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Träfflista för sökning "WFRF:(Akermark B) ;pers:(Sjodin M.)"

Sökning: WFRF:(Akermark B) > Sjodin M.

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1.
  • Sjodin, M., et al. (författare)
  • Proton-coupled electron transfer from tyrosine in a tyrosine-ruthenium-tris-bipyridine complex : Comparison with Tyrosine(z) oxidation in photosystem II
  • 2000
  • Ingår i: Journal of the American Chemical Society. - : American Chemical Society (ACS). - 0002-7863 .- 1520-5126. ; 122:16, s. 3932-3936
  • Tidskriftsartikel (refereegranskat)abstract
    • The pH- and the temperature dependence of the rate constant for electron transfer from tyrosine to ruthenium in Ru(II)(bpy)(2)(4-Me-4'CONH-L-tyrosine etyl ester-2,2'-bpy) 2PF(6) was investigated using flash photolysis. At a pH below the tyrosine pK(a) approximate to 10 the rate constant increased monotonically with pH. This increase was consistent with a concerted electron transfer/deprotonation mechanism. Also indicative of a concerted reaction was the unusually high reorganization energy, 2 eV, extracted from temperature-dependent measurements. Deprotonation of the tyrosine group, at pH > pK(a), resulted in a 100-fold increase in rate constant due to a decreased reorganization energy, lambda = 0.9 eV. Also, the rate constant became independent of pH, In Mn-depleted photosystem II a similar pH dependence has been found for electron transfer from tyrosine(Z) (Tyr(Z)) to the oxidized primary donor P680(+). On the basis of the kinetic similarities we propose that the mechanisms in the two systems are the same, that is, the electron transfer occurs as a concerted proton-coupled electron-transfer reaction, and at pH < 7 the Tyr(Z) proton is released directly to the bulk water.
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3.
  • Sjodin, M., et al. (författare)
  • The mechanism for proton-coupled electron transfer from tyrosine in a model complex and comparisons with Y-z oxidation in photosystem II
  • 2002
  • Ingår i: Philosophical Transactions of the Royal Society of London. Biological Sciences. - : The Royal Society. - 0962-8436 .- 1471-2970. ; 357:1426, s. 1471-1478
  • Tidskriftsartikel (refereegranskat)abstract
    • In the water-oxidizing reactions of photosystem II (PSII), a tyrosine residue plays a key part as an intermediate electron-transfer reactant between the primary donor chlorophylls (the pigment P-680) and the water-oxidizing Mn cluster. The tyrosine is deprotonated upon oxidation, and the coupling between the proton reaction and electron transfer is of great mechanistic importance for the understanding of the water-oxidation mechanism. Within a programme on artificial photosynthesis, we have made and studied the proton-coupled tyrosine oxidation in a model system and been able to draw mechanistic conclusions that we use to interpret the analogous reactions in PSII.
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  • Resultat 1-3 av 3
Typ av publikation
tidskriftsartikel (3)
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refereegranskat (3)
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Akermark, B. (3)
Sjodin, M. (3)Ta bort avgränsningen
Hammarstrom, L (2)
Sun, Licheng C. (2)
Styring, Stenbjörn (2)
Styring, S. (1)
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Sun, LC (1)
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Kungliga Tekniska Högskolan (2)
Lunds universitet (2)
Uppsala universitet (1)
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Engelska (3)
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Naturvetenskap (2)

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