Tarantula toxins interact with voltage sensors within lipid membranes.
Tarantula toxins interact with voltage sensors within lipid membranes.
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DOI:
10.1085/jgp.200709869
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发表时间:
2007-11
期刊:
影响因子:
--
通讯作者:
Swartz KJ
中科院分区:
文献类型:
--
作者:
Milescu M;Vobecky J;Roh SH;Kim SH;Jung HJ;Kim JI;Swartz KJ
Voltage-activated ion channels are essential for electrical signaling, yet the mechanism of voltage sensing remains under intense investigation. The voltage-sensor paddle is a crucial structural motif in voltage-activated potassium (Kv) channels that has been proposed to move at the protein–lipid interface in response to changes in membrane voltage. Here we explore whether tarantula toxins like hanatoxin and SGTx1 inhibit Kv channels by interacting with paddle motifs within the membrane. We find that these toxins can partition into membranes under physiologically relevant conditions, but that the toxin–membrane interaction is not sufficient to inhibit Kv channels. From mutagenesis studies we identify regions of the toxin involved in binding to the paddle motif, and those important for interacting with membranes. Modification of membranes with sphingomyelinase D dramatically alters the stability of the toxin–channel complex, suggesting that tarantula toxins interact with paddle motifs within the membrane and that they are sensitive detectors of lipid–channel interactions.
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DOI:
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发表时间:
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期刊:
The Journal of general physiology
影响因子:
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通讯作者:
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