The DOI matches its Crossref record; 11 of the 11 references it cites were found in a registry or an index.
55Mn ENDOR of the S2-State Multiline EPR Signal of Photosystem II: Implications on the Structure of the Tetranuclear Mn Cluster
Abstract
We have performed continuous-wave electron paramagnetic resonance (CW-EPR) and electron spin echo electron nuclear double resonance (ESE-ENDOR) experiments on the multiline form of the S 2 -state of untreated, MeOH-treated, and ammonia-treated spinach photosystem II (PS II) centers. Through simultaneously constrained simulations of the CW-EPR and ESE-ENDOR data, we conclude that four effective 55 Mn hyperfine tensors ( A X, A Y, A Z ) are required to properly simulate the experimental data [untreated and MeOH-treated PS II centers (MHz): −232, −232, −270; 200, 200, 250; −311, −311, −270; 180, 180, 240; ammonia-treated PS II centers (MHz): 208, 208, 158; −150, −150, −112; 222, 222, 172; −295, −315, −390]. We further show that these effective hyperfine tensors are best supported by a trimer/monomer arrangement of three Mn(IV) ions and one Mn(III) ion. In this topology, Mn A, Mn B, and Mn C form a strongly exchange coupled core ( J AB and J BC < −100 cm -1 ) while Mn D is weakly exchange coupled ( J CD ) to one end of the trinuclear core. For untreated and MeOH-treated PS II centers, the Mn(III) ion is either Mn A or Mn C, with a zero-field-splitting of D = −1.25 to −2.25 cm - 1 . For ammonia-treated PS II centers, the Mn(III) ion is Mn D, with a zero-field-splitting of D = +0.75 to +1.75 cm - 1 . The binding of the ammonia ligand results in a shift of the Mn(III) ion from the trinuclear core to the monomer Mn ion. This structural model can also account for the higher spin of the g = 4.1 signal and the magnetic properties of the S 0 -state.
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Cites
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Proton-coupled electron transfer
Huynh, M. H. V., & Meyer, T. J. (2007) · Chemical Reviews · doi:10.1021/cr0500030 · Cited by 1,659
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Lubitz, W., Reijerse, E. J., & Messinger, J. (2008) · Energy & Environmental Science · doi:10.1039/b808792j · Cited by 408
Functional models for the oxygen-evolving complex of photosystem II
Cady, C. W., Crabtree, R. H., & Brudvig, G. W. (2008) · Coordination Chemistry Reviews · doi:10.1016/j.ccr.2007.06.002 · Cited by 403
Ames, W., Pantazis, D. A., Krewald, V., Cox, N., Messinger, J., Lubitz, W., & Neese, F. (2011) · Journal of the American Chemical Society · doi:10.1021/ja2041805 · Cited by 289
Chang, C. J., Chang, M. C. Y., Damrauer, N. H., & Nocera, D. G. (2004) · Biochimica et Biophysica Acta (BBA) - Bioenergetics · doi:10.1016/j.bbabio.2003.08.010 · Cited by 189
Metadata
- Authors
- Peloquin, J. M., Campbell, K. A., Randall, D. W., Evanchik, M. A., Pecoraro, V. L., Armstrong, W. H., & Britt, R. D.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2000-10-21
- Volume
- 122
- Issue
- 44
- Pages
- 10926-10942
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W1995414833
- Cited by
- 377
- References
- 11
- FWCI
- 4.96
- Type
- journal article
- Language
- en
- Open access
- closed
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