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Polynucleotide . ribosomal-protein complexes and their decoding properties

T Sarapuu, R Villems

    European Journal of Biochemistry
    |May 17, 1982
    PubMed
    Summary

    Escherichia coli ribosomal proteins bind various RNA types, forming complexes that can bind and select specific transfer RNAs (tRNAs). This suggests these proteins are involved in messenger RNA (mRNA) decoding within the ribosome.

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    Area of Science:

    • Molecular Biology
    • Ribosome Function
    • RNA-Protein Interactions

    Background:

    • Ribosomes are essential molecular machines responsible for protein synthesis.
    • Understanding the specific roles of ribosomal proteins in RNA binding and function is crucial for deciphering gene expression mechanisms.

    Purpose of the Study:

    • To investigate the binding interactions between Escherichia coli ribosomal proteins and different types of RNA.
    • To determine if these RNA-protein complexes exhibit functional properties related to transfer RNA (tRNA) binding and selection.
    • To identify potential functional domains within the ribosome involved in messenger RNA (mRNA) decoding.

    Main Methods:

    • Immobilization of various polynucleotides (polyadenylic acid, polycytidylic acid, polyuridylic acid, and phage MS2 RNA) on Sepharose beads.

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  • Affinity chromatography to isolate and identify ribosomal proteins that bind to the immobilized RNA.
  • Assays to test the binding of transfer RNAs (tRNAs) to the formed polynucleotide-protein complexes.
  • Characterization of the specificity of tRNA selection by specific polynucleotide-protein complexes.

    • Main Results:

    • A conserved set of eight Escherichia coli ribosomal proteins (S1, S3, S4, S5, S9, S13, L2, and L17) consistently bind to all tested polynucleotides, irrespective of their nucleotide composition.
    • The formed polynucleotide-protein complexes demonstrate the ability to bind transfer RNAs (tRNAs).
    • Poly(A)-protein and poly(U)-protein complexes exhibit efficient selection of their cognate tRNAs, specifically tRNALys and tRNAPhe, respectively.

    Conclusions:

    • The identified set of ribosomal proteins forms stable complexes with various RNA molecules.
    • These RNA-binding ribosomal proteins possess the functional capability to bind and discriminate between different transfer RNAs (tRNAs).
    • The findings strongly suggest that these ribosomal proteins constitute a functional domain within the ribosome dedicated to the critical process of messenger RNA (mRNA) decoding.