ERO1-L, a human protein that favors disulfide bond formation in the endoplasmic reticulum - PubMed (original) (raw)

. 2000 Feb 18;275(7):4827-33.

doi: 10.1074/jbc.275.7.4827.

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ERO1-L, a human protein that favors disulfide bond formation in the endoplasmic reticulum

A Cabibbo et al. J Biol Chem. 2000.

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Abstract

Oxidizing conditions must be maintained in the endoplasmic reticulum (ER) to allow the formation of disulfide bonds in secretory proteins. Here we report the cloning and characterization of a mammalian gene (ERO1-L) that shares extensive homology with the Saccharomyces cerevisiae ERO1 gene, required in yeast for oxidative protein folding. When expressed in mammalian cells, the product of the human ERO1-L gene co-localizes with ER markers and displays Endo-H-sensitive glycans. In isolated microsomes, ERO1-L behaves as a type II integral membrane protein. ERO1-L is able to complement several phenotypic traits of the yeast thermosensitive mutant ero1-1, including temperature and dithiothreitol sensitivity, and intrachain disulfide bond formation in carboxypeptidase Y. ERO1-L is no longer functional when either one of the highly conserved Cys-394 or Cys-397 is mutated. These results strongly suggest that ERO1-L is involved in oxidative ER protein folding in mammalian cells.

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