A splicing repressor domain in polypyrimidine tract-binding protein.
J Biol Chem
; 281(2): 800-6, 2006 Jan 13.
Article
en En
| MEDLINE
| ID: mdl-16282332
ABSTRACT
Polypyrimidine tract-binding protein (PTB) is an hnRNP with four RRM type domains. It plays roles as a repressive alternative splicing regulator of multilple target genes, as well as being involved in pre-mRNA 3' end processing, mRNA localization, stability, and internal ribosome entry site-mediated translation. Here we have used a tethered function assay, in which a fusion protein of PTB and the bacteriophage MS2 coat protein is recruited to a splicing regulatory site by binding to an artificially inserted MS2 binding site. Deletion mutations of PTB in this system allowed us to identify RRM2 and the following inter-RRM linker region as the minimal region of PTB that can act as splicing repressor domain when recruited to RNA. Splicing repression by the minimal repressor domain remained cell type-specific and dependent upon other defined regulatory elements in the alpha-tropomyosin test minigene. Our results highlight the fact that splicing repression by PTB can be uncoupled from the mode by which it binds to RNA.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Pirimidinas
/
Empalme Alternativo
/
Proteína de Unión al Tracto de Polipirimidina
Tipo de estudio:
Prognostic_studies
Límite:
Animals
/
Humans
Idioma:
En
Revista:
J Biol Chem
Año:
2006
Tipo del documento:
Article
País de afiliación:
Reino Unido