Finke-Watzky Two-Step Nucleation-Autocatalysis Model of S100A9 Amyloid Formation: Protein Misfolding as "Nucleation" Event

被引:52
作者
Iashchishyn, Igor A. [1 ,2 ]
Sulskis, Darius [1 ,3 ]
Mai Nguyen Ngoc [3 ]
Smirnovas, Vytautas [3 ]
Morozova-Roche, Ludmilla A. [1 ]
机构
[1] Umea Univ, Dept Med Biochem & Biophys, SE-90187 Umea, Sweden
[2] Sumy State Univ, Dept Gen Chem, UA-40007 Sumy, Ukraine
[3] Vilnius Univ, Inst Biotechnol, Dept Biothermodynam & Drug Design, LT-10257 Vilnius, Lithuania
基金
英国医学研究理事会;
关键词
Amyloid; autocatalysis; Finke-Watzky model; growth; kinetics; nucleation; S100A9; PRO-INFLAMMATORY S100A9; ALZHEIMERS-DISEASE; EXPRESSION; MRP14; AGGREGATION; MECHANISM;
D O I
10.1021/acschemneuro.7b00251
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Quantitative kinetic analysis is critical for understanding amyloid mechanisms. Here we demonstrate the application of generic Finke-Watzky (F-W) two-step nucleation-autocatalytic growth model to the concentration-dependent amyloid kinetics of proinflammatory alpha-helical S100A9 protein at pH 7.4 and at 37 and 42 degrees C. The model is based on two pseudoelementary reaction steps applied without further analytical constraints, and its treatment of S100A9 amyloid self-assembly demonstrates that initial misfolding and beta-sheet formation, defined as "nucleation" step, spontaneously takes place within individual S100A9 molecules at higher rate than the subsequent fibrillar growth. The latter, described as an autocatalytic process, will proceed if misfolded amyloid-prone S100A9 is populated on a macroscopic time scale. Short lengths of S100A9 fibrils are consistent with the F-W model. The analysis of fibrillar length distribution by the Beker-Doring model demonstrates independently that such distribution is solely determined by slow fibril growth and there is no fragmentation or secondary pathways decreasing fibrillar length.
引用
收藏
页码:2152 / 2158
页数:7
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