ERGIC-53, a membrane protein of the ER-Golgi intermediate compartment, carries an ER retention motif.

Article Details

Citation

Schindler R, Itin C, Zerial M, Lottspeich F, Hauri HP

ERGIC-53, a membrane protein of the ER-Golgi intermediate compartment, carries an ER retention motif.

Eur J Cell Biol. 1993 Jun;61(1):1-9.

PubMed ID
8223692 [ View in PubMed
]
Abstract

Overlapping cDNAs encoding the entire human ERGIC-53, a 53 kDa membrane protein of the ER-Golgi intermediate compartment, have been isolated and their nucleotide sequence determined. The isolated cDNA is about 2.7 kb in length. The deduced polypeptide chain for ERGIC-53 consists of 510 amino acids (M(r) 54217) including an N-terminal signal sequence of 30 amino acids, a single putative transmembrane segment of 18 amino acids, and a short cytoplasmic domain of 12 amino acids. Surprisingly, the cytoplasmic segment contains two lysines positioned three and four residues from the C-terminus. Such a double lysine motif is known to function as a retention signal for a group of membrane proteins associated with the ER. Expression of a full-length cDNA of ERGIC-53 in Vero cells revealed intracellular localization similar but not always identical to the endogenously expressed ERGIC-53. The presence of an ER retention motif in a protein of the ER-Golgi intermediate compartment has important implications for the retention mechanism mediated by this signal.

DrugBank Data that Cites this Article

Polypeptides
NameUniProt ID
Protein ERGIC-53P49257Details