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The Journal of biological chemistry v.292 no.7, 2017년, pp.2893 - 2902   SCI SCIE
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UbE2E1/UBCH6 Is a Critical in Vivo E2 for the PRC1-catalyzed Ubiquitination of H2A at Lys-119

Wheaton, Keith (From the Department of Biology, York University, Toronto, Ontario M3J1P3 and ) ; Sarkari, Feroz (From the Department of Biology, York University, Toronto, Ontario M3J1P3 and ) ; Stanly Johns, Beena (From the Department of Biology, York University, Toronto, Ontario M3J1P3 and ) ; Davarinejad, Hossein (From the Department of Biology, York University, Toronto, Ontario M3J1P3 and ) ; Egorova, Olga (From the Department of Biology, York University, Toronto, Ontario M3J1P3 and ) ; Kaustov, Lilia (the Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario M5G 1L7, Canada ) ; Raught, Brian (the Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario M5G 1L7, Canada ) ; Saridakis, Vivian (From the Department of Biology, York University, Toronto, Ontario M3J1P3 and ) ; Sheng, Yi (From the Department of Biology, York University, Toronto, Ontario M3J1P3 and ) ;
  • 초록  

    UbE2E1/UbcH6 is an E2 ubiquitin-conjugating enzyme that is regulated by USP7. We identified UbE2E1 as a novel component of Polycomb repressive complex 1 (PRC1), the E3 ligase complex responsible for histone H2A ubiquitination and gene silencing. We demonstrate that UbE2E1 is critical for the monoubiquitination of H2A at residue Lys-119 (uH2AK119) through its association with the PRC1 complex. UbE2E1 interacts with PRC1 subunits including Ring1A and Ring1B. Overexpression of UbE2E1 results in increased levels of uH2AK119, whereas overexpression of catalytically inactive UbE2E1_C131A or UbE2E1 knockdown results in decreased levels of uH2AK119. The down-regulation of H2A ubiquitination by loss of function of UbE2E1 is correlated with alleviated p16 INK4a promoter repression and induced growth inhibition in HCT116 cells. These results are specific to UbE2E1 as knockdown of UbE2D E2s does not show any effect on uH2AK119. We extended the UbE2E1 regulation of uH2AK119 to USP7 and showed that USP7 is also a key regulator for monoubiquitination at H2A Lys-119 as both knockdown and deletion of USP7 results in decreased levels of uH2AK119. This study reveals that UbE2E1 is an in vivo E2 for the PRC1 ligase complex and thus plays an important role in the regulation of H2A Lys-119 monoubiquitination.


  • 주제어

    deubiquitylation (deubiquitination) .   gene silencing .   histone modification .   ubiquitin-conjugating enzyme (E2 enzyme) .   ubiquitylation (ubiquitination) .   uH2AK119 .   h2a ubiquitination .   Polycomb repressive complex.  

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