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Shiraishi, Miyako; Hidaka, Michihi; Iwai, Shigenori
Bioscience, biotechnology, and biochemistry, 02/2022, Letnik: 86, Številka: 3Journal Article
Endonuclease V (EndoV) is an inosine-specific endonuclease which is highly conserved in all domains of life: Bacteria, Archaea, and Eukarya; and, therefore, may play an important role in nucleic acid processes. It is currently thought that bacterial EndoVs are involved in DNA repair, while eukaryotic EndoVs are involved in RNA editing based on the differences in substrate preferences. However, the role of EndoV proteins, particularly in the archaeal domain, is still poorly understood. Here, we explored the biochemical properties of EndoV from the hyperthermophilic archaeon Thermococcus kodakarensis (TkoEndoV). We show that TkoEndoV has a strong preference for RNA over DNA. Further, we synthesized 1-methylinosine-containing RNA that is a simple TΨC loop mimic of archaeal tRNA and found that TkoEndoV discriminates between 1-methylinosine and inosine, and selectively acts on inosine. Our findings suggest a potential role of archaeal EndoV in the regulation of inosine-containing RNA.
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in: SICRIS
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