Isolation and expression of two genes encoding eukaryotic release factor 1 from Paramecium tetraurelia

Stephanie Kervestin, Olivier A. Garnier, Andrey L. Karamyshev, Koichi Ito, Yoshikazu Nakamura, Eric Meyer, Olivier Jean-Jean

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Paramecium tetraurelia, like some other ciliate species, uses an alternative nuclear genetic code where UAA and UAG are translated as glutamine and UGA is the only stop codon. It has been postulated that the use of stop codons as sense codons is dependent on the presence of specific tRNAs and on modification of eukaryotic release factor one (eRF1), a factor involved in stop codon recognition during translation termination. We describe here the isolation and characterisation of two genes, eRF1-a and eRF1-b, coding for eRF1 in P. tetraurelia. The two genes are very similar, both in genomic organization and in sequence, and might result from a recent duplication event. The two coding sequences are 1,314 nucleotides long, and encode two putative proteins of 437 amino acids with 98.5% identity. Interestingly, when compared with the eRF1 sequences either of ciliates having the same variant genetic code, or of other eukaryotes, the eRF1 of P. tetraurelia exhibits significant differences in the N-terminal region, which is thought to interact with stop codons. We discuss here the consequences of these changes in the light of recent models proposed to explain the mechanism of stop codon recognition in eukaryotes. Besides, analysis of the expression of the two genes by Northern blotting and primer extension reveals that these genes exhibit a differential expression during vegetative growth and autogamy.

Original languageEnglish (US)
Pages (from-to)374-382
Number of pages9
JournalJournal of Eukaryotic Microbiology
Volume49
Issue number5
StatePublished - Sep 2002

Fingerprint

Paramecium tetraurelia
Terminator Codon
stop codon
Gene Expression
Genetic Code
genetic code
Eukaryota
genes
Ciliophora
eukaryotic cells
Genes
autogamy
Transfer RNA
Glutamine
codons
Codon
Northern blotting
glutamine
Northern Blotting
translation (genetics)

Keywords

  • Alternative genetic code
  • Autogamy
  • Differential gene expression
  • eRF1
  • Macronuclear DNA
  • Stop codons
  • Transcription start sites
  • Translation termination
  • Vegetative growth

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Applied Microbiology and Biotechnology
  • Agricultural and Biological Sciences (miscellaneous)
  • Microbiology

Cite this

Kervestin, S., Garnier, O. A., Karamyshev, A. L., Ito, K., Nakamura, Y., Meyer, E., & Jean-Jean, O. (2002). Isolation and expression of two genes encoding eukaryotic release factor 1 from Paramecium tetraurelia. Journal of Eukaryotic Microbiology, 49(5), 374-382.

Isolation and expression of two genes encoding eukaryotic release factor 1 from Paramecium tetraurelia. / Kervestin, Stephanie; Garnier, Olivier A.; Karamyshev, Andrey L.; Ito, Koichi; Nakamura, Yoshikazu; Meyer, Eric; Jean-Jean, Olivier.

In: Journal of Eukaryotic Microbiology, Vol. 49, No. 5, 09.2002, p. 374-382.

Research output: Contribution to journalArticle

Kervestin, S, Garnier, OA, Karamyshev, AL, Ito, K, Nakamura, Y, Meyer, E & Jean-Jean, O 2002, 'Isolation and expression of two genes encoding eukaryotic release factor 1 from Paramecium tetraurelia', Journal of Eukaryotic Microbiology, vol. 49, no. 5, pp. 374-382.
Kervestin S, Garnier OA, Karamyshev AL, Ito K, Nakamura Y, Meyer E et al. Isolation and expression of two genes encoding eukaryotic release factor 1 from Paramecium tetraurelia. Journal of Eukaryotic Microbiology. 2002 Sep;49(5):374-382.
Kervestin, Stephanie ; Garnier, Olivier A. ; Karamyshev, Andrey L. ; Ito, Koichi ; Nakamura, Yoshikazu ; Meyer, Eric ; Jean-Jean, Olivier. / Isolation and expression of two genes encoding eukaryotic release factor 1 from Paramecium tetraurelia. In: Journal of Eukaryotic Microbiology. 2002 ; Vol. 49, No. 5. pp. 374-382.
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