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• W4220783632 endingPage "654" @default.
• W4220783632 startingPage "654" @default.
• W4220783632 abstract "Cyanobacteria evolved the ability to perform oxygenic photosynthesis using light energy to reduce CO2 from electrons extracted from water and form nutrients. These organisms also developed light-dependent redox regulation through the Trx system, formed by thioredoxins (Trxs) and thioredoxin reductases (TRs). Trxs are thiol-disulfide oxidoreductases that serve as reducing substrates for target enzymes involved in numerous processes such as photosynthetic CO2 fixation and stress responses. We focus on the evolutionary diversity of Trx systems in cyanobacteria and discuss their phylogenetic relationships. The study shows that most cyanobacteria contain at least one copy of each identified Trx, and TrxA is the only one present in all genomes analyzed. Ferredoxin thioredoxin reductase (FTR) is present in all groups except Gloeobacter and Prochlorococcus, where there is a ferredoxin flavin-thioredoxin reductase (FFTR). Our data suggest that both TRs may have coexisted in ancestral cyanobacteria together with other evolutionarily related proteins such as NTRC or DDOR, probably used against oxidative stress. Phylogenetic studies indicate that they have different evolutionary histories. As cyanobacteria diversified to occupy new habitats, some of these proteins were gradually lost in some groups. Finally, we also review the physiological relevance of redox regulation in cyanobacteria through the study of target enzymes." @default.
• W4220783632 created "2022-04-03" @default.
• W4220783632 creator A5040985308 @default.
• W4220783632 creator A5064029556 @default.
• W4220783632 creator A5067270184 @default.
• W4220783632 date "2022-03-28" @default.
• W4220783632 modified "2023-09-30" @default.
• W4220783632 title "Exploring the Diversity of the Thioredoxin Systems in Cyanobacteria" @default.
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