کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8395959 1544143 2014 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Jingzhaotoxin-35, a novel gating-modifier toxin targeting both Nav1.5 and Kv2.1 channels
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی بیوشیمی، ژنتیک و زیست شناسی مولکولی (عمومی)
پیش نمایش صفحه اول مقاله
Jingzhaotoxin-35, a novel gating-modifier toxin targeting both Nav1.5 and Kv2.1 channels
چکیده انگلیسی
Jingzhaotoxin-35 (JZTX-35), a 36-residue polypeptide, was purified from the venom of the Chinese tarantula Chilobrachys jingzhao. JZTX-35 inhibited Nav1.5 and Kv2.1 currents with the IC50 value of 1.07 μM and 3.62 μM, respectively, but showed no significant effect on either Na+ currents or Ca2+ currents evoked in hippocampal neurons. It shifted the activation of the Nav1.5 and Kv2.1 channels to more depolarized voltages, and markedly shifted the steady-state inactivation of Nav1.5 currents toward more hyperpolarized potentials. Moreover, JZTX-35 can bind to a close state of Nav1.5 and Kv2.1 channels. These results indicate that JZTX-35 is a new gating modifier toxin. JZTX-35 shares high sequence similarity with Jingzhaotoxins (JZTXs) targeting Nav1.5 or Kv2.1 channels, but they showed different ion channel selectivity. Structure-function analysis in this study would provide important clues for the exploration of ion channel selectivity of JZTXs.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Toxicon - Volume 92, 15 December 2014, Pages 90-96
نویسندگان
, , , , , ,