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[How translation termination factor eRF1 Euplotes does not recognise UGA stop codon].

S A Lekomtsev, P M Kolosov, L Iu Frolova

    Molekuliarnaia Biologiia
    |March 6, 2008
    PubMed
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    Specific regions in the N-terminal domain of Euplotes aediculatus eRF1 restrict its stop codon recognition, enabling variant genetic codes. This finding sheds light on early evolutionary events in ciliate translation termination.

    Area of Science:

    • Molecular Biology
    • Genetics
    • Evolutionary Biology

    Context:

    • Eukaryotic translation termination typically involves a single class-1 translation termination factor (eRF1) decoding all three stop codons (UAA, UAG, UGA).
    • Some ciliates exhibit variant genetic codes where stop codons are reassigned to encode amino acids, deviating from the universal code.
    • This reassignment implies modifications in the eRF1 protein, particularly in its N-terminal domain responsible for stop codon recognition.

    Purpose:

    • To identify specific amino acid residues in Euplotes aediculatus eRF1 that confer specificity towards UAR (UAA, UAG) stop codons.
    • To investigate the structural basis for restricted stop codon recognition in ciliate eRF1s.

    Summary:

    • Researchers constructed chimeric eRF1 proteins by swapping N-terminal domain sequences between Euplotes aediculatus and human eRF1.

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  • Functional analysis revealed that two specific regions (residues 38-50 and 123-145) in the E. aediculatus eRF1 N-terminal domain are crucial for restricting its specificity to UAR codons.
  • These findings suggest that restricted eRF1 specificity may have been an early evolutionary event facilitating stop codon reassignment in ciliates.

    • Impact:

    • Provides insights into the molecular mechanisms underlying genetic code variations.
    • Highlights the role of protein domain evolution in shaping genetic systems.
    • Suggests a potential evolutionary pathway for the emergence of non-universal genetic codes in ciliates.