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Isoform-dependent interaction of BRDG1 with Tec kinase
K Yokohari1, Y Yamashita, S Okada
1Department of Developmental Genetics, Chiba University Graduate School of Medicine, Inohana 1-8-1, Chuo-ku, Chiba 260-8670, Japan.
Biochemical and Biophysical Research Communications
|November 22, 2001
Summary
BRDG1 enhances B-cell antigen receptor signaling by activating CREB. Its function is isoform-dependent, highlighting the role of the Pleckstrin homology domain in Tec kinase pathways.
Area of Science:
- Immunology
- Molecular Biology
- Biochemistry
Background:
- Tec kinase family members, including Tec and Btk, are crucial for B-cell immune system development.
- BRDG1 was previously identified as a downstream messenger of human Tec kinase.
- BRDG1 associates with Tec and is tyrosine-phosphorylated upon B-cell antigen receptor (BCR) engagement.
Purpose of the Study:
- To investigate the role of BRDG1 in BCR-mediated signaling.
- To characterize the murine orthologue of BRDG1 and its isoforms.
- To elucidate the regulatory mechanism of CREB (cAMP-response element binding protein) transcriptional factors.
Main Methods:
- Overexpression of BRDG1 in B-cells.
- Analysis of BCR-mediated activation of CREB, c-Jun, and gene promoters (c-MYC, BCL-xL).
- Isolation and characterization of murine BRDG1 and its splice variants.
Main Results:
- Overexpression of BRDG1 significantly enhanced BCR-mediated CREB activation.
- BRDG1 did not affect the activation of c-Jun or the promoters of c-MYC and BCL-xL genes.
- Three isoforms of murine BRDG1 were identified, with two lacking 33 amino acids in the Pleckstrin homology (PH) domain.
- Tyrosine-phosphorylation and CREB-activating ability of BRDG1 were found to be isoform-dependent, implicating the PH domain.
Conclusions:
- BRDG1 plays a significant role in augmenting BCR-mediated CREB activation.
- The Pleckstrin homology domain of BRDG1 is critical for its tyrosine-phosphorylation and CREB-activating functions.
- These findings reveal a novel regulatory mechanism for the CREB family of transcriptional factors within the Tec kinase signaling pathway.
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