The DOI matches its Crossref record; 6 of the 6 references it cites were found in a registry or an index.
Proton-Coupled Electron Transfer from Tyrosine in a Tyrosine−Ruthenium−tris-Bipyridine Complex: Comparison with TyrosineZ Oxidation in Photosystem II
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 p K a ≈ 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 > p K a, resulted in a 100-fold increase in rate constant due to a decreased reorganization energy, λ = 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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Electron transfers in chemistry and biology
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Photoinduced electron transfer mediated by a hydrogen-bonded interface
Turro, C., Chang, C. K., Leroi, G. E., Cukier, R. I., & Nocera, D. G. (1992) · Journal of the American Chemical Society · doi:10.1021/ja00036a081 · Cited by 247
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Self-citationDiner, B. A., Force, D. A., Randall, D. W., & Britt, R. D. (1998) · Biochemistry · doi:10.1021/bi981894r · Cited by 123
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Cited by
Proton-coupled electron transfer
Huynh, M. H. V., & Meyer, T. J. (2007) · Chemical Reviews · doi:10.1021/cr0500030 · Cited by 1,659
Molecular Catalysis of Electrochemical Reactions. Mechanistic Aspects
Savéant, J.-M. (2008) · Chemical Reviews · doi:10.1021/cr068079z · Cited by 978
Quantum Algorithms for Quantum Chemistry and Quantum Materials Science
Bauer, B., Bravyi, S., Motta, M., & Chan, G. K.-L. (2020) · Chemical Reviews · doi:10.1021/acs.chemrev.9b00829 · Cited by 848
Theory of Coupled Electron and Proton Transfer Reactions
Hammes-Schiffer, S., & Stuchebrukhov, A. A. (2010) · Chemical Reviews · doi:10.1021/cr1001436 · Cited by 848
Photochemistry and Photophysics of Coordination Compounds: Ruthenium
Campagna, S., Puntoriero, F., Nastasi, F., Bergamini, G., & Balzani, V. (2007) · Topics in Current Chemistry · doi:10.1007/128_2007_133 · Cited by 842
Metadata
- Authors
- Sjödin, M., Styring, S., Åkermark, B., Sun, L., & Hammarström, L.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2000-04-01
- Volume
- 122
- Issue
- 16
- Pages
- 3932-3936
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W1995067163
- Cited by
- 265
- References
- 6
- FWCI
- 5.35
- Type
- journal article
- Language
- en
- Open access
- closed
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- Sjödin, M., Styring, S., Åkermark, B., Sun, L., & Hammarström, L. (2000). Proton-Coupled Electron Transfer from Tyrosine in a Tyrosine−Ruthenium−tris-Bipyridine Complex: Comparison with TyrosineZ Oxidation in Photosystem II. Journal of the American Chemical Society. https://doi.org/10.1021/ja993044k
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