Light Path of Carbon Reduction in Photosynthesis

Fong, Francis K.

doi:10.1007/978-3-642-81795-3_8

Cited by 5 publications

(6 citation statements)

References 128 publications

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“…1) werepartiallydeuteratedas determinedby IH-NMR performed on the isolated pigment molecules. The deuterationpattern wassimilarto that describedearlierfor BChl a/ 4 • I S i.e., protonsare mainlyfoundon the methylgroups (positions la, Sa,and 4b), whereasthe methinepositions (a, {3, 8) and the{3-protons (3,7,8) are highlydeuterated (see molecular diagram in Fig. Id).…”

Section: Results On P;60 In Rps Viridissupporting

confidence: 72%

“…The NH and OH bond lengths were given a standard value of 1.0 A24 as would be expected for the "long" heavy atom distances ofca. 3 Aseen by the X-ray analysis. However, the limited resolution of this intermediate refinement (2.9 Ar might require a more s0phisticated geometry optimization (e.g., by energy minimization) of these three hydrogen bridges, which has not been done in the present calculations.…”

Section: Primary Donor Cation Radical P9+romentioning

confidence: 98%

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Magnetic Resonance and Molecular Orbital Studies of the Primary Donor Cation Radical P^+.₉₆₀ in the Photosynthetic Bacterium Rhodopseudomonas viridis

Plato

Lubitz

Lendzian

et al. 1988

Israel Journal of Chemistry

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The light‐induced radical cation of the primary electron donor, P+.960, in photosynthetic reaction centers (RCs) from Rhodopseudomonas viridis has been investigated by various magnetic resonance techniques (ESR, ENDOR, TRIPLE). Comparison of the measured hyperfine couplings with those of the cation radical of monomeric bacteriochlorophyll b (BChl b) and with RHF‐INDO/SP molecular orbital calculations, performed on P+.960 using coordinates of an X‐ray structure analysis, consistently show an asymmetric distribution of the unpaired electron over the two BChl b molecules which constitute P960. The derived spin density ratio is 2.8 in favor of the dimer half bound to the L protein subunit. The possible relevance of this result for the primary electron transfer step in the RC is briefly discussed.

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Section: Results On P;60 In Rps Viridissupporting

confidence: 72%

Section: Primary Donor Cation Radical P9+romentioning

confidence: 98%

Magnetic Resonance and Molecular Orbital Studies of the Primary Donor Cation Radical P^+.₉₆₀ in the Photosynthetic Bacterium Rhodopseudomonas viridis

Plato

Lubitz

Lendzian

et al. 1988

Israel Journal of Chemistry

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“…It is interesting that in plant photosystems 1 and 2 the ESR spectra of the respective oxidized electron donors (P&, and P&b ) show a linewidth similar to that of oxidized monomeric chlorophyll a (Chl a") [ 3,28,38,39]. Consequently, monomeric Chl a species have already been proposed for P&i [ 381 and for P& [ 401.…”

Section: Acknowledgementmentioning

confidence: 99%

ESR, ENDOR and TRIPLE resonance studies of the primary donor radical cation P960+• in the photosynthetic bacterium Rhodopseudomonas viridis

Lendzian

Lubitz

Scheer³

et al. 1988

Chemical Physics Letters

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The light-induced radical cation of the primary electron donor P&b in photosynthetic reaction centers from Rhodopseudomonus viridis has been investigated by ESR, ENDOR and TRIPLE techniques. Both the comparison with the cation radical of monomeric bacteriochlorophyll b (BChl b) and with molecular-orbital calculations performed on P& using the results of an X-ray structure analysis, consistently show an asymmetric distribution of the unpaired electron over the two BChl b molecules which constitute P&b. The possible relevance of this result for the primary electron transfer step in the reaction center is briefly discussed.

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“…The activation energy is the same as the enthalpy change. The reaction is more favourable if mediated with hydrogen or hydroxyl radicals [36].…”

Section: The Formation Of ε ζ and η-Tocopherolmentioning

confidence: 99%

A Computational Study of a Prebiotic Synthesis of α-Tocopherol, Vitamin-E and Tocols

Aylward

2023

Molecular Sciences and Applications

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The prebiotic synthesis of α-tocopherol and the tocols is postulated as a copolymerization of the planetary gases propyne, ethyne and carbon monoxide on a magnesium ion metalloporphyrin complex where the ligands are bonded on the metal or nitrogen pyrrole sites as a two site catalyst. The order of addition of the monomers to form the chroman residue of α-tocopherol is 2 ethyne, propyne, carbon monoxide, 2 ethyne, carbon monoxide leading to bonding on the catalyst to give a chroman derivative. The phytyl side-chain is formed from the successive addition of propyne and ethyne monomers where the isoprenoid residues formed are subsequently hydrogenated. The separation of the catalyst is facilitated by hydrogen radicals to give α-tocopherol. The reactions have been shown to be feasible from the overall enthalpy changes in the ZKE approximation at the HF and MP2 /6-31G* level, and with acceptable activation energies.

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Light Path of Carbon Reduction in Photosynthesis

Cited by 5 publications

References 128 publications

Magnetic Resonance and Molecular Orbital Studies of the Primary Donor Cation Radical P^+.₉₆₀ in the Photosynthetic Bacterium Rhodopseudomonas viridis

Magnetic Resonance and Molecular Orbital Studies of the Primary Donor Cation Radical P^+.₉₆₀ in the Photosynthetic Bacterium Rhodopseudomonas viridis

ESR, ENDOR and TRIPLE resonance studies of the primary donor radical cation P960+• in the photosynthetic bacterium Rhodopseudomonas viridis

A Computational Study of a Prebiotic Synthesis of α-Tocopherol, Vitamin-E and Tocols

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Light Path of Carbon Reduction in Photosynthesis

Cited by 5 publications

References 128 publications

Magnetic Resonance and Molecular Orbital Studies of the Primary Donor Cation Radical P+.960 in the Photosynthetic Bacterium Rhodopseudomonas viridis

Magnetic Resonance and Molecular Orbital Studies of the Primary Donor Cation Radical P+.960 in the Photosynthetic Bacterium Rhodopseudomonas viridis

ESR, ENDOR and TRIPLE resonance studies of the primary donor radical cation P960+• in the photosynthetic bacterium Rhodopseudomonas viridis

A Computational Study of a Prebiotic Synthesis of α-Tocopherol, Vitamin-E and Tocols

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Magnetic Resonance and Molecular Orbital Studies of the Primary Donor Cation Radical P^+.₉₆₀ in the Photosynthetic Bacterium Rhodopseudomonas viridis

Magnetic Resonance and Molecular Orbital Studies of the Primary Donor Cation Radical P^+.₉₆₀ in the Photosynthetic Bacterium Rhodopseudomonas viridis