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Nucleic Acids Research, 1982, Vol. 10, No. 18 5649-5662
© 1982

MOLECULAR BIOLOGY

c/s 2-Methylthio-ribosylzeatin (ms2io6 is present in the transfer RNA of Salmonella ryphimurium, but not Escherichis coti

Martin Buck, James A. McCloskey*, Brenda Basile* and Bruce N. Ames

Department of Biochemistry, University of California Berkeley, CA 94720 *Departments of Medicinal Chemistry and Biochemistry, University of Utah Salt Lake City, UT 84112, USA

Received June 4, 1982. Revised August 8, 1982. Accepted August 8, 1982.

He have identified the cis isomer of N6-(4-hydroxy-isopentenyl)-2-methylthioadenosine (ms2 io6 A) aa a component of the tRNA of Salmonella typhimurlum. This is the first report of this compound in the tRNA of any member of the Enterobacteriaceae: the nucleoside was previously thought to be found exclusively in plants or plant associated bacteria. Interestingly, all E. coll strains examined were found to lack ms2 io6 A. Evidence is presented which suggests S. typhimurlum tRNA also contains low levels of 5-carboxymethylaminomethyl-2-thiouridine (cmrm5 s2 U) in addition to 5-methylamnomethyl-2-thiouridine (mrm s2 U).


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