Imaging of voltage-gated alamethicin pores in a reconstituted bilayer lipid membrane via scanning electrochemical microscopy.

Imaging of voltage-gated alamethicin pores in a reconstituted bilayer lipid membrane via scanning electrochemical microscopy.
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通过扫描电化学显微镜对重建双层脂质膜中的电压门控阿拉甲辛孔进行成像。

DOI:
10.1039/b510649d
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发表时间:
2006
期刊:
The Analyst
影响因子:
--
通讯作者:
Cliffel,DavidE
Cliffel,DavidE
中科院分区:
--
文献类型:
--
作者:
Wilburn,JeremyP;Wright,DavidW;Cliffel,DavidE

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通过在重组的磷脂酰胆碱双层脂质膜(BLMs)中插入肽抗生素alamethicin,模拟了电压门控的生物离子通道。利用扫描电化学显微镜(SECM)来探测BLM的初始电阻率、alamethicin孔的插入以及质量在膜上的传递。获取的SECM图像显示了插入孔束的空间位置,验证了电压对孔构象状态(打开/关闭)的控制,以及对应于BLM不同地形区域的被动质量传递的变化。SECM图像还用于评估插入前BLM的整体完整性以及插入后的输运(开放状态下的通量)和泄漏(关闭状态下的通量)电流。
Voltage-gated biological ion channels were simulated by insertion of the peptaibol antibiotic alamethicin into reconstituted phosphatidylcholine bilayer lipid membranes (BLMs). Scanning electrochemical microscopy (SECM) was utilized to probe initial BLM resistivity, the insertion of alamethicin pores, and mass transport across the membrane. Acquired SECM images show the spatial location of inserted pore bundles, the verification of voltage control over the pore conformational state (open/closed), and variations in passive mass transport corresponding to different topographical areas of the BLM. SECM images were also used to evaluate overall BLM integrity prior to insertion as well as transport (flux in open state) and leakage (flux in closed state) currents following insertion.
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