Heparin and Heparan Sulfate Bind to Snake Cardiotoxin

Heparin and Heparan Sulfate Bind to Snake Cardiotoxin
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肝素和硫酸乙酰肝素与蛇心脏毒素结合

DOI:
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发表时间:
1997
影响因子:
4.8
通讯作者:
Wen‐guey Wu
Wen‐guey Wu
中科院分区:
生物学2区
文献类型:
--
作者:
H. Patel;A. Vyas;K. Vyas;Yi;C. Chiang;L. Chi;Wen‐guey Wu

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眼镜蛇毒中的CTXs对多种细胞具有细胞毒性。它们会导致心脏收缩停止和严重的组织坏死。它们与磷脂的相互作用是确定的,但本身不能解释这些毒素的特异性;因此,膜的其他组分必须干预以将它们导向其靶点。本文首次利用亲和层析、圆二色性、吸光度、荧光强度及各向异性测量,显示硫酸化糖胺聚糖、肝素、硫酸乙酰肝素(HS)、硫酸软骨素(CS)和硫酸皮肤素(DS)与台湾眼镜蛇毒的主要成分CTX A3相互作用。由解离CTX-糖胺聚糖复合物所需的NaCl浓度确定的结合的相对强度变化如下:肝素> DS > CS > HS。然而,在生理缓冲液(8 mM Na 2 HPO 4,2.7 mM KCl,1.8 mM KH 2 PO 4,138 mM NaCl,pH 7.4)中,只有肝素和HS与CTX结合,解离常数分别为1.4和16 μM,而CS和DS未能表现出明确的结合行为,如荧光测量所示。基于盐依赖性结合研究,我们估计CTX与肝素发生3-4次离子接触,并且约40%的结合自由能来自生理条件下的纯静电相互作用。硫酸化五糖可足以结合CTX。我们还发现,肝素加重渗透到磷脂膜的CTX分析Langmuir单层测量。鉴于这些结果,我们建议,肝素样部分的细胞表面可能会调节CTX的作用。
Cardiotoxins (CTXs) from cobra venom show cytotoxicity toward several cell types. They cause systolic heart arrest and severe tissue necrosis. Their interaction with phospholipids is established but by itself fails to explain the specificity of these toxins; other component(s) of membrane must, therefore, intervene to direct them toward their target. We herein show, for the first time, that sulfated glycosaminoglycans, heparin, heparan sulfate (HS), chondroitin sulfate (CS), and dermatan sulfate (DS), interact with CTX A3, a major component of Taiwan cobra venom, by use of affinity chromatography, circular dichroism, absorbance, and fluorescence intensity and anisotropy measurements. The relative strength of binding, determined by the NaCl concentration required to dissociate the CTX-glycosaminoglycan complex, varied as follows: heparin > DS > CS > HS. In physiological buffer (8 mM Na2HPO4, 2.7 mM KCl, 1.8 mM KH2PO4, 138 mM NaCl, pH 7.4), however, only heparin and HS bound to CTX, with respective dissociation constants of 1.4 and 16 μM, while CS and DS failed to exhibit well defined binding behavior, as indicated by fluorescence measurements. We estimate that CTX makes 3-4 ionic contacts with heparin based on a salt-dependent binding study and that ∼40% of binding free energy is derived from purely electrostatic interactions under physiological conditions. Sulfated pentasaccharide may be sufficient to bind to CTX. We also found that heparin accentuates the penetration of CTX into phospholipid membranes as analyzed by Langmuir monolayer measurement. In view of these results we propose that heparin-like moieties of the cell surface may modulate the action of CTX.
DOI: 10.1021/bi00071a026
发表时间: 1993-05-25
期刊: BIOCHEMISTRY
影响因子: 2.9
作者:
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发表时间: 1993-08
期刊: Biochemistry
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来自肝素和硫酸乙酰肝素的新寡糖及其作为肝素降解酶底物的用途。
DOI: --
发表时间: 1983
期刊: The Journal of biological chemistry
影响因子: --
作者:
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通讯作者: Thompson,JN
肝素可阻止磷脂酶 A2 与磷脂胶束的结合:氨基末端的重要性。
DOI: 10.1021/bi00101a026
发表时间: 1991
期刊: Biochemistry
影响因子: 2.9
作者:
Diccianni,MB;Lilly-Stauderman,M;McLean,LR;Balasubramaniam,A;Harmony,JA
通讯作者: Harmony,JA