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Cotranslational Folding of a Pentarepeat beta-Helix Protein
Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.ORCID iD: 0000-0003-4777-3417
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Number of Authors: 52018 (English)In: Journal of Molecular Biology, ISSN 0022-2836, E-ISSN 1089-8638, Vol. 430, no 24, p. 5196-5206Article in journal (Refereed) Published
Abstract [en]

It is becoming increasingly clear that many proteins start to fold cotranslationally before the entire polypeptide chain has been synthesized on the ribosome. One class of proteins that a priori would seem particularly prone to cotranslational folding is repeat proteins, that is, proteins that are built from an array of nearly identical sequence repeats. However, while the folding of repeat proteins has been studied extensively in vitro with purified proteins, only a handful of studies have addressed the issue of cotranslational folding of repeat proteins. Here, we have determined the structure and studied the cotranslational folding of a beta-helix pentarepeat protein from the human pathogen Clostridium botulinum a homolog of the fluoroquinolone resistance protein MfpA-using an assay in which the SecM translational arrest peptide serves as a force sensor to detect folding events. We find that cotranslational folding of a segment corresponding to the first four of the eight beta-helix coils in the protein produces enough force to release ribosome stalling and that folding starts when this unit is similar to 35 residues away from the P-site, near the distal end of the ribosome exit tunnel. An additional folding transition is seen when the whole PENT moiety emerges from the exit tunnel. The early cotranslational formation of a folded unit may be important to avoid misfolding events in vivo and may reflect the minimal size of a stable beta-helix since it is structurally homologous to the smallest known beta-helix protein, a four-coil protein that is stable in solution.

Place, publisher, year, edition, pages
2018. Vol. 430, no 24, p. 5196-5206
Keywords [en]
pentapeptide-repeat protein, beta-helix, cotranslational folding, X-ray structure, Clostridium botulinum
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:su:diva-165808DOI: 10.1016/j.jmb.2018.10.016ISI: 000454377100026PubMedID: 30539762OAI: oai:DiVA.org:su-165808DiVA, id: diva2:1287537
Available from: 2019-02-11 Created: 2019-02-11 Last updated: 2019-02-11Bibliographically approved

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Martínez-Carranza, MarkelFarías-Rico, José ArcadioStenmark, Pålvon Heijne, Gunnar
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