Localization of proteins bound to a replication origin of human DNA along the cell cycle

Gulnara Abdurashidova, Miltcho B. Danailov, Alexander Ochem, Gianluca Triolo, Vera Djeliova, Sorina Radulescu, Alessandro Vindigni, Silvano Riva, Arturo Falaschi

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65 Scopus citations


The proteins bound in vivo at the human lamin B2 DNA replication origin and their precise sites of binding were investigated along the cell cycle utilizing two novel procedures based on immunoprecipitation following UV irradiation with a pulsed laser light source. In G1, the pre-replicative complex contains CDC6, MCM3, ORC1 and ORC2 proteins; of these, the post-replicative complex in S phase contains only ORC2; in M phase none of them are bound. The precise nucleotide of binding was identified for the two ORC and the CDC6 proteins near the start sites for leading-strand synthesis; the transition from the pre- to the post-replicative complex is accompanied by a 17 bp displacement of the ORC2 protein towards the start site.

Original languageEnglish
Pages (from-to)4294-4303
Number of pages10
JournalEMBO Journal
Issue number16
StatePublished - Aug 15 2003


  • Lamin B2 origin
  • ORC proteins
  • Origin of replication
  • UV cross-linking


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