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Title | The cyclic octapeptide antibiotic argyrin B inhibits translation by trapping EF-G on the ribosome during translocation. |
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Journal, issue, pages | Proc Natl Acad Sci U S A, Vol. 119, Issue 19, Page e2114214119, Year 2022 |
Publish date | May 10, 2022 |
![]() | Maximiliane Wieland / Mikael Holm / Emily J Rundlet / Martino Morici / Timm O Koller / Tinashe P Maviza / Domen Pogorevc / Ilya A Osterman / Rolf Müller / Scott C Blanchard / Daniel N Wilson / ![]() ![]() ![]() |
PubMed Abstract | Argyrins are a family of naturally produced octapeptides that display promising antimicrobial activity against Pseudomonas aeruginosa. Argyrin B (ArgB) has been shown to interact with an elongated ...Argyrins are a family of naturally produced octapeptides that display promising antimicrobial activity against Pseudomonas aeruginosa. Argyrin B (ArgB) has been shown to interact with an elongated form of the translation elongation factor G (EF-G), leading to the suggestion that argyrins inhibit protein synthesis by interfering with EF-G binding to the ribosome. Here, using a combination of cryo-electron microscopy (cryo-EM) and single-molecule fluorescence resonance energy transfer (smFRET), we demonstrate that rather than interfering with ribosome binding, ArgB rapidly and specifically binds EF-G on the ribosome to inhibit intermediate steps of the translocation mechanism. Our data support that ArgB inhibits conformational changes within EF-G after GTP hydrolysis required for translocation and factor dissociation, analogous to the mechanism of fusidic acid, a chemically distinct antibiotic that binds a different region of EF-G. These findings shed light on the mechanism of action of the argyrin-class antibiotics on protein synthesis as well as the nature and importance of rate-limiting, intramolecular conformational events within the EF-G-bound ribosome during late-steps of translocation. |
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Methods | EM (single particle) |
Resolution | 2.58 - 2.9 Å |
Structure data | EMDB-13058, PDB-7otc: EMDB-26486, PDB-7ug7: |
Chemicals | ![]() ChemComp-MG: ![]() ChemComp-ATP: ![]() ChemComp-PUT: ![]() ChemComp-SPD: ![]() ChemComp-ZN: ![]() ChemComp-GDP: ![]() ChemComp-1I7: ![]() ChemComp-FME: ![]() ChemComp-PHE: |
Source |
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![]() | RIBOSOME / antibiotic / translation / Translocation / EF-G / Argyrin |