Photosynthetic pigment localization and thylakoid membrane morphology are altered in Synechocystis 6803 phycobilisome mutants.

Plant Physiology
Aaron M CollinsJerilyn A Timlin

Abstract

Cyanobacteria are oxygenic photosynthetic prokaryotes that are the progenitors of the chloroplasts of algae and plants. These organisms harvest light using large membrane-extrinsic phycobilisome antenna in addition to membrane-bound chlorophyll-containing proteins. Similar to eukaryotic photosynthetic organisms, cyanobacteria possess thylakoid membranes that house photosystem (PS) I and PSII, which drive the oxidation of water and the reduction of NADP+, respectively. While thylakoid morphology has been studied in some strains of cyanobacteria, the global distribution of PSI and PSII within the thylakoid membrane and the corresponding location of the light-harvesting phycobilisomes are not known in detail, and such information is required to understand the functioning of cyanobacterial photosynthesis on a larger scale. Here, we have addressed this question using a combination of electron microscopy and hyperspectral confocal fluorescence microscopy in wild-type Synechocystis species PCC 6803 and a series of mutants in which phycobilisomes are progressively truncated. We show that as the phycobilisome antenna is diminished, large-scale changes in thylakoid morphology are observed, accompanied by increased physical segregation of...Continue Reading

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Citations

Oct 18, 2013·Photosynthesis Research·Michelle LibertonHimadri B Pakrasi
Dec 21, 2012·The Journal of Biological Chemistry·Michelle LibertonHimadri B Pakrasi
Jul 17, 2012·FEBS Letters·Min ChenRobert D Willows
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Jul 16, 2014·Frontiers in Bioengineering and Biotechnology·Poul Erik Jensen, Dario Leister
Jun 17, 2014·Biotechnology and Bioengineering·Aaron M CollinsJerilyn A Timlin
Apr 17, 2014·FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology·Bruno DeméJuliette Jouhet
Jul 29, 2020·Photosynthesis Research·Sindhujaa VajravelSashka Krumova
Mar 19, 2013·Physical Review Letters·Daewoong NamChangyong Song
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Jun 26, 2021·Metabolic Engineering Communications·Anton PuzorjovAlistair J McCormick

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