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. 1985 May 10;13(9):3273–3284. doi: 10.1093/nar/13.9.3273

Nucleotide sequences of three tRNA genes encoded in Tetrahymena mitochondrial DNA.

Y Suyama
PMCID: PMC341234  PMID: 2987880

Abstract

Nucleotide sequences of three cloned restriction fragments of Tetrahymena mtDNA which showed hybridization with mitochondrial tRNA have been determined. EcoRI fragment 5 (4.1 kbp) contains the tRNAphe gene sequence with anticodon GAA; Hind III fragment 6 (2.0 kbp) the tRNAhis with anticodon GTG; and EcoRI fragment 7 (1.9 kbp) the tRNAtrp with anticodon TCA. The CCA end is not encoded. All three tRNAs show usual features with common invariant and semi-invariant bases and can be folded into a cloverleaf structure with standard loops and regular base pairs in the stems. However, some minor irregular features are present including several GT pairs and an unmatched TT in the stems, and TCC instead of T psi C. All exhibit high G+C contents (about 50%); in contrast, the flanking regions are extremely A+T rich (about 80%). Several short coding frames can be deduced in these sequences, but their significance is not known.

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Selected References

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