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Proteins, glycerolipids and carotenoids in the functional photosystem II architecture
- Source :
- Frontiers in Bioscience. 16:619
- Publication Year :
- 2011
- Publisher :
- IMR Press, 2011.
-
Abstract
- Photosystem II (PSII), the first supercomplex of the electron transport chain, governs the energy transfer using harvested light energy, which is transformed into biochemical energy. Phosphatidylglycerol and sulfoquinovosyl diacylglycerol, the anionic lipids of photosynthetic organisms, together with a neutral lipid, digalactosyldiacylglycerol, assist in the assembly of photosynthetic complexes. These lipids and carotenoids serve as mortar for the proteins which act as bricks in the construction of the active photosynthetic machinery, and they have determinative roles in the oligomerization of protein subunits. X-ray crystallographic localization of glycerolipids and carotenoids revealed that they are present at functionally and structurally important sites of both the PSI and PSII reaction centers. Phosphatidylglycerol is involved in the formation of the reaction-center oligomers and controls electron transport at the acceptor site of PSII. Digalactosyldiacylglycerol, together with phosphatidylglycerol, is involved in the electron transport at the donor site. Phosphatidylglycerol and carotenoids are needed to glue CP43 to the reaction center core. Carotenoids are protective agents, which prevent photosynthetic complexes from degradation caused by reactive oxygen species.
- Subjects :
- Photosynthetic reaction centre
Photoinhibition
Photosystem II
Photosynthetic Reaction Center Complex Proteins
Arabidopsis
macromolecular substances
Photosynthesis
Photosystem I
Thylakoids
Sulfoquinovosyl diacylglycerol
chemistry.chemical_compound
Botany
Carotenoid
Synechococcus
chemistry.chemical_classification
Phosphatidylglycerol
Galactolipids
Chlamydomonas
Photosystem II Protein Complex
food and beverages
Phosphatidylglycerols
beta Carotene
Carotenoids
chemistry
Biophysics
lipids (amino acids, peptides, and proteins)
Glycolipids
Subjects
Details
- ISSN :
- 10934715 and 10939946
- Volume :
- 16
- Database :
- OpenAIRE
- Journal :
- Frontiers in Bioscience
- Accession number :
- edsair.doi.dedup.....d67c1e3cb02834ac22e5ea263f2dd460