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• W3201819693 abstract "Summary Cytochrome (Cyt) b 559 is a key component of the photosystem II complex (PSII) that is essential for its proper functioning and assembly. Site‐directed mutants of the model cyanobacterium Synechocystis sp. PCC6803 with mutated heme axial ligands of Cyt b 559 have little PSII and are therefore unable to grow photoautotrophically. Here we describe two types of Synechocystis autotrophic transformants that retained the same mutations in Cyt b 559 but are able to accumulate PSII and grow photoautotrophically. Whole‐genome sequencing revealed that all of these autotrophic transformants carried a variable number of tandem repeats (from 5 to 15) of chromosomal segments containing the psbEFLJ operon. RNA‐seq analysis showed greatly increased transcript levels of the psbEFLJ operon in these autotrophic transformants. Multiple copies of the psbEFLJ operon in these transformants were only maintained during autotrophic growth, while its copy numbers gradually decreased under photoheterotrophic conditions. Two‐dimensional PAGE analysis of membrane proteins revealed a strong deficiency in PSII complexes in the Cyt b 559 mutants that was reversed in the autotrophic transformants. These results illustrate how tandem gene amplification restores PSII accumulation and photoautotrophic growth in Cyt b 559 mutants of cyanobacteria, and may serve as an important adaptive mechanism for cyanobacterial survival." @default.
• W3201819693 created "2021-10-11" @default.
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• W3201819693 date "2021-10-30" @default.
• W3201819693 modified "2023-10-01" @default.
• W3201819693 title "Tandem gene amplification restores photosystem II accumulation in cytochrome <i>b</i> ₅₅₉ mutants of cyanobacteria" @default.
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• W3201819693 doi "https://doi.org/10.1111/nph.17785" @default.
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