation in the reaction center of the photosynthetic bacterium Rhodopseudomonas viridis.

5. Direct observation of vibrational coherence in bacterial reaction centers using femtosecond absorption spectroscopy.

6. An assessment of the mechanism of initial electron transfer in bacterial reaction centers.

7. Primary charge separation in bacterial photosynthesis: oxidized chlorophylls and reduced pheophytin.

8. Charge separation in a reaction center incorporating bacteriochlorophyll for photoactive bacteriopheophytin.

9. Electron acceptors of bacterial photosynthetic reaction centers. II. H+ binding coupled to secondary electron transfer in the quinone acceptor complex.

10. X-ray structure analysis of a membrane protein complex. Electron density map at 3 A resolution and a model of the chromophores of the photosynthetic reaction center from Rhodopseudomonas viridis.

1. The accessory bacteriochlorophyll: a real electron carrier in primary photosynthesis.

2. Energy trapping and detrapping in reaction center mutants from Rhodobacter sphaeroides.

3. Femtosecond spontaneous-emission studies of reaction centers from photosynthetic bacteria.

4. Comparative study of reaction centers from purple photosynthetic bacteria: Isolation and optical spectroscopy.

5. Long-time quantum simulation of the primary charge separation in bacterial photosynthesis.

6. Ab initio calculation of electronic coupling in the photosynthetic reaction center.

7. A nonadiabatic theory for ultrafast catalytic electron transfer: a model for the photosynthetic reaction center.

8. Dynamical theory of primary processes of charge separation in the photosynthetic reaction center.

9. Femtosecond photodichroism studies of isolated photosystem II reaction centers.

10. Primary electron transfer kinetics in bacterial reaction centers with modified bacteriochlorophylls at the monomeric sites BA,B.