The Main Structural and Functional Characteristics of Photosystem-II-Enriched Membranes Isolated from Wild Type and cia3 Mutant Chlamydomonas reinhardtii

Photosystem II (PSII)-enriched membranes retain the original PSII architecture in contrast to PSII cores or PSII supercomplexes, which are usually isolated from . Here, we present data that fully characterize the structural and functional properties of PSII complexes in isolated PSII-enriched membra...

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Bibliographic Details
Published in:Life (Basel, Switzerland) Switzerland), 2020-05, Vol.10 (5), p.63
Main Authors: Terentyev, Vasily V, Shukshina, Anna K, Ashikhmin, Aleksandr A, Tikhonov, Konstantin G, Shitov, Alexandr V
Format: Article
Language:English
Subjects:
Algae
Binding sites
CAH3
Carotenoids
Chlamydomonas reinhardtii
Chlorophyll
Chloroplasts
Cyanobacteria
Cytochrome
cytochrome b559
Cytochromes
Dark adaptation
Deficient mutant
Enrichment
Membranes
Oxidation
pH effects
Photosynthesis
Photosystem II
Proteins
Reaction centers
Structure-function relationships
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Summary:Photosystem II (PSII)-enriched membranes retain the original PSII architecture in contrast to PSII cores or PSII supercomplexes, which are usually isolated from . Here, we present data that fully characterize the structural and functional properties of PSII complexes in isolated PSII-enriched membranes from . The preparations were isolated from wild-type (WT) and CAH3-deficient mutant as the influence of CAH3 on the PSII function was previously proposed. Based on the equal chlorophyll content, the PSII-enriched membranes from WT and have the same amount of reaction centers (RCs), cytochrome b559, subunits of the water-oxidizing complex, Mn ions, and carotenes. They differ in the ratio of other carotenoids, the parts of low/intermediate redox forms of cytochrome b559, and the composition of outer light-harvesting complexes. The preparations had 40% more chlorophyll molecules per RC compared to higher plants. Functionally, PSII-enriched membranes from WT and show the same photosynthetic activity at optimal pH 6.5. However, the preparations from contained more closed RCs even at pH 6.5 and showed more pronounced suppression of PSII photosynthetic activity at shift pH up to 7.0, established in the lumen of dark-adapted cells. Nevertheless, the PSII photosynthetic capacities remained the same.
ISSN:2075-1729
2075-1729
DOI:10.3390/life10050063