Mossbauer studies of Cu(II) ions interaction with the non-heme iron and cytochrome b(559) in a Chlamydomonas reinhardtii PSI minus mutant

Burda K, Kruk J, Strzalka K, Stanek J, Schmid GH, Kruse O (2006)
In: ACTA PHYSICA POLONICA A. 109. POLISH ACAD SCIENCES INST PHYSICS: 237-247.

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Abstract
Mossbauer spectroscopy was applied, for the first time, to study the interaction of copper ions with the non-heme iron and the heme iron of cytochrome b(559) in photosystem II thylakoids isolated from a Chlamydomonas reinhardtii photosystem I minus mutant. We showed that copper ions oxidize the heme iron and change its low spin state into a high spin state. This is probably due to deprotonation of the histidine coordinating the heme. We also found that copper preserves the non-heme iron in a low spin ferrous state, enhancing the covalence of iron bonds as compared to the untreated sample. We Suggest that a, disruption of hydrogen bonds stabilizing the quinone-iron complex by Cu2+ is the mechanism responsible for a new arrangement of the binding site of the non-heme iron leading to its more "tense" structure. Such a diamagnetic state of the non-heme iron induced by copper results in a magnetic decoupling of iron from the primary quinone acceptor. These results indicate that Cu does not cause removal of the non-heme iron from its binding site. The observed Cu2+ action on the non-heme iron and cytochrome b559 is similar to that previously observed for alpha-tocopherol quinone.
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Burda K, Kruk J, Strzalka K, Stanek J, Schmid GH, Kruse O. Mossbauer studies of Cu(II) ions interaction with the non-heme iron and cytochrome b(559) in a Chlamydomonas reinhardtii PSI minus mutant. In: ACTA PHYSICA POLONICA A. Vol 109. POLISH ACAD SCIENCES INST PHYSICS; 2006: 237-247.
Burda, K., Kruk, J., Strzalka, K., Stanek, J., Schmid, G. H., & Kruse, O. (2006). Mossbauer studies of Cu(II) ions interaction with the non-heme iron and cytochrome b(559) in a Chlamydomonas reinhardtii PSI minus mutant. ACTA PHYSICA POLONICA A, 109(3), 237-247.
Burda, K., Kruk, J., Strzalka, K., Stanek, J., Schmid, G. H., and Kruse, O. (2006). “Mossbauer studies of Cu(II) ions interaction with the non-heme iron and cytochrome b(559) in a Chlamydomonas reinhardtii PSI minus mutant” in ACTA PHYSICA POLONICA A, vol. 109, (POLISH ACAD SCIENCES INST PHYSICS), 237-247.
Burda, K., et al., 2006. Mossbauer studies of Cu(II) ions interaction with the non-heme iron and cytochrome b(559) in a Chlamydomonas reinhardtii PSI minus mutant. In ACTA PHYSICA POLONICA A. no.109 POLISH ACAD SCIENCES INST PHYSICS, pp. 237-247.
K. Burda, et al., “Mossbauer studies of Cu(II) ions interaction with the non-heme iron and cytochrome b(559) in a Chlamydomonas reinhardtii PSI minus mutant”, ACTA PHYSICA POLONICA A, vol. 109, POLISH ACAD SCIENCES INST PHYSICS, 2006, pp.237-247.
Burda, K., Kruk, J., Strzalka, K., Stanek, J., Schmid, G.H., Kruse, O.: Mossbauer studies of Cu(II) ions interaction with the non-heme iron and cytochrome b(559) in a Chlamydomonas reinhardtii PSI minus mutant. ACTA PHYSICA POLONICA A. 109, p. 237-247. POLISH ACAD SCIENCES INST PHYSICS (2006).
Burda, K, Kruk, J, Strzalka, K, Stanek, J, Schmid, GH, and Kruse, Olaf. “Mossbauer studies of Cu(II) ions interaction with the non-heme iron and cytochrome b(559) in a Chlamydomonas reinhardtii PSI minus mutant”. ACTA PHYSICA POLONICA A. POLISH ACAD SCIENCES INST PHYSICS, 2006.Vol. 109. 237-247.
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