Components and dynamics of DNA replication complexes in S. cerevisiae: redistribution of MCM proteins and Cdc45p during S phase

Cell. 1997 Oct 3;91(1):59-69. doi: 10.1016/s0092-8674(01)80009-x.


In S. cerevisiae, the chromatin structure of DNA replication origins changes as cells become competent for DNA replication, suggesting that G1 phase-specific association of replication factors with origin DNA regulates entry into S phase. We demonstrate that ORC, Cdc45p, and MCM proteins are components of prereplication complexes (pre-RC). The MCM-origin association is dependent upon ORC and Cdc6p. During S phase, MCM proteins and Cdc45p dissociate from origin DNA and associate with nonorigin DNA with similar kinetics as DNA Polymerase epsilon, which is present at DNA replication forks. Our results identify protein components of the pre-RC and a novel replication complex appearing at the G1/S transition (the RC), and suggest that after initiation MCM proteins and Cdc45p move with eukaryotic replication forks.

Publication types

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

MeSH terms

  • Carrier Proteins / metabolism*
  • Cell Cycle / genetics
  • Cell Cycle Proteins / metabolism
  • DNA Replication / physiology*
  • DNA, Fungal / biosynthesis
  • DNA, Fungal / metabolism*
  • DNA-Binding Proteins / metabolism*
  • Enzyme Inhibitors / pharmacology
  • Fungal Proteins / metabolism*
  • Hydroxyurea / pharmacology
  • Minichromosome Maintenance Complex Component 7
  • Models, Genetic
  • Nuclear Proteins / metabolism*
  • Origin Recognition Complex
  • Replication Origin / genetics
  • Ribonucleotide Reductases / pharmacology
  • S Phase / genetics
  • Saccharomyces cerevisiae / genetics*
  • Saccharomyces cerevisiae Proteins*


  • CDC45 protein, S cerevisiae
  • CDC6 protein, S cerevisiae
  • Carrier Proteins
  • Cell Cycle Proteins
  • DNA, Fungal
  • DNA-Binding Proteins
  • Enzyme Inhibitors
  • Fungal Proteins
  • Nuclear Proteins
  • Origin Recognition Complex
  • Saccharomyces cerevisiae Proteins
  • Ribonucleotide Reductases
  • MCM7 protein, S cerevisiae
  • Minichromosome Maintenance Complex Component 7
  • Hydroxyurea