1IOC

CRYSTAL STRUCTURE OF MUTANT HUMAN LYSOZYME, EAEA-I56T

1IOC の概要

• エントリーDOI: 10.2210/pdb1ioc/pdb
• 関連するPDBエントリー: 1C7P
• 分子名称: LYSOZYME C, SODIUM ION (3 entities in total)
• 機能のキーワード: amyloid, mutant, human lysozyme, stability, hydrolase
• 由来する生物種: Homo sapiens (human)
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 15177.99

構造登録者

Goda, S.,Takano, K.,Yamagata, Y.,Yutani, K. (登録日: 2001-02-27, 公開日: 2002-10-09, 最終更新日: 2024-10-23)

主引用文献

Goda, S.,Takano, K.,Yamagata, Y.,Maki, S.,Namba, K.,Yutani, K.
Elongation in a beta-structure promotes amyloid-like fibril formation of human lysozyme.
J.Biochem., 132:655-661, 2002

PubMed Abstract: To understand the mechanism of amyloid fibril formation of a protein, we examined wild-type and three mutant human lysozymes containing both amyloidogenic and non-amyloidogenic proteins: I56T (amyloidogenic); EAEA, which has four additional residues (Glu-Ala-Glu-Ala-) at the N-terminus located on a beta-structure; and EAEA-I56T, which is an I56T mutant of EAEA. All formed amyloid-like fibrils through an in the increase contents of alpha-helix with increasing concentration of ethanol. The order of propensity for amyloid-like fibril formation in highly concentrated ethanol solution is EAEA-I56T > EAEA > I56T > wild-type. This order is almost the reverse of the order of conformational stability of these proteins, wild-type > EAEA > I56T > EAEA-I56T. The important views in this work are as follows. (i) Artificially modified proteins formed amyloid fibrils in vitro. This means that amyloid formation is a generic property of polypeptide chains. (ii) The amyloidogenic mutation Ile56 to Thr caused the destabilization and promoted fibril formation in the wild-type and EAEA human lysozymes, indicating that instability facilitates amyloid formation. (iii) The mutant protein EAEA human lysozyme had higher propensity for fibril formation than the amyloidogenic mutant protein, indicating that amyloid formation is controlled not only by stability but also by other factors. In this case, appending polypeptide chains to a beta-structure accelerated amyloid formation.

PubMed: 12359083
DOI: 10.1093/oxfordjournals.jbchem.a003270

実験手法

X-RAY DIFFRACTION (2.4 Å)