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- W2154689780 startingPage "3445" @default.
- W2154689780 abstract "This paper presents the first example of a complete gene sequence coding for and expressing a biologically functional human tRNA methyltransferase: the hTRM1 gene product tRNA(m(2)(2)G)dimethyltransferase. We isolated a human cDNA (1980 bp) made from placental mRNA coding for the full-length (659 amino acids) human TRM1 polypeptide. The sequence was fairly similar to Saccharomyces cerevisiae Trm1p, to Caenorhabditis elegans TRM1p and to open reading frames (ORFs) found in mouse and a plant (Arabidopsis thaliana) DNA. The human TRM1 gene was expressed at low temperature in Escherichia coli as a functional recombinant protein, able to catalyze the formation of dimethylguanosine in E.coli tRNA in vivo. It targeted solely position G(26) in T7 transcribed spliced and unspliced human tRNA(Tyr) in vitro and in yeast trm1 mutant tRNA. Thus, the human TRM1 protein is a tRNA(m(2)(2)G(26))dimethyltransferase. Compared with yeast Trm1p, hTRM1p has a C-terminal protrusion of approximately 90 amino acids which shows similarities to a mouse protein related to RNA splicing. A deletion of these 90 C-terminal amino acids left the modification activity in vitro intact. Among point mutations in the hTRM1 gene, only those located in conserved regions of hTRM1p completely eliminated modification activity." @default.
- W2154689780 created "2016-06-24" @default.
- W2154689780 creator A5060006875 @default.
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- W2154689780 date "2000-09-15" @default.
- W2154689780 modified "2023-10-10" @default.
- W2154689780 title "The human tRNA(m22G26)dimethyltransferase: functional expression and characterization of a cloned hTRM1 gene" @default.
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- W2154689780 doi "https://doi.org/10.1093/nar/28.18.3445" @default.
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