7-methylguanosine at the anticodon wobble position of squid mitochondrial tRNA(Ser)GCU: Molecular basis for assignment of AGA/AGG codons as serine in invertebrate mitochondria

Kozo Tomita, Takuya Ueda, Kimitsuna Watanabe

研究成果: Article

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In mitochondria of the squid, Loligo bleekeri, both the AGA and AGG codons are considered to correspond to serine instead of arginine as in the universal genetic code, and its genome encodes a single tRNA(Scr) gene with the anticodon GCT. Therefore, this gene product, tRNA(Ser)GCU, should be able to translate all four AGN (N; U, C, A, and G) codons as serine. To elucidate this recognition mechanism, the tRNA(Ser)GCU was isolated from squid liver and its complete nucleotide sequence determined. The tRNA(Ser)GCU was found to possess 7-methylguanosine (m7G) at the wobble position of the anticodon. This suggests that in the squid mitochondrial system, tRNA(Ser)GCU with the anticodon m7GCU can recognize not only the usual serine codons AGU and AGC, but also the unusual serine codons AGA and AGG, as in the case of starfish mitochondria (Matsuyama et al., J. Biol. Chem. 273 (1988) 3363-3368).

元の言語English
ページ(範囲)78-82
ページ数5
ジャーナルBiochimica et Biophysica Acta - Gene Structure and Expression
1399
発行部数1
DOI
出版物ステータスPublished - 1998 7 30
外部発表Yes

ASJC Scopus subject areas

  • Structural Biology
  • Biophysics
  • Biochemistry
  • Genetics

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