Human DNA helicase B interacts with the replication initiation protein Cdc45 and facilitates Cdc45 binding onto chromatin Academic Article uri icon


MeSH Major

  • Cell Cycle Proteins
  • Chromatin
  • DNA Helicases


  • The chromosomal DNA replication in eukaryotic cells begins at replication initation sites, which are marked by the assembly of the pre-replication complexes in early G1. At the G1/S transition, recruitment of additional replication initiation proteins enables origin DNA unwinding and loading of DNA polymerases. We found that depletion of the human DNA helicase B (HDHB) inhibits the initiation of DNA replication, suggesting a role of HDHB in the beginning of the DNA synthesis. To gain insight into the function of HDHB during replication initiation, we examined the physical interactions of purified recombinant HDHB with key initiation proteins. HDHB interacts directly with two initiation factors TopBP1 and Cdc45. In addition we found that both, the N-terminus and helicase domain of HDHB bind to the N-terminus of Cdc45. Furthermore depletion of HDHB from human cells diminishes Cdc45 association with chromatin, suggesting that HDHB may facilitate Cdc45 recruitment at G1/S in human cells.

publication date

  • January 2015



  • Academic Article



  • eng

PubMed Central ID

  • PMC4439256

Digital Object Identifier (DOI)

  • 10.1016/j.yexcr.2015.04.014

PubMed ID

  • 25933514

Additional Document Info

start page

  • 283

end page

  • 93


  • 334


  • 2