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- W3048298631 abstract "Abstract Nucleic acid-binding proteins of the Sac10b family, also known as Alba, are widely distributed in Archaea. However, the physiological roles of these proteins have yet to be clarified. Here, we show that Sis10b, a member of the Sac10b family from the hyperthermophilic archaeon Sulfolobus islandicus, was active in RNA strand exchange, duplex RNA unwinding in vitro and RNA unfolding in a heterologous host cell. This protein exhibited temperature-dependent binding preference for ssRNA over dsRNA and was more efficient in RNA unwinding and RNA unfolding at elevated temperatures. Notably, alanine substitution of a highly conserved basic residue (K) at position 17 in Sis10b drastically reduced the ability of this protein to catalyse RNA strand exchange and RNA unwinding. Additionally, the preferential binding of Sis10b to ssRNA also depended on the presence of K17 or R17. Furthermore, normal growth was restored to a slow-growing Sis10b knockdown mutant by overproducing wild-type Sis10b but not by overproducing K17A in this mutant strain. Our results indicate that Sis10b is an RNA chaperone that likely functions most efficiently at temperatures optimal for the growth of S. islandicus, and K17 is essential for the chaperone activity of the protein." @default.
- W3048298631 created "2020-08-13" @default.
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- W3048298631 date "2020-08-06" @default.
- W3048298631 modified "2023-10-16" @default.
- W3048298631 title "The Sac10b homolog from Sulfolobus islandicus is an RNA chaperone" @default.
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- W3048298631 doi "https://doi.org/10.1093/nar/gkaa656" @default.
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