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. 1993 Dec 11;21(24):5589–5594. doi: 10.1093/nar/21.24.5589

The long extra arms of human tRNA((Ser)Sec) and tRNA(Ser) function as major identify elements for serylation in an orientation-dependent, but not sequence-specific manner.

X Q Wu 1, H J Gross 1
PMCID: PMC310520  PMID: 8284203

Abstract

Selenocysteine tRNA [tRNA((Ser)Sec)] is charged with serine by the same seryl-tRNA synthetase (SerRS) as the canonical serine tRNAs. Using site-directed mutagenesis, we have introduced a series of mutations into human tRNA((Ser)Sec) and tRNA(Ser) in order to study the identity elements of tRNA((Ser)Sec) for serylation and the effect of the orientation of the extra arm. Our results show that the long extra arm is one of the major identity elements for both tRNA(Ser) and tRNA((Ser)Sec) and gel retardation assays reveal that it appears to be a prerequisite for binding to the cognate synthetase. The long extra arm functions in an orientation-dependent, but not in a sequence-specific manner. The discriminator base G73 is another important identity element of tRNA((Ser)Sec), whereas the T- and D-arms play a minor role for the serylation efficiency.

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Selected References

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