Výsledky vyhledávání

Sulfur K-edge x-ray absorption spectroscopy: A spectroscopic tool to examine the redox state of S-containing metabolites in vivo

Autor: Ann E. McDermott, Kenneth Sauer, Annette Rompel, Melvin P. Klein, Roehl M. Cinco, Ronald M. Krauss, Vittal K. Yachandra, Matthew J. Latimer, Alexandre Quintanilha, R.D. Guiles

Publikováno v: Proceedings of the National Academy of Sciences. 95:6122-6127

The sulfur K-edge x-ray absorption spectra for the amino acids cysteine and methionine and their corresponding oxidized forms cystine and methionine sulfoxide are presented. Distinct differences in the shape of the edge and the inflection point energ

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9151585249d5191a87207002ec1bf160
https://doi.org/10.1073/pnas.95.11.6122

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The S0 state of photosystem II induced by hydroxylamine: differences between the structure of the manganese complex in the S0 and S1 states determined by x-ray absorption spectroscopy

Autor: R. D. Britt, Ann E. McDermott, R.D. Guiles, S. L. Dexheimer, James L. Cole, Vittal K. Yachandra, Kenneth Sauer, Melvin P. Klein

Publikováno v: Biochemistry. 29:486-496

Hydroxylamine at low concentrations causes a two-flash delay in the first maximum flash yield of oxygen evolved from spinach photosystem II (PSII) subchloroplast membranes that have been excited by a series of saturating flashes of light. Untreated P

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::eb088c91797403f7b74e83012bc0417a
https://doi.org/10.1021/bi00454a024

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The S3 state of photosystem II: differences between the structure of the manganese complex in the S2 and S3 states determined by x-ray absorption spectroscopy

Autor: Ann E. McDermott, J.-L. Zimmermann, R. D. Britt, S. L. Dexheimer, K. Sauer, James L. Cole, R.D. Guiles, Vittal K. Yachandra, Bossek U, Karl Wieghardt

Publikováno v: Biochemistry. 29:471-485

O2-evolving photosystem II (PSII) membranes from spinach have been cryogenically stabilized in the S3 state of the oxygen-evolving complex. The cryogenic trapping of the S3 state was achieved using a double-turnover illumination of dark-adapted PSII

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2fe14b44f03a51c70b5fd45392d4d4f0
https://doi.org/10.1021/bi00454a023

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Structures and Oxidation States of MN in Several S-States of Photosystem II Determined by X-Ray Absorption Spectroscopy

Autor: Kenneth Sauer, Ann E. McDermott, R.D. Guiles, Victoria J. DeRose, Vittal K. Yachandra, J.-L. Zimmermann, Melvin P. Klein

Publikováno v: Current Research in Photosynthesis ISBN: 9789401067164

X-ray spectroscopy employing synchrotron radiation has been applied to the study of the Mn clusters associated with the oxygen evolving complex (OEC) of Photosystem II. We have shown earlier that the edge energies can be used to indicate oxidation st

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f9ca74bf7f255ea43b70403d9989487a
https://doi.org/10.1007/978-94-009-0511-5_181

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The state of manganese in the photosynthetic apparatus

Autor: Melvin P. Klein, Kenneth Sauer, Ann E. McDermott, R. David Britt, S. L. Dexheimer, R.D. Guiles, Vittal K. Yachandra

Publikováno v: Biochimica et Biophysica Acta (BBA) - Bioenergetics. 850:324-332

The structure of the Mn complex in the oxygen-evolving system and its mechanistic relation to photosynthetic oxygen evolution are poorly understood, though many studies have established that membrane-bound Mn plays an active role. Recently establishe

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4cf0d1523337c0a70f82d0a80632949e
https://doi.org/10.1016/0005-2728(86)90188-x

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Assignment of the g = 4.1 ERP signal to manganese in the S2 state of the photosynthetic oxygen-evolving complex: An X-ray absorption edge spectroscopy study

Autor: Vittal K. Yachandra, Melvin P. Klein, S. L. Dexheimer, Ann E. McDermott, James L. Cole, R.D. Guiles, R. D. Britt, Kenneth Sauer

Publikováno v: Biochimica et Biophysica Acta (BBA) - Bioenergetics. 890:395-398

X-ray absorption spectroscopy at the Mn K-edge has been utilized to study the origin of the g = 4.1 EPR signal associated with the Mn-containing photosynthetic O2-evolving complex. Formation of the g = 4.1 signal by illumination of Photosystem II pre

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::15940293affa35a2857ccf4903218db5
https://doi.org/10.1016/0005-2728(87)90169-1

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Characterization of the manganese oxygen-evolving complex and the iron-quinone acceptor complex in photosystem II from a thermophilic cyanobacterium by electron paramagnetic resonance and x-ray absorption spectroscopy

Autor: R. D. Britt, R.D. Guiles, Melvin P. Klein, Kenneth Sauer, S. L. Dexheimer, Vittal K. Yachandra, James L. Cole, Ann E. McDermott

Publikováno v: Biochemistry. 27:4021-4031

The Mn donor complex in the S1 and S2 states and the iron-quinone acceptor complex (Fe2+-Q) in O2-evolving photosystem II (PS II) preparations from a thermophilic cyanobacterium, Synechococcus sp., have been studied with X-ray absorption spectroscopy

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fe2cc1135866a667cc99ea9b57f4b8be
https://doi.org/10.1021/bi00411a019

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Comparison of the structure of the manganese complex in the S1 and S2 states of the photosynthetic oxygen-evolving complex: an x-ray absorption spectroscopy study

Autor: R.D. Guiles, R. D. Britt, Melvin P. Klein, Vittal K. Yachandra, Ann E. McDermott, K. Sauer, James L. Cole, S. L. Dexheimer

Publikováno v: Biochemistry. 26:5974-5981

A Mn-containing enzyme complex is involved in the oxidation of H/sub 2/O to O/sub 2/ in algae and higher plants. X-ray absorption spectroscopy is well suited for studying the structure and function of Mn in this enzyme complex. Results of X-ray K-edg

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0db8396f2a0c60659ed018397780ccfd
https://doi.org/10.1021/bi00393a005

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EXAFS structural study of FX, the low-potential iron-sulfur center in photosystem I

Autor: Ann E. McDermott, John H. Golbeck, Kevin G. Parrett, Melvin P. Klein, R.D. Guiles, Vittal K. Yachandra, Kenneth Sauer

Publikováno v: Biochemistry. 28:8056-8059

We present iron extended X-ray absorption fine structure (EXAFS) spectra of a photosystem I core preparation containing FX, the very low potential iron-sulfur cluster in photosystem I. The preparation lacks FA and FB. The amplitude of Fe-Fe backscatt

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7a7f7364a1fe68574987df4107c9ac45
https://doi.org/10.1021/bi00446a013

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