Structural and functional modifications of the major light-harvesting complex II in cadmium- or copper-treated Secale cereale

Plant & Cell Physiology
Ewa JanikWieslaw I Gruszecki

Abstract

The effects of 50 microM cadmium (Cd) or copper (Cu) ions on the supramolecular conformation of the light-harvesting pigment-protein complex of PSII (LHCII) isolated from rye seedlings were studied. It was found that the action of these two metal ions on the LHCII structure and organization is dissimilar. The Fourier transform infrared (FTIR) measurements indicated inhibition or stimulation of formation of parallel beta-structures and aggregates in the presence of Cd or Cu ions, respectively. The Chl a fluorescence excitation spectra of LHCII extracted from Cd-treated plants showed that the decreased aggregation of complexes was correlated with a decline in efficiency of quenching of excitation energy. From the results of mass spectrometry, changes in LHCII aggregation in the presence of Cd ions might be based on decreases in the molecular mass of Lhcb1 and Lhcb2 proteins. An increase in the content of LHCII aggregates under Cu ion excess was associated with changes in the LHCII xanthophyll pigment pool. In the complexes isolated from Cu-treated plants, all-trans violaxanthin and 9'-cis neoxanthin content declined and the simultaneous appearance of the fraction of 9-cis violaxanthin was observed. 9-cis violaxanthin formation un...Continue Reading

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Citations

Jun 25, 2013·Journal of Photochemistry and Photobiology. B, Biology·Ewa JanikWaldemar Maksymiec
Mar 19, 2014·Ecotoxicology and Environmental Safety·K Suresh KumarKyung-Hoon Shin
Jul 25, 2013·Biometals : an International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine·Nathalie VerbruggenClaire-Lise Meyer
Jul 8, 2015·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Alberto Mezzetti
Oct 17, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Tonya D AndreevaStefka G Taneva
Jul 19, 2011·The New Phytologist·Christian HermansNathalie Verbruggen
Mar 31, 2015·Environmental Science and Pollution Research International·Xiulian ZhaoJianfeng Liu
Oct 16, 2014·Photosynthesis Research·Eugene A LysenkoVictor V Kusnetsov
Nov 14, 2016·Environmental Science and Pollution Research International·Gülriz BayçuMichael Moustakas
Feb 16, 2021·Frontiers in Plant Science·Izhar MuhammadFeng Bai Li
Apr 4, 2021·Plants·Paola I Angulo-BejaranoRocío Cruz-Ortega
Jul 30, 2017·International Journal of Biological Macromolecules·Shumaila KhanBilqees Bano

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