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  • Title: Recognition of individual procaryotic and eucaryotic transfer-ribonucleic acids by B subtilis adenine-1-methyltransferase specific for the dihydrouridine loop.
    Author: Kersten H, Raettig R, Weissenbach J, Dirheimer G.
    Journal: Nucleic Acids Res; 1978 Aug; 5(8):3033-42. PubMed ID: 99729.
    Abstract:
    Bulk tRNA from yeast and Rat liver can be methylated in vitro with -adenosylmethionine and B, subtilis extracts. The sole product formed is 1-methyladenosine (m1A). This tRNA (adenine-1) methyltransferase converts quantitatively the 3'-terminal adenosine-residue in the dihydrouridine-loop of tRNAThr and tRNATyr from yeast into m1A. Out of 16 eucaryotic tRNAs with known sequences 6 accepted methyl groups, all at a molar ratio of 1. These tRNAs have in common an unpaired adenosine-residue at the specific site in the sequence Py-A-A+-G-G-C-m2G. Out of 12 tRNAs from E. coli 6 served as specific substrates. These E. coli tRNAs also have an unpaired adenosine-residue at the 3'-end of the D-loop. Besides restrictions in primary structure intact secondary and tertiary structure is important for recognition of the specific tRNAs by the enzyme.
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