Compilation of tRNA sequences.

This compilation presents in a small space the tRNA sequences so far published in order to enable rapid orientation and comparison. The numbering of tRNAPhe from yeast is used as has been done earlier (1) but following the rules proposed by the participants of the Cold Spring Harbor Meeting on tRNA 1978 (2) (Fig. 1). This numbering allows comparisons with the three dimensional structure of tRNAPhe, the only structure known from X-ray analysis. The secondary structure of tRNAs is indicated by specific underlining. In the primary structure a nucleoside followed by a nucleoside in brackets or a modification in brackets denotes that both types of nucleosides can occupy this position. Part of a sequence in brackets designates a piece of sequence not unambiguously analyzed. Rare nucleosides are named according to the IUPAC-IUB rules (for some more complicated rare nucleosides and their identification see Table 1); those with lengthy names are given with the prefix x and specified in the footnotes. Footnotes are numbered according to the coordinates of the corresponding nucleoside and are indicated in the sequence by an asterisk. The references are restricted to the citation of the latest publication in those cases where several papers deal with one sequence. For additional information the reader is referred either to the original literature or to other tRNA sequence compilations (3--7). Mutant tRNAs are dealt with in a separate compilation prepared by J. Celis (see below). The compilers would welcome any information by the readers regarding missing material or erroneous presentation. On the basis of this numbering system computer printed compilations of tRNA sequences in a linear form and in cloverleaf form are in preparation.