Insights into the conformational changes of several human lysozyme variants associated with hereditary systemic amyloidosis

Hsuan Liang Liu, Yi Ching Wu, Jian Hua Zhao, Yi Fan Liu, Chi Hung Huang, Hsu Wei Fang, Yih Ho

研究成果: 雜誌貢獻文章同行評審

5 引文 斯高帕斯(Scopus)

摘要

In this study, various ethanol- and temperature-induced molecular dynamics simulations were conducted to investigate the conformational changes of several human lysozyme variants (I56T, D67H, and T70N) associated with hereditary systemic amyloidosis. The results show that these variants are all more sensitive to conditions affecting the structural integrity of this protein. The structural analyses of these variants reveal a high population of more unstable β-domain and distorted hydrophobic core compared to the wild-type human lysozyme, particularly for the two natural amyloidogenic variants D67H and I56T. For the D67H variant, the distance between the mass centers of residues 54 and 67 was found to elongate as a result of the destruction of the hydrogen-bonding network stabilizing the two long loops in the β-domain. It further accelerates the unfolding of this variant, starting from the hydrophobic core between the α- and β-domains. For the I56T variant, the introduction of a hydrophilic residue in the hydrophobic core directly destroys the native contacts in the α-β interface, leading to fast unfolding. The present results are consistent with the previous hypothesis suggesting that the distortion of the hydrophobic core at the α-β interface putatively results in the formation of the initial "seed" for amyloid fibrils.
原文英語
頁(從 - 到)246-254
頁數9
期刊Biotechnology Progress
23
發行號1
DOIs
出版狀態已發佈 - 一月 2007

ASJC Scopus subject areas

  • 食品科學
  • 生物技術
  • 微生物學

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