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Cloning of eukaryotic protein synthesis initiation factor genes: isolation and characterization of cDNA clones

P J Nielsen, G K McMaster, H Trachsel

    Nucleic Acids Research
    |October 11, 1985
    PubMed

    Insights

    Researchers identified mouse cDNA clones for protein synthesis initiation factor 4A (eIF-4A) using monoclonal antibodies. Analysis revealed two distinct mRNA species encoding eIF-4A in mouse and HeLa cells, confirmed by sequencing.

    Area of Science:

    • Molecular Biology
    • Protein Synthesis
    • Gene Expression

    Background:

    • Protein synthesis initiation factor 4A (eIF-4A) plays a crucial role in regulating translation.
    • Understanding the molecular basis of eIF-4A expression is essential for deciphering gene regulation.

    Purpose of the Study:

    • To isolate and characterize mouse cDNA clones encoding eIF-4A.
    • To investigate the different mRNA species involved in eIF-4A production in mammalian cells.

    Main Methods:

    • Monoclonal antibodies against rabbit reticulocyte eIF-4A were used for clone isolation.
    • cDNA clones were expressed in E. coli and identified via hybrid-selected translation and peptide mapping.
    • Northern hybridization and cDNA sequencing were employed to analyze eIF-4A mRNA.

    Main Results:

    • Mouse cDNA clones expressing eIF-4A sequences were successfully isolated.
    • Two distinct mRNA species for eIF-4A, approximately 2000 and 1600 nucleotides, were detected in mouse liver and HeLa cells.
    • cDNA sequencing confirmed the presence of two mRNAs encoding eIF-4A.

    Conclusions:

    • The study successfully identified mouse cDNA clones for eIF-4A.
    • Evidence suggests the existence of at least two distinct mRNA transcripts for eIF-4A in mammalian cells.
    • These findings contribute to understanding the regulation of protein synthesis at the translational level.

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