Photosystem II of green plants: topology of core pigments and redox cofactors as inferred from electrochromic difference spectra

Biochemistry
A Y MulkidjanianW Junge

Abstract

Three electrochromic difference spectra induced by the deposition of (1) a negative charge on the primary quinone acceptor, Q(A), (2) a positive charge on (or near) Tyr161 of the D1 subunit (Y(Z)), and (3) a positive charge on the manganese cluster were determined at room temperature in photosystem II (PSII) core particles from pea. They were deconvoluted into Gaussian components by Powell's numerical optimization procedure. All three spectra were fitted by four components, which we assigned to the Q(y) absorption bands of two chlorophyll a molecules of the primary donor P, the accessory chlorophyll a, and the pheophytin a molecules on the D1 subunit. On the basis of the electrochromic properties of chlorins and our data, we suggest an arrangement of pigments and redox cofactors in PSII that differs from current structural models, which have been shaped like the reaction centers (RC) of purple bacteria. Our model is compatible with sequence data, with the spectroscopic and electrochemical properties of chlorophyll a and pheophytin a, and with the extremely positive redox potential of water oxidation. We conclude the following: (1) P is formed from two orthogonally oriented chlorophyll a molecules that peak at 681 and 677 nm. (2...Continue Reading

References

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Citations

May 12, 2007·Photosynthesis Research·Jan KernAthina Zouni
Jul 11, 2013·Photosynthesis Research·Elmars Krausz
May 27, 1999·Journal of Photochemistry and Photobiology. B, Biology·S TalI Ohad
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Nov 20, 2002·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Wolfgang JungeJürgen Clausen
Jul 25, 2006·Biophysical Journal·Julia Adolphs, Thomas Renger
Dec 15, 2000·Biochimica Et Biophysica Acta·F Rappaport, J Lavergne
Apr 27, 1999·Biochimica Et Biophysica Acta·M Haumann, W Junge
Jun 20, 2006·Biochimica Et Biophysica Acta·Armen Y Mulkidjanian
Apr 27, 1999·Biochimica Et Biophysica Acta·M Haumann, W Junge
Aug 26, 2011·Biochimica Et Biophysica Acta·Katherine E Shinopoulos, Gary W Brudvig
Sep 3, 1996·Biochemistry·Y Deligiannakis, A W Rutherford
Feb 18, 2020·Biochimica Et Biophysica Acta. Bioenergetics·Alain BoussacMiwa Sugiura
Jul 21, 2006·The Journal of Physical Chemistry. B·Nikolaj Ivashin, Sven Larsson

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