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Nucleic Acids Research, 1982, Vol. 10, No. 18 5663-5672
© 1982

MOLECULAR BIOLOGY

The transfer RNA of certain Enterobacteriacae contain 2-methylthiozeatin riboside (ms2io6A) an isopentenyl adenosine derivative

Janice J. Janzer, J. Philip Raney and Barry D. McLennan

Department of Biochemistry, University of Saskatchewan Saskatoon, Saskatchewan, Canada, S7N 0WO

Received May 13, 1982. Revised August 20, 1982. Accepted August 20, 1982.

Isopentenyl adenosine derivatives are always located adjacent to the 3'end of the anticodon in transfer RNA and have been implicated in certain biological functions. In the enteric bacterium, E. coli, the derivative is ms2i6A whereas in some plant associated bacteria the derivative is the hydroxylated form, ms2io6A. Anti-i6A immunoadsorbent chromatography has been employed to detect isopentenyl adenosine compounds. In the present study we show that the transfer RNA of three species of enteric bacteria, S. typhimurium, K. pneumoniae, and S. marcescens contains both ms2io6 and ms2i6A. Under the growth conditions utilized the ms2io6A is predominant. The presence of ms2io6A in Enterobacteriacae is particularly noteworthy since in previous work it has been found only in plant-associated species of bacteria.


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