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Medientyp:
E-Artikel
Titel:
Mössbauer studies of the non‐heme iron and cytochrome b559 in a Chlamydomonas reinhardtii PSI− mutant and their interactions with α‐tocopherol quinone
Beteiligte:
Burda, Květoslava;
Kruk, Jerzy;
Borgstädt, Rüdiger;
Stanek, Jan;
Strza ka, Kazimierz;
Schmid, Georg H.;
Kruse, Olaf
Erschienen:
Wiley, 2003
Erschienen in:FEBS Letters
Sprache:
Englisch
DOI:
10.1016/s0014-5793(02)03895-4
ISSN:
0014-5793;
1873-3468
Entstehung:
Anmerkungen:
Beschreibung:
<jats:p>Spin and valence states of the non‐heme iron and the heme iron of cytochrome <jats:italic>b</jats:italic>
<jats:sub>559</jats:sub>, as well as their interactions with α‐tocopherol quinone (α‐TQ) in photosystem II (PSII) thylakoid membranes prepared from the <jats:italic>Chlamydomonas reinhardtii</jats:italic> PSI<jats:sup>−</jats:sup> mutant have been studied using Mössbauer spectroscopy. Both of the iron atoms are in low spin ferrous states. The Debye temperature of the non‐heme is 194 K and of the heme iron is 182 K. The treatment of α‐TQ does not change the spin and the valence states of the non‐heme iron but enhances the covalence of its bonds. α‐TQ oxidizes the heme iron into the high spin Fe<jats:sup>3+</jats:sup> state. A possible role of the non‐heme iron and α‐TQ in electron flow through the PSII is discussed.</jats:p>