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The S-1 split signal of photosystem II: a tyrosine-manganese coupled interaction
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Photochemistry and Molecular Science.
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2009 (English)In: Biochimica et Biophysica Acta - Bioenergetics, ISSN 0005-2728, E-ISSN 1879-2650, Vol. 1787, no 7, 882-889 p.Article in journal (Refereed) Published
Abstract [en]

Detailed optical and EPR analyses of states induced in dark-adapted PS II membranes by cryogenic illumination permit characterization and quantification of all pigment derived donors and acceptors, as well as optically silent (in the visible, near infrared) species which are EPR active. Near complete turnover formation of Q(A)(-) is seen in all centers, but with variable efficiency, depending on the donor species. In minimally detergent-exposed PS II membranes, negligible (<5%) oxidation of chlorophyll or carotenoid centers occurs for illumination temperatures 5-20 K. An optically silent electron donor to P680(+) is observed with the same decay kinetics as the S-1 split signal. Cryogenic donors to P680(+) seen are: (i) transient (t(1/2)similar to 150 s) tyrosine related species, including 'split signals' (similar to 15% total centers), (ii) reduced cytochrome b(559) (similar to 30-50% centers), and (iii) an organic donor, possibly an amino acid side chain, (similar to 30% centers).

Place, publisher, year, edition, pages
2009. Vol. 1787, no 7, 882-889 p.
Keyword [en]
S-1 split signal, Carotenoid, Chlorophyll, Cytochrome b(559), Pheophytin, Tyrosine, Exchange coupled interaction
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Other Basic Medicine
Identifiers
URN: urn:nbn:se:uu:diva-148803DOI: 10.1016/j.bbabio.2009.03.023ISI: 000267772000015OAI: oai:DiVA.org:uu-148803DiVA: diva2:403371
Available from: 2011-03-12 Created: 2011-03-10 Last updated: 2016-04-22Bibliographically approved

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Ho, Felix M.Styring, Stenbjörn

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