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Xiong L, Seibert M, Gusev AV, Wasielewski MR, Hemann C, Hille CR, Sayre RT. Substitution of a Chlorophyll into the Inactive Branch Pheophytin-Binding Site Impairs Charge Separation in Photosystem II. J Phys Chem B 2004. [DOI: 10.1021/jp040262d] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ling Xiong
- Departments of Plant Cellular and Molecular Biology and Molecular and Cellular Biochemistry, Ohio State University, Columbus, Ohio 43210, National Renewable Energy Laboratory, Golden, Colorado 80401, and Department of Chemistry, Northwestern University, Evanston, Illinois 60208
| | - Michael Seibert
- Departments of Plant Cellular and Molecular Biology and Molecular and Cellular Biochemistry, Ohio State University, Columbus, Ohio 43210, National Renewable Energy Laboratory, Golden, Colorado 80401, and Department of Chemistry, Northwestern University, Evanston, Illinois 60208
| | - Alexey V. Gusev
- Departments of Plant Cellular and Molecular Biology and Molecular and Cellular Biochemistry, Ohio State University, Columbus, Ohio 43210, National Renewable Energy Laboratory, Golden, Colorado 80401, and Department of Chemistry, Northwestern University, Evanston, Illinois 60208
| | - Michael R. Wasielewski
- Departments of Plant Cellular and Molecular Biology and Molecular and Cellular Biochemistry, Ohio State University, Columbus, Ohio 43210, National Renewable Energy Laboratory, Golden, Colorado 80401, and Department of Chemistry, Northwestern University, Evanston, Illinois 60208
| | - Craig Hemann
- Departments of Plant Cellular and Molecular Biology and Molecular and Cellular Biochemistry, Ohio State University, Columbus, Ohio 43210, National Renewable Energy Laboratory, Golden, Colorado 80401, and Department of Chemistry, Northwestern University, Evanston, Illinois 60208
| | - C. Russ Hille
- Departments of Plant Cellular and Molecular Biology and Molecular and Cellular Biochemistry, Ohio State University, Columbus, Ohio 43210, National Renewable Energy Laboratory, Golden, Colorado 80401, and Department of Chemistry, Northwestern University, Evanston, Illinois 60208
| | - Richard T. Sayre
- Departments of Plant Cellular and Molecular Biology and Molecular and Cellular Biochemistry, Ohio State University, Columbus, Ohio 43210, National Renewable Energy Laboratory, Golden, Colorado 80401, and Department of Chemistry, Northwestern University, Evanston, Illinois 60208
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Barto RR, Frank CW, Bedworth PV, Ermer S, Taylor RE. Near-Infrared Optical Absorption Behavior in High-β Nonlinear Optical Chromophore−Polymer Guest−Host Materials. 1. Continuum Dielectric Effects in Polycarbonate Hosts. J Phys Chem B 2004. [DOI: 10.1021/jp037239x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Wang J, Gosztola D, Ruffle SV, Hemann C, Seibert M, Wasielewski MR, Hille R, Gustafson TL, Sayre RT. Functional asymmetry of photosystem II D1 and D2 peripheral chlorophyll mutants of Chlamydomonas reinhardtii. Proc Natl Acad Sci U S A 2002; 99:4091-6. [PMID: 11904453 PMCID: PMC122653 DOI: 10.1073/pnas.062056899] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2001] [Accepted: 01/31/2002] [Indexed: 11/18/2022] Open
Abstract
The peripheral accessory chlorophylls (Chls) of the photosystem II (PSII) reaction center (RC) are coordinated by a pair of symmetry-related histidine residues (D1-H118 and D2-H117). These Chls participate in energy transfer from the proximal antennae complexes (CP43 and CP47) to the RC core chromophores. In addition, one or both of the peripheral Chls are redox-active and participate in a low-quantum-yield electron transfer cycle around PSII. We demonstrate that conservative mutations of the D2-H117 residue result in decreased Chl fluorescence quenching efficiency attributed to reduced accumulation of the peripheral accessory Chl cation, Chl(Z)(+). In contrast, identical symmetry-related mutations at residue D1-H118 had no effect on Chl fluorescence yield or quenching kinetics. Mutagenesis of the D2-H117 residue also altered the line width of the Chl(Z)(+) EPR signal, but the line shape of the D1-H118Q mutant remained unchanged. The D1-H118 and D2-H117 mutations also altered energy transfer properties in PSII RCs. Unlike wild type or the D1-H118Q mutant, D2-H117N RCs exhibited a reduced CD doublet in the red region of Chl absorbance band, indicative of reduced energetic coupling between P680 and the peripheral accessory Chl. In addition, transient absorption measurements of D2-H117N RCs, excited on the blue side of the Chl absorbance band, exhibited a ( approximately 400 fs) pheophytin Q(X) band bleach lifetime component not seen in wild-type or D1-H118Q RCs. The origin of this component may be related to delayed fast-energy equilibration of the excited state between the core pigments of this mutant.
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Affiliation(s)
- Jun Wang
- Department of Plant Biology, Ohio State University, Columbus, OH 43210, USA
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