Tryptophan probes at the alpha-synuclein and membrane interface.

Tryptophan probes at the alpha-synuclein and membrane interface.
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DOI:
10.1021/jp908092e
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发表时间:
2010-04-08
期刊:
The journal of physical chemistry. B
影响因子:
--
通讯作者:
Lee JC
Lee JC
中科院分区:
其他
文献类型:
--
作者:
Pfefferkorn CM;Lee JC

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了解环境因素如何影响α-突触核蛋白(α-syn)的构象动力学是非常重要的,因为聚集的α-syn在大脑中的积累和沉积与帕金森病的病因密切相关。对单个含色氨酸α-syn变异体的稳态和时间分辨荧光测量显示,在残基4、39、94和125处存在明显的磷脂囊泡和胶束相互作用。我们的圆二色性(CD)数据证实,色氨酸突变不影响α-syn膜结合特性(所有突触核蛋白的表观结合常数),估计脂质与蛋白质的摩尔比为380或约120个蛋白质,覆盖80 nm直径囊泡表面积的7%。位置4和94的荧光团对脂质双分子层最敏感,具有明显的光谱蓝移(W4: Δλmax ~23 nm; W94: Δλmax ~10 nm)和量子产率增加(W4, W94: ~3倍),而W39和W125主要保持水暴露。时间分辨荧光数据显示所有位点(W125除外)都有与膜相互作用的亚群。
Understanding how environmental factors affect the conformational dynamics of α-synuclein (α-syn) is of great importance because the accumulation and deposit of aggregated α-syn in the brain are intimately connected to Parkinson’s disease etiology. Measurements of steady-state and time-resolved fluorescence of single tryptophan-containing α-syn variants have revealed distinct phospholipid vesicle and micelle interactions at residues 4, 39, 94, and 125. Our circular dichroism (CD) data confirm that Trp mutations do not affect α-syn membrane binding properties (apparent association constant for all synucleins) saturating at an estimated lipid-to-protein molar ratio of 380 or approximately 120 proteins covering ~7% of the surface area of an 80 nm diameter vesicle. Fluorophores at positions 4 and 94 are the most sensitive to the lipid bilayer with pronounced spectral blue-shifts (W4: Δλmax ~23 nm; W94: Δλmax ~10 nm) and quantum yield increases (W4, W94: ~3 fold) while W39 and W125 remain primarily water-exposed. Time-resolved fluorescence data show that all sites (except W125) have subpopulations that interact with the membrane.
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