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Isolation of Translating Ribosomes Containing Peptidyl-tRNAs for Functional and Structural Analyses
11:19

Isolation of Translating Ribosomes Containing Peptidyl-tRNAs for Functional and Structural Analyses

Published on: February 25, 2011

Interplay between the ribosomal tunnel, nascent chain, and macrolides influences drug inhibition

Agata L Starosta1, Viktoriya V Karpenko, Anna V Shishkina

  • 1Gene Center and Department of Biochemistry, University of Munich, LMU, Munich D-81377, Germany.

Chemistry & Biology
|June 11, 2010
PubMed

Insights

Macrolide antibiotics interact with ribosomal tunnels, and their inhibition of protein synthesis is specific to the polypeptide chain being translated. This finding changes our understanding of how these drugs work.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Drug Discovery

Background:

  • Nascent polypeptide chains interact with the ribosomal exit tunnel during translation.
  • Macrolide antibiotics bind to the ribosomal exit tunnel, inhibiting protein synthesis and causing peptidyl-tRNA drop-off.

Purpose of the Study:

  • To investigate the interaction of amino acid- and peptide-containing macrolides with the ribosomal exit tunnel.
  • To determine if distinct amino acids and peptides enhance macrolide binding and inhibition.
  • To explore the polypeptide specificity of macrolide antibiotic inhibition.

Main Methods:

  • Synthesis of novel amino acid- and peptide-containing macrolides.
  • Assays to measure ribosome binding and translation inhibition.
  • Analysis of macrolide effects on different nascent polypeptide chains.

Main Results:

  • Synthesized macrolides demonstrated enhanced ribosome binding and inhibitory properties.
  • Distinct amino acids and peptides were shown to interact with ribosomal tunnel components.
  • Macrolide antibiotics exhibited polypeptide-specific inhibition of translation.

Conclusions:

  • The ribosomal exit tunnel is not a non-specific channel but interacts with nascent chains.
  • Macrolide antibiotic inhibition is dependent on the specific polypeptide sequence.
  • This study provides a revised mechanistic understanding of macrolide antibiotic action.

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