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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク PDIA3 ： ウィキペディア英語版 PDIA3 Protein disulfide-isomerase A3 (PDIA3), also known as glucose-regulated protein, 58-kD (GRP58), is an isomerase enzyme. This protein localizes to the endoplasmic reticulum (ER) and interacts with lectin chaperones calreticulin and calnexin (CNX) to modulate folding of newly synthesized glycoproteins. It is thought that complexes of lectins and this protein mediate protein folding by promoting formation of disulfide bonds in their glycoprotein substrates.〔(【引用サイトリンク】 url = http://www.ncbi.nlm.nih.gov/gene/2923 )〕 == Structure == The PDIA3 protein consists of four thioredoxin-like domains: a, b, b′, and a′. The a and a′ domains have Cys-Gly-His-Cys active site motifs (C57-G58-H59-C60 and C406-G407-H408-C409) and are catalytically active. The bb′ domains contain a CNX binding site, which is composed of positively charged, highly conserved residues (K214, K274, and R282) that interact with the negatively charged residues of the CNX P domain. The b′ domain comprises the majority of the binding site, but the β4-β5 loop of the b domain provides additional contact (K214) to strengthen the interaction.〔 A transient disulfide bond forms between the N-terminal cysteine in the catalytic motif and a substrate, but in a step called "escape pathway", the bond is disrupted as the C-terminal cysteine attacks the N-terminal cysteine to release the substrate.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「PDIA3」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.