Analysis of the F-actin binding fragments of vinculin using stopped-flow and dynamic light-scattering measurements.

Analysis of the F-actin binding fragments of vinculin using stopped-flow and dynamic light-scattering measurements.
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使用停流和动态光散射测量分析纽蛋白的 F-肌动蛋白结合片段。

DOI:
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发表时间:
1998
期刊:
European Journal of Biochemistry
影响因子:
--
通讯作者:
R. Ezzell
R. Ezzell
中科院分区:
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文献类型:
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作者:
W. H. Goldmann;Z. Guttenberg;J. X. Tang;K. Kroy;G. Isenberg;R. Ezzell

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Using amino acids 884-1066 and 884-1012 expressed from chicken vinculin as fusion proteins with schistosomal glutathione S-transferase, we determined the binding kinetics of the protein fragments with F-actin. We established by the stopped-flow method a two-step binding process: an initial rapid reaction followed by a slower process. The latter is attributed to F-actin cross-linking and/or bundling, which was previously detected by viscometry and electron microscopy [Johnson, R. P. & Craig, S. W. (1995) Nature 373, 261-264]. This is also supported by dynamic light-scattering measurements, indicating dramatic changes in the internal actin filament dynamics, i.e. in bending undulations due to thermal noise. The similar size of the binding reaction for both fusion proteins with F-actin indicates that the F-actin binding site(s) on vinculin are located between residues 884-1012. No binding of pure glutathione S-transferase or its fusion protein with vinculin peptide 1012-1066 with F-actin was detected by either method.
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影响因子: 2.9
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