3uj1
Crystal structure of the third thioredoxin domain of human ERp46
Structural highlights
FunctionTXND5_HUMAN Possesses thioredoxin activity. Has been shown to reduce insulin disulfide bonds. Also complements protein disulfide-isomerase deficiency in yeast (By similarity). Publication Abstract from PubMedThe protein disulfide isomerase (PDI) family member ERp46/endoPDI/thioredoxin domain-containing protein 5 is preferentially expressed in a limited number of tissues, where it may function as a survival factor for nitrosative stress in vivo. It is involved in insulin production as well as in adiponectin signaling and interacts specifically with the redox-regulatory endoplasmic reticulum proteins endoplasmic oxidoreductin 1alpha (Ero1alpha) and peroxiredoxin-4. Here, we show that ERp46, although lacking a PDI-like redox-inactive b'-thioredoxin domain with its hydrophobic substrate binding site, is able to bind to a large pool of peptides containing aromatic and basic residues via all three of its catalytic domains (a(0), a and a'), though the a(0) domain may contain the primary binding site. ERp46, which shows relatively higher activity as a disulfide-reductase than as an oxidase/isomerase in vitro compared to PDI and ERp57, possesses chaperone activity in vivo, a property also shared by the C-terminal a' domain. A crystal structure of the a' domain is also presented, offering a view of possible substrate binding sites within catalytic domains of PDI proteins. Peptide Binding by Catalytic Domains of the Protein Disulfide Isomerase-Related Protein ERp46.,Funkner A, Parthier C, Schutkowski M, Zerweck J, Lilie H, Gyrych N, Fischer G, Stubbs MT, Ferrari DM J Mol Biol. 2013 Jan 30. pii: S0022-2836(13)00045-4. doi:, 10.1016/j.jmb.2013.01.029. PMID:23376096[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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