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PIASy, a nuclear matrix-associated SUMO E3 ligase, represses LEF1 activity by sequestration into nuclear bodies

The Wnt-responsive transcription factor LEF1 can activate transcription in association with β-catenin and repress transcription in association with Groucho. In search of additional regulatory mechanisms of LEF1 function, we identified the protein inhibitor of activated STAT, PIASy, as a novel intera...

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Main Authors: Sachdev, Shrikesh (Author) , Bruhn, Laurakay (Author) , Sieber, Heidemarie (Author) , Pichler, Andrea (Author) , Melchior, Frauke (Author) , Grosschedl, Rudolf (Author)
Format: Article (Journal)
Language:English
Published: July 1, 2001
In: Genes & development
Year: 2001, Volume: 15, Issue: 23, Pages: 3088-3103
ISSN:1549-5477
DOI:10.1101/gad.944801
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1101/gad.944801
Verlag, kostenfrei, Volltext: http://genesdev.cshlp.org/content/15/23/3088
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Author Notes:Shrikesh Sachdev, Laurakay Bruhn, Heidemarie Sieber, Andrea Pichler, Frauke Melchior, and Rudolf Grosschedl

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520 |a The Wnt-responsive transcription factor LEF1 can activate transcription in association with β-catenin and repress transcription in association with Groucho. In search of additional regulatory mechanisms of LEF1 function, we identified the protein inhibitor of activated STAT, PIASy, as a novel interaction partner of LEF1. Coexpression of PIASy with LEF1 results in potent repression of LEF1 activity and in covalent modification of LEF1 with SUMO. PIASy markedly stimulates the sumoylation of LEF1 and multiple other proteins in vivo and functions as a SUMO E3 ligase for LEF1 in a reconstituted system in vitro. Moreover, PIASy binds to nuclear matrix-associated DNA sequences and targets LEF1 to nuclear bodies, suggesting that PIASy-mediated subnuclear sequestration accounts for the repression of LEF1 activity. 
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