The centromeric protein Sgo1 is required to sense lack of tension on mitotic chromosomes

Science. 2005 Jan 7;307(5706):130-3. doi: 10.1126/science.1101366.

Abstract

Chromosome alignment on the mitotic spindle is monitored by the spindle checkpoint. We identify Sgo1, a protein involved in meiotic chromosome cohesion, as a spindle checkpoint component. Budding yeast cells with mutations in SGO1 respond normally to microtubule depolymerization but not to lack of tension at the kinetochore, and they have difficulty attaching sister chromatids to opposite poles of the spindle. Sgo1 is thus required for sensing tension between sister chromatids during mitosis, and its degradation when they separate may prevent cell cycle arrest and chromosome loss in anaphase, a time when sister chromatids are no longer under tension.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Anaphase
  • Anaphase-Promoting Complex-Cyclosome
  • Cell Cycle
  • Cell Cycle Proteins / metabolism
  • Chromatids / physiology
  • Chromosomal Proteins, Non-Histone
  • Chromosome Segregation
  • Chromosomes, Fungal / physiology*
  • Kinetochores / physiology
  • Mitosis*
  • Mutation
  • Nuclear Proteins / genetics
  • Nuclear Proteins / metabolism
  • Nuclear Proteins / physiology*
  • Phosphoproteins / metabolism
  • Protein Serine-Threonine Kinases / metabolism
  • Protein-Tyrosine Kinases / metabolism
  • Saccharomyces cerevisiae / genetics
  • Saccharomyces cerevisiae / physiology*
  • Saccharomyces cerevisiae Proteins / genetics
  • Saccharomyces cerevisiae Proteins / metabolism
  • Saccharomyces cerevisiae Proteins / physiology*
  • Spindle Apparatus / physiology*
  • Ubiquitin-Protein Ligase Complexes / metabolism

Substances

  • Cell Cycle Proteins
  • Chromosomal Proteins, Non-Histone
  • MCD1 protein, S cerevisiae
  • Nuclear Proteins
  • Phosphoproteins
  • Saccharomyces cerevisiae Proteins
  • Sgo1 protein, S cerevisiae
  • Ubiquitin-Protein Ligase Complexes
  • Anaphase-Promoting Complex-Cyclosome
  • Protein-Tyrosine Kinases
  • Protein Serine-Threonine Kinases
  • MPS1 protein, S cerevisiae