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Related Concept Videos

Co-activators and Co-repressors02:04

Co-activators and Co-repressors

Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
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Repressible Operon: trp Operon01:21

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Transcription Attenuation in Prokaryotes02:42

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In Vitro SUMOylation Assay to Study SUMO E3 Ligase Activity
09:45

In Vitro SUMOylation Assay to Study SUMO E3 Ligase Activity

Published on: January 29, 2018

SUMOylation modulates transcriptional repression by TRPS1.

Frank J Kaiser1, Hermann-Josef Lüdecke, Stefan Weger

  • 1Institut für Humangenetik, Universitätsklinikum Essen, D-45122 Essen, Germany. frank.kaiser@uk-sh.de

Biological Chemistry
|March 30, 2007
PubMed
Summary

SUMOylation regulates the TRPS1 gene, which is implicated in tricho-rhino-phalangeal syndromes (TRPS). This posttranslational modification, particularly at the repression domain, is crucial for TRPS1

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Describing a Transcription Factor Dependent Regulation of the MicroRNA Transcriptome
07:23

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Published on: June 15, 2016

Area of Science:

  • Genetics
  • Molecular Biology
  • Biochemistry

Background:

  • Tricho-rhino-phalangeal syndromes (TRPS) result from mutations in the TRPS1 gene.
  • TRPS1 encodes a transcription factor that represses GATA-mediated transcription.
  • Transcription factor activity is regulated by posttranslational modifications like SUMOylation.

Purpose of the Study:

  • To investigate the role of SUMOylation in regulating TRPS1 function.
  • To identify SUMOylation sites on TRPS1 and their impact on transcriptional repression.

Main Methods:

  • In vivo and in vitro SUMOylation assays.
  • Interaction studies with UBC9.
  • Site-directed mutagenesis of potential SUMOylation sites.
  • Transcriptional repression assays.

Main Results:

  • TRPS1 undergoes SUMOylation at multiple sites via UBC9.
  • Wild-type UBC9 enhances TRPS1 repression, while a SUMOylation-deficient mutant does not.
  • SUMOylation at lysine residues 1192 (S4) and 1201 (S5) within the repression domain is critical.
  • Mutation of S5 and S4 abrogates TRPS1 repression activity.

Conclusions:

  • SUMOylation is a key mechanism regulating TRPS1 transcriptional repressor activity.
  • Specific SUMOylation sites within the repression domain are essential for TRPS1 function.
  • Understanding TRPS1 SUMOylation may offer insights into TRPS pathogenesis.