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The archaeal parasite Nanoarchaeum equitans was found to generate five tRNA species via a unique process requiring the assembly of seperate 5' and 3' tRNA halves Randau, L., Munch, R., Hohn, M.J., Jahn, D. and Soll, D. (2005) Nanoarchaeum equitans creates functional tRNAs from separate genes for their 5'- and 3'-halves. Nature 433, 537-541. Biochemical evidence was missing for one of the computationally-predicted, joined tRNAs designated as tRNA(Trp). Our RT-PCR and sequencing results identify this tRNA as tRNA(Lys) (CUU) joined at the alternative position between bases 30 and 31. We show that the intron-containing tRNA(Trp) was misidentified in the initial Nanoarchaeum equitans genome annotation E. Waters et al. (2003) The genome of Nanoarchaeum equitans: insights into early archaeal evolution and derived parasitism. Proc. Natl. Acad. Sci. USA 100, 12984-12988. Along with a previously unidentified joined tRNA(Gln) (UUG), Nanoarchaeum equitans exhibits 44 tRNAs and is enabled to read all 61 sense codons. Features unique to this set of tRNA molecules are discussed.
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