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2017-03-13 - Article/Dans un journal avec peer-review - Anglais - 15 page(s)

Deschamps Thibaut, Bazot Quentin, Leske Derek M, MacLeod Ruth, Mompelat Dimitri, Tafforeau Lionel , Lotteau Vincent, Maréchal Vincent, Baillie Georges S, Gruffat Henri, Wilson Joanna B, Manet Evelyne, "Epstein-Barr Virus Nuclear Antigen 1 interacts with Regulator of Chromosome Condensation 1 dynamically throughout the cell cycle." in Journal of General Virology (The), 98, 2, 251-265, 10.1099/jgv.0.000681

  • Edition : Society for General Microbiology, London (United Kingdom)
  • Codes CREF : Virologie générale (DI3132), Biologie moléculaire (DI3111), Biologie (DI3100)
  • Unités de recherche UMONS : Biologie cellulaire (S815)
  • Instituts UMONS : Institut des Sciences et Technologies de la Santé (Santé), Institut des Biosciences (Biosciences)
Texte intégral :

Abstract(s) :

(Anglais) The Epstein-Barr virus (EBV) nuclear antigen 1 (EBNA1) is a sequence-specific DNA binding protein which plays an essential role in viral episome replication and segregation, by recruiting the cellular complex of DNA replication onto the origin (oriP) and by tethering the viral DNA onto the mitotic chromosomes. Whereas the mechanisms of viral DNA replication are well documented, those involved in tethering EBNA1 to the cellular chromatin are far from being understood. Here, we have identified Regulator of Chromosome Condensation 1 (RCC1) as a novel cellular partner for EBNA1. RCC1 is the major nuclear guanine nucleotide exchange factor (RanGEF) for the small GTPase Ran enzyme. RCC1, associated with chromatin, is involved in the formation of RanGTP gradients critical for nucleo-cytoplasmic transport, mitotic spindle formation, and nuclear envelope reassembly following mitosis. Using several approaches, we have demonstrated a direct interaction between these two proteins and found that the EBNA1 domains responsible for EBNA1 tethering to the mitotic chromosomes are also involved in the interaction with RCC1. The use of an EBNA1 peptide array confirmed the interaction of RCC1 with these regions and also the importance of the N-terminal region of RCC1 in this interaction. Finally, using confocal microscopy and FRET analysis to follow the dynamics of interaction between the two proteins throughout the cell cycle, we have demonstrated that EBNA1 and RCC1 closely associate on the chromosomes during metaphase, suggesting an essential role for the interaction during this phase, perhaps in tethering EBNA1 to mitotic chromosomes.