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:
影响因子:
--
通讯作者:
Lee JC
中科院分区:
文献类型:
--
作者:
Pfefferkorn CM;Lee JC
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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DOI:
10.1073/pnas.0407146102
发表时间:
2005-02-01
影响因子:
11.1
作者:
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通讯作者:
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DOI:
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发表时间:
2000-01-18
影响因子:
11.1
作者:
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通讯作者:
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影响因子:
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