Journal
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Volume 387, Issue 3, Pages 494-499Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2009.07.053
Keywords
FLASH; CASP8AP2; Ubc9; SUMO-1; SENP1; Transcription
Categories
Funding
- Norwegian Research Council (OSG)
- Norwegian Cancer Society
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FLASH is a huge multifunctional nuclear protein that has been linked to apoptotic signalling, transcriptional control and Cajal body function. To gain further insight into the functions of the FLASH protein, we performed a yeast two-hybrid screening with FLASH as bait and identified the SUMO-conjugating enzyme Ubc9 as an interaction partner. The main interaction Surface for Ubc9 was found in the C-terminal part of FLASH, which is also a target for sumoylation. We identified K1813 as the major sumoylation site in FLASH, being enhanced by the SUMO E3 ligases Pc2 and PIASy. Disruption of this SUMO-conjugation site did not change the speckled subnuclear localization of FLASH, but it caused a reduction in FLASH activity as measured in a Gal4-tethering assay. Interestingly, the SUMO-specific protease SENP1 activated FLASH in the same assay. Overall, our results point to a complex involvement of sumoylation ill Modulating the function of FLASH. (C) 2009 Elsevier Inc. All rights reserved
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