Spectroscopic studies of a phosphoinositide-binding peptide from gelsolin: behavior in solutions of mixed solvent and anionic micelles.

Spectroscopic studies of a phosphoinositide-binding peptide from gelsolin: behavior in solutions of mixed solvent and anionic micelles.
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凝溶胶蛋白中磷酸肌醇结合肽的光谱研究:混合溶剂和阴离子胶束溶液中的行为。

DOI:
10.1016/s0006-3495(95)80140-2
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发表时间:
1995
期刊:
Biophysical journal.
影响因子:
--
通讯作者:
Braunlin,WH
Braunlin,WH
中科院分区:
--
文献类型:
--
作者:
Xian,W;Vegners,R;Janmey,PA;Braunlin,WH

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肽G(150-169)对应于明胶上的磷脂酰肌醇4,5-二磷酸(PIP2)和丝状肌动蛋白(F-肌动蛋白)结合部位(残基150-169,序列为KHVVPNEVVVQRLFQVKGRR)。作为了解G(150-169)与PIP2相互作用的结构方面的第一步,通过1H核磁共振测定了该肽在三氟乙醇(TFE)水溶液中的构象。圆二色谱实验表明,G(150-169)在50%TFE水溶液中和在PIP2胶束存在下都以α-螺旋形式为主,从而建立了两种构象之间的联系。G(150-169)在TFE共溶剂中的1H核磁共振实验表明,螺旋区从Pro-154延伸到Lys-166。这种螺旋结构的两亲性可能是理解多肽与脂类结合的关键。十二烷基硫酸钠胶束溶液被用作阴离子类脂环境的模型。对G(150-169)在十二烷基硫酸钠胶束溶液中构象的初步研究表明,G(150-169)在TFe共溶剂中形成类似于TFe共溶剂的α-螺旋,但结构有所不同。荧光实验提供了在较窄的多肽/PIP2比例范围内多肽聚集的证据,这可能与PIP2的生物学功能有关。
The peptide G(150–169) corresponds to a phosphatidylinositol 4,5-bisphosphate (PIP2) and filamentous actin (F-actin) binding site on gelsolin (residues 150–169, with the sequence KHVVPNEVVVQRLFQVKGRR). The conformation of this peptide in trifluoroethanol (TFE) aqueous solution was determined by 1H nuclear magnetic resonance as the first step toward understanding the structural aspects of the interaction of G(150–169) and PIP2. The circular dichroism experiments show that G(150–169) adopts a predominantly alpha-helical form in both 50% TFE aqueous solution and in the presence of PIP2 micelles, therefore establishing a connection between the two conformations. 1H nuclear magnetic resonance experiments of G(150–169) in TFE co-solvent show that the helical region extends from Pro-154 to Lys-166. The amphiphilic nature of this helical structure may be the key to understanding the binding of the peptide to lipids. Sodium dodecyl sulfate micelle solution is used as a model for anionic lipid environments. Preliminary studies of the conformation of G(150–169) in sodium dodecyl sulfate micelle solution show that the peptide forms an alpha-helix similar to but with some structural differences from that in TFE co-solvent. Fluorescence experiments provide evidence of peptide clustering over a narrow range of peptide/PIP2 ratios, which is potentially relevant to the biological function of PIP2.
表面活性剂和脂质溶液中人β-内啡肽的圆二色性和蛋白水解。
DOI: --
发表时间: 1990
期刊: Biochimica et Biophysica Acta
影响因子: --
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肌动蛋白切片
DOI: --
发表时间: 1993
期刊: Nature
影响因子: 64.8
作者:
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DOI: 10.1016/s0021-9258(19)49772-x
发表时间: 1992
期刊: The Journal of biological chemistry
影响因子: --
作者:
P. Janmey;J. Lamb;P. G. Allen;P. Matsudaira
通讯作者: P. Janmey;J. Lamb;P. G. Allen;P. Matsudaira
DOI: --
发表时间: 1986
期刊: Proteins
影响因子: --
作者:
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通讯作者: J. W. Nelson;N. Kallenbach
DOI: 10.1016/0022-2364(81)90037-8
发表时间: 1981-01-01
影响因子: 2.2
作者:
MACURA, S;HUANG, Y;ERNST, RR
通讯作者: ERNST, RR