iberiotoxin   Click here for help

GtoPdb Ligand ID: 4218

Synonyms: IbTX
Immunopharmacology Ligand
Compound class: Peptide or derivative
Comment: From the venom gland of Mesobuthus tamulus (Eastern Indian scorpion). Iberiotoxin is selective for KCa1.1 channels that associate with β1, β2 and β3 regulatory subunits [1-3]. In contrast the KCa1.1 channels containing the β4 subunit that are found predominantly in the central nervous system are resistant to iberiotoxin inhibition [6]

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2D Structure
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2D Structure

An image of the ligand's 2D structure. For small molecules with SMILES these are drawn using the NCI/CADD Chemical Identifier Resolver. Click on the image to access the chemical structure search tool with the ligand pre-loaded in the structure editor. For other types of ligands, e.g. longer nucleotides and peptides, a manually drawn representation of the molecule may be provided.

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SMILES / InChI / InChIKey
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SMILES / InChI / InChIKey

SMILES (Simplified Molecular Input Line Entry Specification) A specification for unambiguously describing the structure of chemical molecules using short ASCII strings. Canonical SMILES specify a unique representation of the 2D structure without chiral or isotopic specifications. Isomeric SMILES include chiral specification and isotopes.

Standard InChI (IUPAC International Chemical Identifier) and InChIKey InChI is a non-proprietary, standard, textual identifier for chemical substances designed to facilitate linking of information and database searching. An InChIKey is a simplified version of a full InChI, designed for easier web searching.

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Canonical SMILES NCCCCC1NC(=O)C(CSSCC(NC(=O)C(CCCCN)NC(=O)CNC(=O)C(CCCNC(=N)N)NC(=O)C(NC(=O)C(NC(=O)CNC(=O)C(NC(=O)C(NC(=O)C(NC1=O)CC(=O)O)CC(C)C)Cc1ccccc1)C(C)C)CC(=O)O)C(=O)NC(C(=O)NCC(=O)NC(C(=O)NC(C(=O)NC1CSSCC(NC(=O)C(NC1=O)CCCNC(=N)N)C(=O)NC(C(=O)NC(C(=O)O)CCC(=O)N)Cc1ccc(cc1)O)CCCCN)CCCCN)CCSC)NC(=O)C(C(C)C)NC(=O)C(NC(=O)C(Cc1c[nH]c2c1cccc2)NC(=O)C1CSSCC(NC(=O)C(NC(=O)C(C(C)C)NC(=O)C(NC(=O)C(C(O)C)NC(=O)C(NC(=O)C2CCC(=O)N2)Cc2ccccc2)CC(=O)O)CC(=O)O)C(=O)NC(CO)C(=O)NC(C(=O)NC(C(=O)NC(C(=O)NC(C(=O)N1)CCC(=O)O)CCCCN)CO)C(C)C)CO
Isomeric SMILES NCCCCC1NC(=O)C(CSSCC(NC(=O)C(CCCCN)NC(=O)CNC(=O)C(CCCNC(=N)N)NC(=O)C(NC(=O)C(NC(=O)CNC(=O)C(NC(=O)C(NC(=O)C(NC1=O)CC(=O)O)CC(C)C)Cc1ccccc1)C(C)C)CC(=O)O)C(=O)NC(C(=O)NCC(=O)NC(C(=O)NC(C(=O)NC1CSSCC(NC(=O)C(NC1=O)CCCNC(=N)N)C(=O)NC(C(=O)NC(C(=O)O)CCC(=O)N)Cc1ccc(cc1)O)CCCCN)CCCCN)CCSC)NC(=O)C(C(C)C)NC(=O)C(NC(=O)C(Cc1c[nH]c2c1cccc2)NC(=O)C1CSSCC(NC(=O)C(NC(=O)C(C(C)C)NC(=O)C(NC(=O)C(C(O)C)NC(=O)C(NC(=O)C2CCC(=O)N2)Cc2ccccc2)CC(=O)O)CC(=O)O)C(=O)NC(CO)C(=O)NC(C(=O)NC(C(=O)NC(C(=O)NC(C(=O)N1)CCC(=O)O)CCCCN)CO)C(C)C)CO
InChI InChI=1S/C179H274N50O55S7/c1-87(2)65-111-155(261)208-112(66-93-33-15-13-16-34-93)146(252)195-77-133(239)225-139(88(3)4)172(278)213-117(71-136(244)245)158(264)199-100(44-31-62-190-178(186)187)144(250)193-75-131(237)198-102(40-22-27-58-181)148(254)219-124(167(273)205-109(56-64-285-12)145(251)194-76-132(238)197-101(39-21-26-57-180)147(253)200-105(43-25-30-61-184)151(257)220-123-81-286-288-83-125(221-152(258)106(203-166(123)272)45-32-63-191-179(188)189)169(275)210-113(68-95-46-48-97(234)49-47-95)156(262)206-110(177(283)284)50-53-129(185)235)82-287-291-86-128(168(274)202-104(42-24-29-60-183)150(256)212-116(70-135(242)243)159(265)207-111)224-175(281)142(91(9)10)228-164(270)121(79-231)216-157(263)115(69-96-74-192-99-38-20-19-37-98(96)99)211-170(276)126-84-289-290-85-127(171(277)217-122(80-232)165(271)227-141(90(7)8)174(280)218-120(78-230)163(269)201-103(41-23-28-59-182)149(255)204-108(154(260)222-126)52-55-134(240)241)223-160(266)118(72-137(246)247)214-173(279)140(89(5)6)226-162(268)119(73-138(248)249)215-176(282)143(92(11)233)229-161(267)114(67-94-35-17-14-18-36-94)209-153(259)107-51-54-130(236)196-107/h13-20,33-38,46-49,74,87-92,100-128,139-143,192,230-234H,21-32,39-45,50-73,75-86,180-184H2,1-12H3,(H2,185,235)(H,193,250)(H,194,251)(H,195,252)(H,196,236)(H,197,238)(H,198,237)(H,199,264)(H,200,253)(H,201,269)(H,202,274)(H,203,272)(H,204,255)(H,205,273)(H,206,262)(H,207,265)(H,208,261)(H,209,259)(H,210,275)(H,211,276)(H,212,256)(H,213,278)(H,214,279)(H,215,282)(H,216,263)(H,217,277)(H,218,280)(H,219,254)(H,220,257)(H,221,258)(H,222,260)(H,223,266)(H,224,281)(H,225,239)(H,226,268)(H,227,271)(H,228,270)(H,229,267)(H,240,241)(H,242,243)(H,244,245)(H,246,247)(H,248,249)(H,283,284)(H4,186,187,190)(H4,188,189,191)
InChI Key VDNVVLOBNHIMQA-UHFFFAOYSA-N
Immunopharmacology Comments
Iberiotoxin is somewhat selective for KCa1.1 channels that associate with β3b regulatory subunits that are expressed by invasive RA fibroblast-like synoviocytes [4], a cell-type involved in rheumatoid arthritis (RA) progression [5]. This selectivity should spare the CNS KCa1.1 β4 channels, and limit the CNS side-effects associated with non-selective inhibitors like paxilline. Efficacy of iberiotoxin-mediated KCa1.1 channel blockade on fibroblast-like synoviocytes in rodent models of RA suggests this molecular mechanism as a novel approach for the development of RA therapeutucs [5].