1LHM

THE CRYSTAL STRUCTURE OF A MUTANT LYSOZYME C77(SLASH)95A WITH INCREASED SECRETION EFFICIENCY IN YEAST

1LHM の概要

• エントリーDOI: 10.2210/pdb1lhm/pdb
• 分子名称: HUMAN LYSOZYME (2 entities in total)
• 機能のキーワード: hydrolase (o-glycosyl)
• 由来する生物種: Homo sapiens (human)
• 細胞内の位置: Secreted: P61626
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 14656.56

構造登録者

Inaka, K.,Matsushima, M. (登録日: 1991-10-02, 公開日: 1992-04-15, 最終更新日: 2024-11-20)

主引用文献

Inaka, K.,Taniyama, Y.,Kikuchi, M.,Morikawa, K.,Matsushima, M.
The crystal structure of a mutant human lysozyme C77/95A with increased secretion efficiency in yeast.
J.Biol.Chem., 266:12599-12603, 1991

PubMed Abstract: The three-dimensional structure of a mutant human lysozyme, C77/95A, in which residues Cys77 and Cys95 were replaced by alanine, was determined at 1.8-A resolution by x-ray crystallography. The properties of this mutant protein have been well characterized with respect to its thermal stability and secretion efficiency in a yeast expression system. The overall three-dimensional structure of C77/95A was found to be essentially identical to that of the wild-type human lysozyme, although the coordinates were shifted by more than 0.5 A and the thermal factors of the main-chain atoms were increased in the vicinity of residue 77. The reduction in thermal stability of this mutant has been previously explained by an increase in entropy of the unfolded state. In addition, a packing defect (cavity) produced by the removal of the disulfide bond was detected in the three-dimensional structure of C77/95A. This cavity can also be a reason why the stability of the protein is reduced because the free energy of the folded state could be expected to increase. The increased secretion efficiency cannot be due mainly to the three-dimensional structure, but may possibly be related to some event in the pathway of protein secretion. One of the possibilities might involve molecular flexibilities in the secondary or tertiary structure for lack of one of the disulfide bonds.

PubMed: 2061330

実験手法

X-RAY DIFFRACTION (1.8 Å)