Transcriptional activity of signal-dependent transcription factors, including nuclear receptors, relies on interacting co-regulator proteins, many of which possess protein-modifying activity. SUMOs (small ubiquitin-related modifiers) and their conjugation pathway components act as co-regulator proteins for numerous transcription factors that also are often targets for SUMO modification. PIAS [protein inhibitor of activated STAT (signal transducer and activator of transcription)] proteins promote SUMOylation in a manner that resembles the action of RING-type ubiquitin E3 ligases. PIAS proteins were initially named for their ability to interact with STAT proteins and inhibit their activity, but their interactions and functions are not restricted to the STATs. Moreover, PIAS proteins do not operate merely as SUMO E3s, since their co-regulator effects are often independent of their RING finger but dependent on their SIM (SUMO-interacting motif) or SAP (scaffold attachment factor-A/B/acinus/PIAS) domain capable of interacting with DNA. The modulator activity imparted by the PIAS/SUMO system involves altered subnuclear targeting and/or assembly of transcription complexes. PIAS proteins may act as platforms that facilitate both removal and recruitment of other regulatory proteins in the transcription complexes.
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December 2007
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November 23 2007
PIAS proteins as regulators of small ubiquitin-related modifier (SUMO) modifications and transcription Available to Purchase
J.J. Palvimo
J.J. Palvimo
1
1Institute of Biomedicine/Medical Biochemistry, University of Kuopio, P.O. Box 1627, FI-70211 Kuopio, Finland
1email [email protected]
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Publisher: Portland Press Ltd
Received:
May 22 2007
Online ISSN: 1470-8752
Print ISSN: 0300-5127
© The Authors Journal compilation © 2007 Biochemical Society
2007
Biochem Soc Trans (2007) 35 (6): 1405–1408.
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Received:
May 22 2007
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J.J. Palvimo; PIAS proteins as regulators of small ubiquitin-related modifier (SUMO) modifications and transcription. Biochem Soc Trans 1 December 2007; 35 (6): 1405–1408. doi: https://doi.org/10.1042/BST0351405
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