Ribosome Biogenesis in Eukaryotes

Anthony Henras

Yves Henry

Chargé de Recherche, CNRS
05 61 33 59 55
Directeur de Recherche, CNRS
05 61 33 59 53

Team members

  Researcher
  • Odile Humbert
  Professor
  • Yves Romeo
  Technical staff
  • Kamila Belhabich-Baumas
  • Régine Capeyrou
  PhD
  • Emilie Cerezo
  • Mariam Jaafar
  • Ali Khreiss

Presentation

Ribosome production in eukaryotes is initiated by the transcription by RNA polymerase I of a pre-ribosomal RNA (pre-rRNA), precursor to the 18S, 5.8S and 25S/28S ribosomal RNAs (rRNAs). This pre-rRNA associates co-transcriptionally with ribosomal proteins, small nucleolar ribonucleoprotein particles (snoRNPs) and non-ribosomal proteins to yield a nascent pre-ribosomal particle from which the early pre-40S particle containing the 18S rRNA sequence is split mostly co-transcriptionally. The early pre-60S particle assembled onto the 5.8S and 25S sequences is released subsequently following transcription termination. These particles then follow independent maturation pathways, first in the nucleus and finally in the cytoplasm. Within this series of pre-ribosomal particles, the pre-rRNAs are chemically modified and progressively processed by endo- and exoribonucleases to release the mature rRNAs. Hundreds of snoRNPs and more than 200 non-ribosomal proteins are involved in ribosome synthesis in eukaryotes. The molecular functions of most of these co-factors, several of which are enzymes, remain elusive. Our aims are to understand the precise molecular functions and modes of regulation of several key non-ribosomal factors involved in the co- and/or post-transcriptional steps of ribosome synthesis, in particular energy-consuming enzymes.

Projets

Function of the atypical RIO kinases in late stages of the maturation of pre-40S particles in yeast and human cells

Function of the Dbp6p/Npa1p/Npa2p/Nop8p/Rsa3p complex in the maturation of early pre-60S particles in yeast

Regulation of the Prp43p helicase by its G-patch domain-containing co-factors Gno1p/PINX1 and Pfa1p in yeast and human

Function of Rpf2p and Rrs1p in the coordination between synthesis and maturation of the pre-ribosomal RNA in yeast and human

Publications

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Funding

   

Université Paul Sabatier
118 Route de Narbonne

31062 TOULOUSE Cedex
France

Annuaire général