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J Bacteriol. Jan 1978; 133(1): 240–250.
PMCID: PMC222000

Composition and Characterization of tRNA from Methanococcus vannielii.


Purified bulk tRNA from Methanococcus vanielii (carbon source, formate) showed variation in the modified nucleoside pattern reported for Escherichia coli as analyzed by both ion-exchange and thin-layer chromatography. Ribothymidine and 7-methylguanosine were absent; 1-methyladenosine, 1-methylguanosine, N2-methylguanosine, N2,N2-dimethylguanosine, thiolated nucleosides, pseudouridine, dihydrouridine, and O2'-methylcytidine were quantitated. In vitro methylation by M. Vannielii extracts with S-adenosylmethionine and undermethylated E. coli tRNA revealed active tRNA methyltransferases for formation of methylated residues found in native M. vannielii tRNA, but none for the formation of 7-methylguanosine or ribothymidine. The native M. vannielii tRNA became methylated in the 7-methylguanosine position by E. Coli extracts, but ribothymidine was not formed. Both M. vannielii and E. coli tRNA methyltransferases produced unidentified methylated residues in tRNA's lacking or deficient in ribothymidine.

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