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Dipeptide formation with misacylated tRNAPhes.

T G Heckler, Y Zama, T Naka

    The Journal of Biological Chemistry
    |April 10, 1983
    PubMed
    Summary
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    Researchers created misacylated transfer RNAs (tRNAs) to study protein synthesis. Chemically modified tRNAs, like N-acetyl-L-phenylalanyl-tRNAPhe, participated effectively in the peptidyltransferase reaction on ribosomes.

    Area of Science:

    • Molecular Biology
    • Biochemistry
    • Genetics

    Background:

    • Transfer RNA (tRNA) plays a crucial role in protein synthesis by carrying amino acids to the ribosome.
    • The precise aminoacylation of tRNA is essential for accurate translation of genetic information.
    • Misacylated tRNAs, where an incorrect amino acid is attached, can provide insights into translation fidelity.

    Purpose of the Study:

    • To synthesize misacylated P-site tRNAs using T4 RNA ligase.
    • To investigate the participation of these chemically modified tRNAs in the peptidyltransferase reaction.
    • To compare the efficiency of misacylated tRNAs with enzymatically prepared ones in dipeptide formation.

    Main Methods:

    • Preparation of misacylated Escherichia coli tRNAPhe by ligating tRNA lacking terminal bases with N-acetylaminoacyl-pCpA derivatives.

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  • Purification of modified tRNAs using DEAE-cellulose and benzoylated DEAE-cellulose chromatography.
  • Assay of misacylated tRNAs in the peptidyltransferase reaction using E. coli ribosomes and poly(U) messenger RNA.

    • Main Results:

    • Chemically prepared N-acetyl-L-phenylalanyl-tRNAPhe showed high dipeptide formation, comparable to enzymatically prepared authentic N-acetyl-L-phenylalanyl-tRNAPhe.
    • N-acetyl-L-tyrosyl-tRNAPhe also facilitated significant dipeptide formation.
    • D-isomers of N-acetylaminoacyl-tRNAs were less efficient in dipeptide synthesis, and N-acetyl-beta-phenylalanyl-tRNAPhe was as effective as the L-isomer.

    Conclusions:

    • Chemically synthesized misacylated tRNAs can effectively participate in ribosomal peptidyltransferase reactions.
    • The stereochemistry of the amino acid influences tRNA participation in peptide bond formation.
    • This study provides a method for creating and studying misacylated tRNAs to understand translation mechanisms.