کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4350311 | 1615187 | 2006 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of tarantula toxin GsMTx4 on the membrane motor of outer hair cells
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موضوعات مرتبط
علوم زیستی و بیوفناوری
علم عصب شناسی
علوم اعصاب (عمومی)
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چکیده انگلیسی
GsMTx4, a cationic hydrophobic peptide isolated from tarantula venom, is a specific inhibitor of stretch-activated channels (SACs). Here, we show that the toxin also affects the membrane motor of outer hair cells at low doses. The membrane motor of outer hair cells is based on prestin, a member of the SLC26 family of membrane proteins, and directly uses electrical energy available at the plasma membrane. It is considered to be an essential part of the “cochlear amplifier,” which increases the sensitivity, tuning, and dynamic range of the mammalian ear. The toxin shifts the operating point of the motor. The saturating value of the voltage shift is (26 ± 1) mV, capable of significantly reducing the performance of the cochlear amplifier. The dissociation constant is (3.1 ± 0.6) μM, about five-fold higher than that for SACs.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Neuroscience Letters - Volume 404, Issues 1â2, 14 August 2006, Pages 213-216
Journal: Neuroscience Letters - Volume 404, Issues 1â2, 14 August 2006, Pages 213-216
نویسندگان
Jie Fang, K.H. Iwasa,