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TitlePaenilamicins from the honey bee pathogen are context-specific translocation inhibitors of protein synthesis.
Journal, issue, pagesbioRxiv, Year 2024
Publish dateMay 21, 2024
AuthorsTimm O Koller / Max J Berger / Martino Morici / Helge Paternoga / Timur Bulatov / Adriana Di Stasi / Tam Dang / Andi Mainz / Karoline Raulf / Caillan Crowe-McAuliffe / Marco Scocchi / Mario Mardirossian / Bertrand Beckert / Nora Vázquez-Laslop / Alexander Mankin / Roderich D Süssmuth / Daniel N Wilson /
PubMed AbstractThe paenilamicins are a group of hybrid non-ribosomal peptide-polyketide compounds produced by the honey bee pathogen that display activity against Gram-positive pathogens, such as . While ...The paenilamicins are a group of hybrid non-ribosomal peptide-polyketide compounds produced by the honey bee pathogen that display activity against Gram-positive pathogens, such as . While paenilamicins have been shown to inhibit protein synthesis, their mechanism of action has remained unclear. Here, we have determined structures of the paenilamicin PamB2 stalled ribosomes, revealing a unique binding site on the small 30S subunit located between the A- and P-site tRNAs. In addition to providing a precise description of interactions of PamB2 with the ribosome, the structures also rationalize the resistance mechanisms utilized by . We could further demonstrate that PamB2 interferes with the translocation of mRNA and tRNAs through the ribosome during translation elongation, and that this inhibitory activity is influenced by the presence of modifications at position 37 of the A-site tRNA. Collectively, our study defines the paenilamicins as a new class of context-specific translocation inhibitors.
External linksbioRxiv / PubMed:38826346 / PubMed Central
MethodsEM (single particle)
Resolution2.2 - 2.4 Å
Structure data

EMDB-18950, PDB-8r6c:
70S Escherichia coli ribosome with Paenilamicin B2 bound with A- and P-site tRNA.
Method: EM (single particle) / Resolution: 2.2 Å

EMDB-19004, PDB-8r8m:
70S Escherichia coli ribosome with Paenilamicin B2 bound with hybrid A/P- and hybrid P/E-tRNA.
Method: EM (single particle) / Resolution: 2.4 Å

EMDB-50296, PDB-9fbv:
70S Escherichia coli ribosome with P-site initiatior tRNA.
Method: EM (single particle) / Resolution: 2.4 Å

Chemicals

ChemComp-ZN:
Unknown entry

ChemComp-MG:
Unknown entry

ChemComp-K:
Unknown entry

ChemComp-HOH:
WATER

Source
  • escherichia coli bw25113 (bacteria)
  • Paenibacillus larvae (bacteria)
  • synthetic construct (others)
KeywordsRIBOSOME / 70S / Paenilamicin / Antibiotic / Initiation / fMet

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