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TitleStructural Dynamics of the YidC:Ribosome Complex during Membrane Protein Biogenesis.
Journal, issue, pagesCell Rep, Vol. 17, Issue 11, Page 2943-2954, Year 2016
Publish dateDec 13, 2016
AuthorsAlexej Kedrov / Stephan Wickles / Alvaro H Crevenna / Eli O van der Sluis / Robert Buschauer / Otto Berninghausen / Don C Lamb / Roland Beckmann /
PubMed AbstractMembers of the YidC/Oxa1/Alb3 family universally facilitate membrane protein biogenesis, via mechanisms that have thus far remained unclear. Here, we investigated two crucial functional aspects: the ...Members of the YidC/Oxa1/Alb3 family universally facilitate membrane protein biogenesis, via mechanisms that have thus far remained unclear. Here, we investigated two crucial functional aspects: the interaction of YidC with ribosome:nascent chain complexes (RNCs) and the structural dynamics of RNC-bound YidC in nanodiscs. We observed that a fully exposed nascent transmembrane domain (TMD) is required for high-affinity YidC:RNC interactions, while weaker binding may already occur at earlier stages of translation. YidC efficiently catalyzed the membrane insertion of nascent TMDs in both fluid and gel phase membranes. Cryo-electron microscopy and fluorescence analysis revealed a conformational change in YidC upon nascent chain insertion: the essential TMDs 2 and 3 of YidC were tilted, while the amphipathic helix EH1 relocated into the hydrophobic core of the membrane. We suggest that EH1 serves as a mechanical lever, facilitating a coordinated movement of YidC TMDs to trigger the release of nascent chains into the membrane.
External linksCell Rep / PubMed:27974208 / PubMed Central
MethodsEM (single particle)
Resolution4.5 Å
Structure data

4155

5m5h

EMDB-4155: Ribosome-bound membrane insertase YidC
PDB-5m5h: RIBOSOME-BOUND YIDC INSERTASE
Method: EM (single particle) / Resolution: 4.5 Å

Source
  • escherichia coli (E. coli)
KeywordsPROTEIN TRANSPORT / membrane protein / nanodisc / ribosome ligand

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