The S-1 split signal of photosystem II: a tyrosine-manganese coupled interaction

The S-1 split signal of photosystem II : a tyrosine-manganese coupled interaction

Cox, Nicholas (author)

Ho, Felix M. (author): Uppsala universitet,Institutionen för fotokemi och molekylärvetenskap

Pewnim, Naray (author)

Steffen, Ronald (author)

Smith, Paul J. (author)

Havelius, Kajsa G. V. (author): Uppsala universitet,Institutionen för fotokemi och molekylärvetenskap

Hughes, Joseph L. (author)

Debono, Lesley (author)

Krausz, Elmars (author)

Pace, Ron J. (author)

(creator_code:org_t)

Elsevier BV, 2009
2009
English.
In: Biochimica et Biophysica Acta - Bioenergetics. - : Elsevier BV. - 0005-2728 .- 1879-2650. ; 1787:7, s. 882-889

Related links:: https://doi.org/10.1...; show more...; https://urn.kb.se/re...; https://doi.org/10.1...; show less...

Abstract Subject headings

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).

By the author/editor: Cox, Nicholas; Ho, Felix M.; Pewnim, Naray; Steffen, Ronald; Smith, Paul J.; Havelius, Kajsa ...; show more...; Hughes, Joseph L ...; Debono, Lesley; Styring, Stenbjö ...; Krausz, Elmars; Pace, Ron J.; show less...

About the subject

MEDICAL AND HEALTH SCIENCES: MEDICAL AND HEAL ...; and Basic Medicine; and Other Basic Medi ...

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