SNX-482: A Novel Class E Calcium Channel Antagonist from Tarantula Venom
نویسندگان
چکیده
منابع مشابه
Inhibition of A-type potassium current by the peptide toxin SNX-482.
SNX-482, a peptide toxin isolated from tarantula venom, has become widely used as an inhibitor of Cav2.3 voltage-gated calcium channels. Unexpectedly, we found that SNX-482 dramatically reduced the A-type potassium current in acutely dissociated dopamine neurons from mouse substantia nigra pars compacta. The inhibition persisted when calcium was replaced by cobalt, showing that it was not secon...
متن کاملAn inhibitor of the Kv2.1 potassium channel isolated from the venom of a Chilean tarantula
The Kv2.1 voltage-activated K+ channel, a Shab-related K+ channel isolated from rat brain, is insensitive to previously identified peptide inhibitors. We have isolated two peptides from the venom of a Chilean tarantula, G. spatulata, that inhibit the Kv2.1 K+ channel. The two peptides, hanatoxin1 (HaTx1) and hanatoxin2 (HaTx2) are unrelated in primary sequence to other K+ channel inhibitors. Th...
متن کاملSynthesis and Effects of Novel Dihydropyridines as Dual Calcium Channel Blocker and Angiotensin Antagonist on Isolated Rat Aorta
Objective(s) Four novel losartan analogues 5a-d were synthesized by connecting a dihydropyridine nucleus to imidazole ring. The effects of 5a and 5b on angiotensin receptors (AT') and L-type calcium channels were investigated on isolated rat aorta. Materials and Methods Aortic rings were pre-contracted with 1 pM Angiotensin II or 80 mM KCl and relaxant effects of losartan, nifedipine, 5a and...
متن کاملo-Agatoxins: Novel Calcium Channel Antagonists of Two Subtypes from Funnel Web Spider (Agelenopsis uperta) Venom*
A new series of polypeptide presynaptic antagonists (((w-agatoxins”) was purified from venom of the funnel web spider Agelenopsis aperta. Physiological data indicate that all of these peptides are antagonists of voltage-sensitive calcium channels. Although all three w-agatoxins (Aga) described here (w-Aga-IA, w-AgaIB, and w-Aga-IIA) block insect neuromuscular transmission presynaptically, bioch...
متن کاملCharacterization of cDNA sequence encoding for a novel sodium channel -toxin from the Iranian scorpion Mesobuthus eupeus venom glands
The venoms of Buthidae scorpions are known to contain basic, single-chain protein -toxins consisting of 60-70 amino acid residues that are tightly cross-linked by four disulfide bridges. Total RNA was extracted from the venom glands of scorpion Mesobuthus eupeus collected from the Khuzestan province of Iran and then cDNA was synthesized with the modified oligo (dT) primer and extracted total R...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: CNS Drug Reviews
سال: 2006
ISSN: 1080-563X
DOI: 10.1111/j.1527-3458.2000.tb00143.x