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Nucleic Acids Research, 1977, Vol. 4, No. 12 4063-4076
© 1977

Articles

Detection of nucleoside Q precursor in methyl-deficient E.coli tRNA

Norithiro Okada, Tomoko Yasuda and Susumu Nishimura

Biology Division, National Cancer Center Research Institute Tsukiji 5-1, Chuo-ku, Tokyo, Japan

Received July 28, 1977. 32p-Labeled tRNAAsn was isolated from methyl-deficient E. coli tRNA. Nucleotide sequence analysis showed that tRNAAsn contains three derivatives of the Q nucleoside, possibly Q precursors, in addition to guanosine in the first position of the anticodon. One of the Q precursors was isolated on a large scale. Its UV spectra were identical with those of normal Q, indicating that the 7-deazaguanosine structure having a side chain at position C-7 is complete in the Q precursor. No radioactivity was incorporated into Q or Q precursors from either [methyl-14C]methionine [1-14C]methionine or [U-14C]methionine showing that methionine was not directly involved in the formation of Q.


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