4E9S

Multicopper Oxidase CueO (data5)

4E9S の概要

• エントリーDOI: 10.2210/pdb4e9s/pdb
• 関連するPDBエントリー: 4E9P 4E9Q 4E9R 4E9T
• 分子名称: Blue copper oxidase CueO, COPPER (II) ION, ACETATE ION, ... (4 entities in total)
• 機能のキーワード: multicopper oxidase, metal binding protein
• 由来する生物種: Escherichia coli
• 細胞内の位置: Periplasm: P36649
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 53853.56

構造登録者

Komori, H.,Kataoka, K.,Sakurai, T.,Higuchi, Y. (登録日: 2012-03-21, 公開日: 2013-05-01, 最終更新日: 2024-03-20)

主引用文献

Kataoka, K.,Komori, H.,Ueki, Y.,Konno, Y.,Kamitaka, Y.,Kurose, S.,Tsujimura, S.,Higuchi, Y.,Kano, K.,Seo, D.,Sakurai, T.
Structure and function of the engineered multicopper oxidase CueO from Escherichia coli--deletion of the methionine-rich helical region covering the substrate-binding site.
J.Mol.Biol., 373:141-152, 2007

PubMed Abstract: CueO is a multicopper oxidase (MCO) that is involved in the homeostasis of Cu in Escherichia coli and is the sole cuprous oxidase to have ever been found. Differing from other MCOs, the substrate-binding site of CueO is deeply buried under a methionine-rich helical region including alpha-helices 5, 6, and 7 that interfere with the access of organic substrates. We deleted the region Pro357-His406 and replaced it with a Gly-Gly linker. The crystal structures of a truncated mutant in the presence and in the absence of excess Cu(II) indicated that the scaffold of the CueO molecule and metal-binding sites were reserved in comparison with those of CueO. In addition, the high thermostability of the protein molecule and its spectroscopic and magnetic properties due to four Cu centers were also conserved after truncation. As for functions, the cuprous oxidase activity of the mutant was reduced to ca 10% that of recombinant CueO owing to the decrease in the affinity of the labile Cu site for Cu(I) ions, although activities for laccase substrates such as 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid), p-phenylenediamine, and 2,6-dimethoxyphenol increased due to changes in the access of these organic substrates to the type I Cu site. The present engineering of CueO indicates that the methionine-rich alpha-helices function as a barrier to the access of bulky organic substrates, which provides CueO with specificity as a cuprous oxidase.

PubMed: 17804014
DOI: 10.1016/j.jmb.2007.07.041

実験手法

X-RAY DIFFRACTION (1.06 Å)