A novel endocytosis signal related to the KKXX ER-retrieval signal.
EMBO J
; 14(10): 2250-6, 1995 May 15.
Article
em En
| MEDLINE
| ID: mdl-7774583
ABSTRACT
Membrane proteins often contain a sorting signal in their cytoplasmic tail that promotes their clustering into coated vesicles at a specific cellular site. ERGIC-53 contains a cytoplasmic ER-retrieval signal, KKFF. However, overexpressed ERGIC-53 is transported to the cell surface and rapidly endocytosed. Here we report that ERGIC-53 carries a previously undescribed endocytosis signal. Surprisingly, the signal was KKFF and like the ER-retrieval signal required a C-terminal position. In fact, the minimal consensus sequence determined by substitutional mutagenesis (K-K/R-F/Y-F/Y) was related to the ER-retrieval consensus (K-K-X-X). Furthermore, we provide evidence that internalization of VIP36, a protein that cycles between plasma membrane and Golgi, is mediated by a signal at its C-terminus that matches the internalization consensus sequence. The relatedness of the two signals suggests that coatomer-mediated retrieval of proteins may be mechanistically more related to clathrin-dependent sorting than previously anticipated.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Oligopeptídeos
/
Compartimento Celular
/
Lectinas de Ligação a Manose
/
Endocitose
/
Retículo Endoplasmático
/
Proteínas de Membrana
Limite:
Animals
Idioma:
En
Revista:
EMBO J
Ano de publicação:
1995
Tipo de documento:
Article
País de afiliação:
Suíça