PMID: 2110474Apr 3, 1990Paper

Fourier transform infrared difference spectroscopy shows no evidence for an enolization of chlorophyll a upon cation formation either in vitro or during P700 photooxidation

Biochemistry
E NabedrykJ Breton

Abstract

Molecular changes associated with the photooxidation of the primary electron donor P700 in photosystem I from cyanobacteria have been investigated with Fourier transform infrared (FTIR) difference spectroscopy. Highly resolved signals are observed in the carbonyl stretching frequency region of the light-induced FTIR spectra. In order to assign and to interpret these signals, the FTIR spectra of isolated chlorophyll a and pyrochlorophyll a (lacking the 10a-ester carbonyl) in both their neutral and cation states were investigated. Comparison of the redox-induced FTIR difference spectra of these two model compounds demonstrates that upon chlorophyll a cation formation in tetrahydrofuran the 7c-ester carbonyl is essentially unperturbed while the 10a-ester carbonyl is upshifted from 1738 to 1751 cm-1. For the 9-keto group, the shift is from 1693 to 1718 cm-1 in chlorophyll a and from 1686 to 1712 cm-1 in pyrochlorophyll a. The 1718-cm-1 band in the difference spectrum of chlorophyll a is thus unambiguously assigned to the 9-keto carbonyl of the cation. Comparison of the light-induced FTIR difference spectrum associated with the photooxidation of P700 in vivo with the difference FTIR spectrum of chlorophyll a cation formation leads t...Continue Reading

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Citations

Jun 11, 2009·Photosynthesis Research·Catherine Berthomieu, Rainer Hienerwadel
Aug 1, 1993·Trends in Microbiology·M Mock, A Ullmann
Oct 29, 2003·Biophysical Journal·Velautham SivakumarGary Hastings
Jul 10, 2012·Physical Chemistry Chemical Physics : PCCP·Vincenzo BaroneFilippo Lipparini
Oct 15, 1992·Proceedings of the National Academy of Sciences of the United States of America·U FinkeleW Zinth
Dec 1, 1993·Proceedings of the National Academy of Sciences of the United States of America·G M MacDonaldB A Barry
Sep 2, 2005·Proceedings of the National Academy of Sciences of the United States of America·Marie Louise GrootRienk van Grondelle
Feb 14, 1994·FEBS Letters·S I AllakhverdievR Carpentier
Jun 29, 2014·Biochimica Et Biophysica Acta·Mariangela Di Donato, Marie Louise Groot
Jul 22, 2008·Biophysical Journal·Shana L Bender, Bridgette A Barry
Aug 19, 2007·Biochimica Et Biophysica Acta·Andreas Barth
Dec 31, 2010·Biophysical Journal·Miriam Colindres-RojasRolf Diller
Oct 13, 1992·Biochemistry·G M MacDonald, B A Barry
Apr 17, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Noura Zamzam, Jasper J van Thor
Oct 10, 2008·The Journal of Physical Chemistry. B·Sreeja ParameswaranGary Hastings
May 26, 2005·Journal of the American Chemical Society·Colette A SackstederBridgette A Barry

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