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Transcriptional modification by a CASK-interacting nucleosome assembly protein
Guey-Shin Wang1, Chen-Jei Hong, Tsen-Yann Yen
1Institute of Molecular Biology, Academia Sinica, National Yang-Ming University, Taipei, Taiwan, ROC.
Neuron
|April 7, 2004
Summary
Calcium/calmodulin-dependent serine protein kinase (CASK) coactivates Tbr-1 in brain development. A newly identified protein, CINAP, interacts with CASK and Tbr-1, regulating gene expression, including NR2b, and is degraded by NMDA stimulation.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- CASK is a known coactivator for Tbr-1, crucial for cerebral cortex development.
- The precise molecular mechanism of CASK's coactivation role remains largely unknown.
Purpose of the Study:
- To elucidate the molecular mechanism underlying CASK's coactivation of Tbr-1.
- To identify novel interacting partners of CASK involved in transcriptional regulation.
Main Methods:
- Co-immunoprecipitation to identify CASK-interacting proteins.
- Western blotting to assess protein levels and degradation.
- Reporter gene assays to measure promoter activity.
- siRNA-mediated knockdown to study endogenous CINAP function.
Main Results:
- CASK interacts with CINAP, a histone-binding protein involved in nucleosome assembly.
- The CASK-CINAP complex interacts with Tbr-1, regulating target genes like NR2b and reelin.
- Knockdown of CINAP reduces NR2b promoter activity in hippocampal neurons.
- NMDA stimulation induces proteasomal degradation of CINAP, decreasing NR2b expression.
Conclusions:
- CINAP acts as a molecular bridge between CASK/Tbr-1 and chromatin.
- Synaptic stimulation-induced reduction of CINAP protein modulates Tbr-1/CASK/CINAP complex activity.
- This mechanism regulates NR2b gene expression during neuronal activity.