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Ytm1, Nop7, and Erb1 form a complex necessary for maturation of yeast 66S preribosomes.

The essential, conserved yeast nucleolar protein Ytm1 is one of 17 proteins in ribosome assembly intermediates that contain WD40 protein-protein interaction motifs. Such proteins may play key roles in organizing other molecules necessary for ribosome biogenesis. Ytm1 is present in four consecutive 66S preribosomes containing 27SA2, 27SA3, 27SB, and 25.5S plus 7S pre-rRNAs plus ribosome assembly factors and ribosomal proteins. Ytm1 binds directly to Erb1 and is present in a heterotrimeric subcomplex together with Erb1 and Nop7, both within preribosomes and independently of preribosomes. However, Nop7 and Erb1 assemble into preribosomes prior to Ytm1. Mutations in the WD40 motifs of Ytm1 disrupt binding to Erb1, destabilize the heterotrimer, and delay pre-rRNA processing and nuclear export of preribosomes. Nevertheless, 66S preribosomes lacking Ytm1 remain otherwise intact.

Pubmed ID: 16287855


  • Miles TD
  • Jakovljevic J
  • Horsey EW
  • Harnpicharnchai P
  • Tang L
  • Woolford JL


Molecular and cellular biology

Publication Data

December 18, 2005

Associated Grants

  • Agency: NIGMS NIH HHS, Id: F31 GM19937
  • Agency: NIGMS NIH HHS, Id: F31 GM65067
  • Agency: NIGMS NIH HHS, Id: R01 GM28301

Mesh Terms

  • Amino Acid Sequence
  • Cell Nucleus
  • Gene Deletion
  • Microtubule-Associated Proteins
  • Models, Molecular
  • Molecular Sequence Data
  • Molecular Weight
  • Mutation
  • Nuclear Proteins
  • Protein Binding
  • Protein Structure, Quaternary
  • RNA Precursors
  • RNA Processing, Post-Transcriptional
  • RNA, Ribosomal
  • Ribosomal Proteins
  • Ribosomes
  • Saccharomyces cerevisiae
  • Saccharomyces cerevisiae Proteins