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Thylakoid membrane perforations and connectivity enable intracellular traffic in cyanobacteria
Year:
2007
Source of publication :
eLife
Authors :
Charuvi, Dana
;
.
Volume :
26
Co-Authors:
Nevo, R., Department of Biological Chemistry, Weizmann Institute of Science, Rehovot, Israel
Charuvi, D., Department of Biological Chemistry, Weizmann Institute of Science, Rehovot, Israel, Robert H. Smith Institute of Plant Sciences and Genetics in Agriculture, Hebrew University of Jerusalem, Rehovot, Israel
Shimoni, E., Electron Microscopy Unit, Weizmann Institute of Science, Rehovot, Israel
Schwarz, R., Faculty of Life Sciences, Bar-Ilan University, Ramat Gan, Israel
Kaplan, A., Institute of Life Sciences, Avron-Even-Ari Minerva Center for Photosynthesis Research, Hebrew University of Jerusalem, Jerusalem, Israel
Ohad, I., Institute of Life Sciences, Avron-Even-Ari Minerva Center for Photosynthesis Research, Hebrew University of Jerusalem, Jerusalem, Israel
Reich, Z., Department of Biological Chemistry, Weizmann Institute of Science, Rehovot, Israel, Department of Biological Chemistry, Weizmann Institute of Science, Rehovot 76100, Israel
Facilitators :
From page:
1467
To page:
1473
(
Total pages:
7
)
Abstract:
Cyanobacteria, the progenitors of plant and algal chloroplasts, enabled aerobic life on earth by introducing oxygenic photosynthesis. In most cyanobacteria, the photosynthetic membranes are arranged in multiple, seemingly disconnected, concentric shells. In such an arrangement, it is unclear how intracellular trafficking proceeds and how different layers of the photosynthetic membranes communicate with each other to maintain photosynthetic homeostasis. Using electron microscope tomography, we show that the photosynthetic membranes of two distantly related cyanobacterial species contain multiple perforations. These perforations, which are filled with particles of different sizes including ribosomes, glycogen granules and lipid bodies, allow for traffic throughout the cell. In addition, different layers of the photosynthetic membranes are joined together by internal bridges formed by branching and fusion of the membranes. The result is a highly connected network, similar to that of higher-plant chloroplasts, allowing water-soluble and lipid-soluble molecules to diffuse through the entire membrane network. Notably, we observed intracellular membrane-bounded vesicles, which were frequently fused to the photosynthetic membranes and may play a role in transport to these membranes. © 2007 European Molecular Biology Organization | All Rights Reserved.
Note:
Related Files :
algae
cell membrane
membrane fusion
membrane transport
Models, Biological
photosynthesis
Show More
Related Content
More details
DOI :
10.1038/sj.emboj.7601594
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
19768
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:31
Scientific Publication
Thylakoid membrane perforations and connectivity enable intracellular traffic in cyanobacteria
26
Nevo, R., Department of Biological Chemistry, Weizmann Institute of Science, Rehovot, Israel
Charuvi, D., Department of Biological Chemistry, Weizmann Institute of Science, Rehovot, Israel, Robert H. Smith Institute of Plant Sciences and Genetics in Agriculture, Hebrew University of Jerusalem, Rehovot, Israel
Shimoni, E., Electron Microscopy Unit, Weizmann Institute of Science, Rehovot, Israel
Schwarz, R., Faculty of Life Sciences, Bar-Ilan University, Ramat Gan, Israel
Kaplan, A., Institute of Life Sciences, Avron-Even-Ari Minerva Center for Photosynthesis Research, Hebrew University of Jerusalem, Jerusalem, Israel
Ohad, I., Institute of Life Sciences, Avron-Even-Ari Minerva Center for Photosynthesis Research, Hebrew University of Jerusalem, Jerusalem, Israel
Reich, Z., Department of Biological Chemistry, Weizmann Institute of Science, Rehovot, Israel, Department of Biological Chemistry, Weizmann Institute of Science, Rehovot 76100, Israel
Thylakoid membrane perforations and connectivity enable intracellular traffic in cyanobacteria
Cyanobacteria, the progenitors of plant and algal chloroplasts, enabled aerobic life on earth by introducing oxygenic photosynthesis. In most cyanobacteria, the photosynthetic membranes are arranged in multiple, seemingly disconnected, concentric shells. In such an arrangement, it is unclear how intracellular trafficking proceeds and how different layers of the photosynthetic membranes communicate with each other to maintain photosynthetic homeostasis. Using electron microscope tomography, we show that the photosynthetic membranes of two distantly related cyanobacterial species contain multiple perforations. These perforations, which are filled with particles of different sizes including ribosomes, glycogen granules and lipid bodies, allow for traffic throughout the cell. In addition, different layers of the photosynthetic membranes are joined together by internal bridges formed by branching and fusion of the membranes. The result is a highly connected network, similar to that of higher-plant chloroplasts, allowing water-soluble and lipid-soluble molecules to diffuse through the entire membrane network. Notably, we observed intracellular membrane-bounded vesicles, which were frequently fused to the photosynthetic membranes and may play a role in transport to these membranes. © 2007 European Molecular Biology Organization | All Rights Reserved.
Scientific Publication
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