Site-specific interaction between α-synuclein and membranes probed by NMR-observed methionine oxidation rates.

Site-specific interaction between α-synuclein and membranes probed by NMR-observed methionine oxidation rates.
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NMR观察到的蛋氨酸氧化速率探测的α-突触核蛋白和膜之间的位点特异性相互作用。

DOI:
10.1021/ja312415q
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发表时间:
2013-02-27
影响因子:
15
通讯作者:
Bax, Ad
Bax, Ad
中科院分区:
化学1区
文献类型:
--
作者:
Maltsev, Alexander S.;Chen, Jue;Levine, Rodney L.;Bax, Ad

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α-突触核蛋白(αS)是一种内在无序的水溶性蛋白,但也可以结合带负电荷的脂质膜,并采用α-螺旋构象。膜亲和力通过翻译后n端乙酰化而增加,这是所有真核细胞中常见的修饰。当含有少量过氧化脂质的脂质囊泡存在时,αS中的n端Met残基(Met1和Met5)迅速氧化,同时将有毒的脂质过氧化氢还原为非活性的脂质氢氧化物,而c端Met残基则不受影响。利用核磁共振光谱可以方便、定量地探测金属氧化物的氧化过程。结果表明,Met1的氧化降低了Met5的氧化速率,反之亦然,这是由于部分氧化蛋白的膜亲和力降低。Met氧化对α - s膜亲和力的影响可以延伸到很远的距离,如在V49M突变体中,Met1和Met5的氧化强烈影响Met49的氧化速率,反之亦然。在不与膜结合的情况下,αS的氧化Met1和Met5是蛋氨酸亚砜还原酶(Msr)的良好底物,从而为水溶性Msr酶提供了有效的载体,以保护膜免受氧化损伤。
α-Synuclein (αS) is an intrinsically disordered protein that is water-soluble but also can bind negatively charged lipid membranes while adopting an α-helical conformation. Membrane affinity is increased by post-translational N-terminal acetylation, a common modification in all eukaryotic cells. In the presence of lipid vesicles containing a small fraction of peroxidized lipids, the N-terminal Met residues in αS (Met1 and Met5) rapidly oxidize while reducing the toxic lipid hydroperoxide to a nonreactive lipid hydroxide, whereas C-terminal Met residues remain unaffected. Met oxidation can be probed conveniently and quantitatively by NMR spectroscopy. The results show that oxidation of Met1 reduces the rate of oxidation of Met5 and vice versa as a result of decreased membrane affinity of the partially oxidized protein. The effect of Met oxidation on the αS–membrane affinity extends over large distances, as in the V49M mutant, oxidation of Met1 and Met5 strongly impacts the oxidation rate of Met49 and vice versa. When not bound to membrane, oxidized Met1 and Met5 of αS are excellent substrates for methionine sulfoxide reductase (Msr), thereby providing an efficient vehicle for water-soluble Msr enzymes to protect the membrane against oxidative damage.
DOI: 10.1021/bi300642h
发表时间: 2012-06-26
期刊: Biochemistry
影响因子: 2.9
作者:
Maltsev AS;Ying J;Bax A
通讯作者: Bax A
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发表时间: 1996-08-01
影响因子: 3.2
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DOI: 10.1021/bi060627f
发表时间: 2006-10-03
期刊: BIOCHEMISTRY
影响因子: 2.9
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DOI: 10.1126/science.1227157
发表时间: 2012-11-16
期刊: Science (New York, N.Y.)
影响因子: --
作者:
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通讯作者: Lee VM
DOI: 10.1073/pnas.1005005107
发表时间: 2010-11-09
影响因子: 11.1
作者:
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通讯作者: Chandra, Sreeganga S.