Evidence that the MIF2 gene of Saccharomyces cerevisiae encodes a centromere protein with homology to the mammalian centromere protein CENP-C

Mol Biol Cell. 1995 Jul;6(7):793-807. doi: 10.1091/mbc.6.7.793.

Abstract

The MIF2 gene of Saccharomyces cerevisiae has been implicated in mitosis. Here we provide genetic evidence that MIF2 encodes a centromere protein. Specifically, we found that mutations in MIF2 stabilize dicentric minichromosomes and confer high instability (i.e., a synthetic acentric phenotype) to chromosomes that bear a cis-acting mutation in element I of the yeast centromeric DNA (CDEI). Similarly, we observed synthetic phenotypes between mutations in MIF2 and trans-acting mutations in three known yeast centromere protein genes-CEP1/CBF1/CPF1, NDC10/CBF2, and CEP3/CBF3B. In addition, the mif2 temperature-sensitive phenotype can be partially rescued by increased dosage of CEP1. Synthetic lethal interactions between a cep1 null mutation and mutations in either NDC10 or CEP3 were also detected. Taken together, these data suggest that the Mif2 protein interacts with Cep1p at the centromere and that the yeast centromere indeed exists as a higher order protein-DNA complex. The Mif2 and Cep1 proteins contain motifs of known transcription factors, suggesting that assembly of the yeast centromere is analogous to that of eukaryotic enhancers and origins of replication. We also show that the predicted Mif2 protein shares two short regions of homology with the mammalian centromere Ag CENP-C and that two temperature-sensitive mutations in MIF2 lie within these regions. These results provide evidence for structural conservation between yeast and mammalian centromeres.

Publication types

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

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Basic Helix-Loop-Helix Leucine Zipper Transcription Factors
  • Centromere / chemistry*
  • Chromosomal Proteins, Non-Histone / chemistry
  • Chromosomal Proteins, Non-Histone / genetics*
  • Chromosomes, Fungal
  • DNA, Fungal / genetics
  • DNA-Binding Proteins / chemistry
  • DNA-Binding Proteins / genetics
  • Fungal Proteins / chemistry
  • Fungal Proteins / genetics*
  • Fungal Proteins / metabolism
  • Genes, Fungal / genetics
  • Genes, Suppressor / genetics
  • Humans
  • Kinetochores
  • Mice
  • Molecular Sequence Data
  • Mutation
  • Nuclear Proteins / genetics
  • Saccharomyces cerevisiae / chemistry
  • Saccharomyces cerevisiae / genetics*
  • Saccharomyces cerevisiae Proteins*
  • Sequence Homology, Amino Acid
  • Temperature

Substances

  • Basic Helix-Loop-Helix Leucine Zipper Transcription Factors
  • CBF1 protein, S cerevisiae
  • CBF2 protein, S cerevisiae
  • CEP3 protein, S cerevisiae
  • Chromosomal Proteins, Non-Histone
  • DNA, Fungal
  • DNA-Binding Proteins
  • Fungal Proteins
  • MIF2 protein, S cerevisiae
  • Nuclear Proteins
  • Saccharomyces cerevisiae Proteins
  • centromere protein C

Associated data

  • GENBANK/U03113
  • GENBANK/Z18294