ERdj5, an Endoplasmic Reticulum (ER)-resident Protein Containing DnaJ and Thioredoxin Domains, Is Expressed in Secretory Cells or following ER Stress

• Published in: The Journal of biological chemistry 2003-01, Vol.278 (2), p.1059-1066
• Main Authors: Cunnea, Paula M., Miranda-Vizuete, Antonio, Bertoli, Gloria, Simmen, Thomas, Damdimopoulos, Anastasios E., Hermann, Stefan, Leinonen, Saku, Huikko, Markku Pelto, Gustafsson, Jan-Åke, Sitia, Roberto, Spyrou, Giannis
• Format: Article
• Language: English
• Subjects: Adenosine Triphosphate - pharmacology; Amino Acid Sequence; Carrier Proteins - metabolism; Chromosome Mapping; Cloning, Molecular; Endoplasmic Reticulum - chemistry; Endoplasmic Reticulum - metabolism; Endoplasmic Reticulum Chaperone BiP; Heat-Shock Proteins - chemistry; HSP40 Heat-Shock Proteins; Humans; Medicin och hälsovetenskap; Molecular Chaperones - analysis; Molecular Chaperones - chemistry; Molecular Chaperones - genetics; Molecular Chaperones - metabolism; Molecular Sequence Data; Protein Folding; Protein Transport; Sequence Alignment; Thioredoxins - chemistry
• ISSN: 0021-9258; 1083-351X; 1083-351X
• DOI: 10.1074/jbc.M206995200

A complex array of chaperones and enzymes reside in the endoplasmic reticulum (ER) to assist the folding and assembly of and the disulfide bond formation in nascent secretory proteins. Here we characterize a novel human putative ER co-chaperone (ERdj5) containing domains resembling DnaJ, protein-disulfide isomerase, and thioredoxin domains. Homologs of ERdj5 have been found in Caenorhabditis elegans and Mus musculus. In vitroexperiments demonstrated that ERdj5 interacts via its DnaJ domain with BiP in an ATP-dependent manner. ERdj5 is a ubiquitous protein localized in the ER and is particularly abundant in secretory cells. Its transcription is induced during ER stress, suggesting potential roles for ERdj5 in protein folding and translocation across the ER membrane.