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Cited by 547

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

Open access
Sachdev, Shrikesh, Bruhn, Laurakay, Sieber, Heidemarie, Pichler, Andrea, Melchior, Frauke, Grosschedl, Rudolf·2001·Genes & Development

Abstract

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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Metadata

Authors
Sachdev, S., Bruhn, L., Sieber, H., Pichler, A., Melchior, F., & Grosschedl, R.
Venue
Genes & Development
Published
2001-12-01
Volume
15
Issue
23
Pages
3088-3103
ISSN
  • 0890-9369 (ISSN-L)
  • 1549-5477
OpenAlex
W2118810511
Cited by
547
References
3
Type
posted content
Language
en
Open access
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Sachdev, S., Bruhn, L., Sieber, H., Pichler, A., Melchior, F., & Grosschedl, R. (2001). PIASy, a nuclear matrix–associated SUMO E3 ligase, represses LEF1 activity by sequestration into nuclear bodies. Genes & Development. https://doi.org/10.1101/gad.944801

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