Voltage-dependent conformational changes of KVAP S4 segment in bacterial membrane environment.
Voltage-dependent conformational changes of KVAP S4 segment in bacterial membrane environment.
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DOI:
10.4161/chan.3.5.9697
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发表时间:
2009-09
期刊:
影响因子:
--
通讯作者:
Papazian DM
中科院分区:
文献类型:
--
作者:
Koag MC;Papazian DM
The nature and magnitude of voltage sensor conformational changes during ion channel activation are controversial. We have analyzed the topology of the KVAP voltage sensor domain in the absence and presence of a hyperpolarized voltage using native, right-side out membrane vesicles from E. coli. This approach does not disrupt the normal membrane environment of the channel protein and does not involve detergent solubilization. We found that voltage-dependent conformational changes are focused in the N-terminal half of the KVAP S4 segment, in excellent agreement with results obtained with Shaker. Homologous residues in the KVAP and Shaker S4 segments are transferred from the extracellular to the intracellular compartment upon hyperpolarization. Taken together with X-ray structures indicating that the KVAP S4 segment is outwardly displaced at 0 mV compared to S4 in a mammalian Shaker channel, our results are consistent with the idea that S4 moves further during voltage-dependent activation in KVAP than in Shaker.
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