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Nucleic Acids Research, 1978, Vol. 5, No. 7 2289-2296
© 1978

Articles

Structure determination of a nucleoside Q precursor isolated from E. coli tRNA: 7-{aminomethyl)-7-deazaguanosine

Norihiro Okada, Shigeru Noguchi, Susumu Nishimura, Tadaaki Ohgi*, Toshio Goto*, P.F. Crain** and James A. McCloskey**

Biology Division, National Cancer Center Research Institute Tokyo, Japan *Department of Agricultural Chemistry, Nagoya University Nagoya, Japan **Departments of Medicinal Chemistry and Biochemistry, University of Utah Salt Lake City, UT 84112, USA

Received May 15, 1978. A precursor of modified nucleoside Q isolated from E. coli methyl-deficient tRNA was determined to be 7-(aminomethyl)-7-deazaguanosine. The structure was deduced by means of its chromatographic and electrophoretic mobilities, and UV and mass spectra, in addition to comparison with the synthesized authentic compound. The same molecule is also found in tRNA of an E. coli mutant selected for deficient synthesis of modified nucleosides.


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