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• W4249457691 abstract "We reported previously that mitochondrial tyrosyl-tRNA synthetase, which is encoded by the nuclear gene cyt-18 in Neurospora crassa, functions in splicing several group I introns in N. crassa mitochondria (R. A. Akins and A. M. Lambowitz, Cell 50:331-345, 1987). Two mutants in the cyt-18 gene (cyt-18-1 and cyt-18-2) are defective in both mitochondrial protein synthesis and splicing, and an activity that splices the mitochondrial large rRNA intron copurifies with a component of mitochondrial tyrosyl-tRNA synthetase. Here, we used antibodies against different trpE-cyt-18 fusion proteins to identify the cyt-18 gene product as a basic protein having an apparent molecular mass of 67 kilodaltons (kDa). Both the cyt-18-1 and cyt-18-2 mutants contain relatively high amounts of inactive cyt-18 protein detected immunochemically. Biochemical experiments show that the 67-kDa cyt-18 protein copurifies with splicing and synthetase activity through a number of different column chromatographic procedures. Some fractions having splicing activity contain only one or two prominent polypeptide bands, and the cyt-18 protein is among the few, if not only, major bands in common between the different fractions that have splicing activity. Phosphocellulose columns resolve three different forms or complexes of the cyt-18 protein that have splicing or synthetase activity or both. Gel filtration experiments show that splicing activity has a relatively small molecular mass (peak at 150 kDa with activity trailing to lower molecular masses) and could correspond simply to dimers or monomers, or both, of the cyt-18 protein. Finally, antibodies against different segments of the cyt-18 protein inhibit splicing of the large rRNA intron in vitro. Our results indicate that both splicing and tyrosyl-tRNA synthetase activity are associated with the same 67-kDa protein encoded by the cyt-18 gene. This protein is a key constituent of splicing activity; it functions directly in splicing, and few, if any, additional components are required for splicing the large rRNA intron." @default.
• W4249457691 created "2022-05-12" @default.
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• W4249457691 date "1989-05-01" @default.
• W4249457691 modified "2023-09-24" @default.
• W4249457691 title "Involvement of tyrosyl-tRNA synthetase in splicing of group I introns in Neurospora crassa mitochondria: biochemical and immunochemical analyses of splicing activity" @default.
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• W4249457691 doi "https://doi.org/10.1128/mcb.9.5.2089-2104.1989" @default.
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