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Multiple receptor interaction domains of GRIP1 function in synergy
S Schmidt1, A Baniahmad, M Eggert
1Genetisches Institut der Justus-Liebig Universität Giessen, Heinrich-Buff-Ring 58-62, D-35392 Giessen, Germany.
Nucleic Acids Research
|April 4, 1998
Summary
GRIP1 acts as a coactivator for nuclear hormone receptors, enhancing their transcriptional activity. Multiple LXXLL motifs in GRIP1 are crucial for this interaction and functional interference, with more than one motif needed for significant modulation.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- Nuclear hormone receptors regulate gene transcription by interacting with various protein factors.
- GRIP1 is a recently identified coactivator that enhances nuclear hormone receptor activity.
Purpose of the Study:
- To investigate the receptor-interacting regions within GRIP1.
- To determine the role of LXXLL motifs in GRIP1-mediated transcriptional regulation.
Main Methods:
- Yeast two-hybrid assays were employed using the hormone-binding domain of nuclear hormone receptors as bait.
- Analysis of protein fragments with varying numbers of LXXLL motifs to assess their impact on transcriptional activity.
Main Results:
- GRIP1 contains at least two receptor-interacting regions and interacts with multiple nuclear hormone receptors in a hormone-dependent manner.
- Multiple LXXLL motifs within GRIP1 are essential for receptor interaction and functional coactivation.
- While one LXXLL motif is sufficient for receptor binding, more than one is required for effective modulation of transcriptional activity.
Conclusions:
- GRIP1 functions as a key coactivator for nuclear hormone receptors.
- The number of LXXLL motifs in GRIP1 dictates its efficacy in modulating receptor-driven transcription.