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Sequential domain assembly of ribosomal protein S3 drives 40S subunit maturation

  • Mitterer, Valentin Institut fu¨r Molekulare Biowissenschaften, Universität Graz, Austria
  • Murat, Guillaume Unit of Biochemistry, Department of Biology, University of Fribourg, Switzerland
  • Réty, Stéphane Laboratoire de Cristallographie et RMN Biologiques, UMR CNRS 8015, Université Paris Descartes, France
  • Blaud, Magali Laboratoire de Cristallographie et RMN Biologiques, UMR CNRS 8015, Université Paris Descartes, France
  • Delbos, Lila Laboratoire de Cristallographie et RMN Biologiques, UMR CNRS 8015, Université Paris Descartes, France
  • Stanborough, Tamsyn Institut fu¨r Molekulare Biowissenschaften, Universität Graz, Austria
  • Bergler, Helmut Institut fu¨r Molekulare Biowissenschaften, Universität Graz, Austria
  • Leulliot, Nicolas Laboratoire de Cristallographie et RMN Biologiques, UMR CNRS 8015, Université Paris Descartes, France
  • Kressler, Dieter Unit of Biochemistry, Department of Biology, University of Fribourg, Switzerland
  • Pertschy, Brigitte Institut fu¨r Molekulare Biowissenschaften, Universität Graz, Austria
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    02.02.2016
Published in:
  • Nature Communications. - 2016, vol. 7, p. 10336
English Eukaryotic ribosomes assemble by association of ribosomal RNA with ribosomal proteins into nuclear precursor particles, which undergo a complex maturation pathway coordinated by non-ribosomal assembly factors. Here, we provide functional insights into how successive structural re-arrangements in ribosomal protein S3 promote maturation of the 40S ribosomal subunit. We show that S3 dimerizes and is imported into the nucleus with its N-domain in a rotated conformation and associated with the chaperone Yar1. Initial assembly of S3 with 40S precursors occurs via its C- domain, while the N-domain protrudes from the 40S surface. Yar1 is replaced by the assembly factor Ltv1, thereby fixing the S3 N-domain in the rotated orientation and preventing its 40S association. Finally, Ltv1 release, triggered by phosphorylation, and flipping of the S3 N-domain into its final position results in the stable integration of S3. Such a stepwise assembly may represent a new paradigm for the incorporation of ribosomal proteins.
Faculty
Faculté des sciences et de médecine
Department
Département de Biologie
Language
  • English
Classification
Biology
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/304783
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