Ola B Nilsson / Adrian A Nickson / Jeffrey J Hollins / Stephan Wickles / Annette Steward / Roland Beckmann / Gunnar von Heijne / Jane Clarke /
PubMed Abstract
How do the key features of protein folding, elucidated from studies on native, isolated proteins, manifest in cotranslational folding on the ribosome? Using a well-characterized family of homologous ...How do the key features of protein folding, elucidated from studies on native, isolated proteins, manifest in cotranslational folding on the ribosome? Using a well-characterized family of homologous α-helical proteins with a range of biophysical properties, we show that spectrin domains can fold vectorially on the ribosome and may do so via a pathway different from that of the isolated domain. We use cryo-EM to reveal a folded or partially folded structure, formed in the vestibule of the ribosome. Our results reveal that it is not possible to predict which domains will fold within the ribosome on the basis of the folding behavior of isolated domains; instead, we propose that a complex balance of the rate of folding, the rate of translation and the lifetime of folded or partly folded states will determine whether folding occurs cotranslationally on actively translating ribosomes.
EMDB-3451: Folding intermediate of spectrin R16 bound to 70s ribosome PDB-5m6s: folding intermediate of spectrin R16 Method: EM (single particle) / Resolution: 4.8 Å
Source
escherichia coli (E. coli)
Keywords
STRUCTURAL PROTEIN / spectrin / r16
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