Nuclear membrane protein emerin: roles in gene regulation, actin dynamics and human disease.
Novartis Found Symp
; 264: 51-58; discussion 58-62, 227-30, 2005.
Article
em En
| MEDLINE
| ID: mdl-15773747
ABSTRACT
Loss of emerin, a nuclear membrane protein, causes Emery-Dreifuss muscular dystrophy (EDMD), characterized by muscle weakening, contractures of major tendons and potentially lethal cardiac conduction system defects. Emerin has a LEM-domain and therefore binds barrier-to-autointegration factor (BAF), a conserved chromatin protein essential for cell division. BAF recruits emerin to chromatin and regulates higher-order chromatin structure during nuclear assembly. Emerin also binds filaments formed by A-type lamins, mutations in which also cause EDMD. Other partners for emerin include nesprin-1alpha and transcriptional regulators such as germ cell-less (GCL). The binding affinities of these partners range from 4nM (nesprin-1alpha) to 200 nM (BAF), and are physiologically significant. Biochemical studies therefore provide a valid means to predict the properties of emerin-lamin complexes in vivo. Emerin and lamin A together form stable complexes with either BAF or GCL in vitro. BAF, however, competes with GCL for binding to emerin in vitro. These and additional partners, notably actin and nuclear myosin II, suggest disease-relevant roles for emerin in gene regulation and the mechanical interity of the nucleus.
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Bases de dados:
MEDLINE
Assunto principal:
Timopoietinas
/
Regulação da Expressão Gênica
/
Actinas
/
Proteínas de Membrana
/
Distrofias Musculares
/
Membrana Nuclear
Tipo de estudo:
Prognostic_studies
Limite:
Animals
/
Humans
Idioma:
En
Revista:
Novartis Found Symp
Assunto da revista:
MEDICINA
Ano de publicação:
2005
Tipo de documento:
Article
País de afiliação:
Estados Unidos