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Binding and cooperative interactions between two B cell-specific transcriptional coactivators
J D Fontes1, N Jabrane-Ferrat, C R Toth
1Howard Hughes Medical Institute, Departments of Medicine, University of California, at San Francisco 94143-0724, USA.
The Journal of Experimental Medicine
|June 1, 1996
Summary
Class II transactivator (CIITA) and B cell coactivator Bob1 are key proteins in B cell gene expression. CIITA enhances class II gene expression by interacting with and recruiting Bob1 to promoters.
Area of Science:
- Immunology
- Molecular Biology
- Genetics
Background:
- Class II transactivator (CIITA) and B cell octamer-binding protein 1 (Bob1) are B cell-specific transcriptional coactivators.
- CIITA and Bob1 interact with proteins involved in regulating major histocompatibility complex (MHC) class II genes and octamer-binding transcription factors.
Purpose of the Study:
- To investigate the interaction between CIITA and Bob1.
- To elucidate the role of CIITA in modulating Bob1's function in B cells.
- To understand the mechanism of transcriptional activation of class II promoters in B cells.
Main Methods:
- In vivo and in vitro binding assays.
- Analysis of gene expression from the DRA promoter.
- Investigating protein-protein interactions.
Main Results:
- Both CIITA and Bob1 enhance expression from the DRA promoter, a key class II promoter.
- CIITA facilitates interactions between class II promoters and Bob1, independent of the octamer-binding site.
- Direct binding between Bob1 and CIITA was confirmed.
Conclusions:
- CIITA is a crucial activator of class II gene expression in B cells.
- CIITA recruits the B cell-specific coactivator Bob1 to enhance the transcriptional activity of class II promoters.
- This interaction highlights a cooperative mechanism for regulating immune gene expression in B lymphocytes.