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Related Experiment Videos

Peptide chain termination with mammalian release factor.

J L Goldstein, A L Beaudet, C T Caskey

    Proceedings of the National Academy of Sciences of the United States of America
    |September 1, 1970
    PubMed
    Summary
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    Researchers identified a mammalian release factor that, with a specific RNA template, releases N-formylmethionine. This suggests UAA acts as a terminator codon in mammalian cells, crucial for peptide chain termination.

    Area of Science:

    • Molecular Biology
    • Genetics
    • Protein Synthesis

    Background:

    • Peptide chain termination is a critical step in protein synthesis.
    • Understanding terminator codons is essential for deciphering the genetic code.
    • Mammalian systems for studying translation termination in vitro are limited.

    Purpose of the Study:

    • To develop an in vitro method for studying peptide chain termination in mammals.
    • To isolate and characterize a proteinaceous release factor involved in mammalian translation termination.
    • To identify potential terminator codons in mammalian cells.

    Main Methods:

    • Isolation of a proteinaceous release factor from rabbit reticulocyte extracts.
    • In vitro assays using the release factor, a polyribonucleotide template (U and A bases), and mammalian [N-formylmethionyl-tRNA(f).ribosome] intermediates.

    Related Experiment Videos

  • Analysis of N-formylmethionine release.

    • Main Results:

    • A proteinaceous release factor was successfully isolated from rabbit reticulocyte extracts.
    • The isolated factor, in conjunction with a polyribonucleotide template, stimulated the release of N-formylmethionine.
    • This release occurred from mammalian [N-formylmethionyl-tRNA(f).ribosome] intermediates.

    Conclusions:

    • The study provides a method for in vitro investigation of mammalian peptide chain termination.
    • The findings suggest that the sequence UAA functions as a terminator codon in mammalian cells.
    • This discovery contributes to the understanding of translational control mechanisms in mammals.