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Heteroscodratoxin-1

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Information on toxic effects of Heteroscodratoxin-1 in humans is not available. In mice, however, it has been found that intracerebroventricular injection of 500 pmol HmTx1 induces convulsions, spasms, tremors and death within 1 hour. At 100 pmol, a less severe response develops, although death still
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It is thought that heteroscodratoxin-1 modifies gating of specific potassium channels by shifting the activation threshold to more positive values. As a result larger depolarizations are needed to open channels. The mechanism underlying this modification has been largely elucidated using molecular
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1.1, as application of this toxin to a chimeric channel which contained these regions resulted in full toxin sensitivity (compared to other chimeric channels which contained only one of either of these regions). This, therefore, indicates that both the S1-S2 and the S3-S4 domains determine toxin
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1.1 channel activity by inhibiting fast and slow inactivation of the channel. Hm1a prevents the movement of the voltage sensor domain IV. Hm1a and Hm1b prevent the movement of the sensor domain towards the inner part of the cell thereby inhibiting fast inactivation of the
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Heteroscodratoxin-1 is a basic protein (isoelectric point of 7.7) composed of 35 amino acids with a carboxylated C-terminus. Its sequence shows strong similarity with other tarantula toxins such as scodratoxin,
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Shiau YS, Huang PT, Liou HH, Liaw YC, Shiau YY, Lou KL (October 2003). "Structural basis of binding and inhibition of novel tarantula toxins in mammalian voltage-dependent potassium channels".
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backbone that consists of three crossing disulfide bridges (Cys1-Cys4/Cys2-Cys5/Cys3-Cys6). Hm1a has the following amino acid sequence: ECRYLFGGCSSTSDCCKHLSCRSDWKYCAWDGTFS. Its
347:) serves as a binding site for Hmtx-1 forming both hydrophobic and hydrophilic bonds. Interaction between the toxin and the potassium channel induces a helical movement of S3 451:
Osteen, Jeremiah D.; Herzig, Volker; Gilchrist, John; Emrick, Joshua J.; Zhang, Chuchu; Wang, Xidao; Castro, Joel; Garcia-Caraballo, Sonia; Grundy, Luke (June 2016).
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2.1 potassium channel which is highly expressed in mammalian neurons and interacts strongly with heteroscodratoxin-1. In this model the C-terminal residue of the K
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Physiologically probably more important than its action on potassium channels is its action on the voltage-gated sodium channel Na
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1.1 channel by preventing a current reduction in the ion channel, but the underlying mechanism has not yet been elucidated.
1166: 810: 805: 2008: 925: 305:= 38 ± 6 nM). More specifically, it is thought that Hm1a targets the domain IV S3-S4 loop and the S1-S2 loop of Na 1215: 45: 999: 987: 791: 780: 518:"Pharmacology of the Nav1.1 domain IV voltage sensor reveals coupling between inactivation gating processes" 409:"Novel tarantula toxins for subtypes of voltage-dependent potassium channels in the Kv2 and Kv4 subfamilies" 110:(also known as κ-theraphototoxin-Hm1a, κ-TRTX-Hm1a, δ-theraphotoxin-Hm1a, δ-TRTX-Hm1a, Hm1a or HmTx1) is a 2018: 971: 729: 171: 1822: 1457: 818: 145: 116: 2013: 1009: 644: 464: 254:
4.3 conductance at a potential of 0 mV. No significant effect on other A-type rapidly inactivating (K
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resulting in limited spatial freedom of the S4-segment which is responsible for channel gating.
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Osteen, Jeremiah D.; Sampson, Kevin; Iyer, Vivek; Julius, David; Bosmans, Frank (2017-06-12).
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note: some toxins are produced by lower species and pass through intermediate species
1884: 1827: 1581: 1544: 1492: 1437: 1422: 1298: 1258: 1201: 995: 844: 767: 1947: 1937: 1920: 1889: 1837: 1801: 1760: 1714: 1651: 1554: 1477: 1412: 1247: 1243: 1239: 1225: 1039: 875: 672: 25: 453:"Selective spider toxins reveal a role for the Nav1.1 channel in mechanical pain" 1910: 1864: 1852: 1709: 1656: 1606: 1512: 1507: 1497: 1462: 1447: 1313: 981: 952: 772: 750: 687: 677: 95: 1942: 1879: 1796: 1774: 1719: 1682: 1626: 1596: 1586: 1527: 1517: 1502: 1487: 1482: 1467: 1387: 1372: 1288: 1278: 1273: 1263: 1230: 920: 880: 697: 692: 167: 111: 61: 543: 484: 378:"Kappa-theraphotoxin-Hm1a - Heteroscodra maculata (Togo starburst tarantula)" 1847: 1842: 1832: 1812: 1755: 1745: 1740: 1699: 1611: 1427: 1407: 1397: 1357: 1352: 1332: 1303: 1253: 1235: 1188: 1180: 1087: 1071: 682: 534: 231: 163: 150: 121: 30:
Schematic diagram of the three-dimensional structure of Heteroscodratoxin-1.
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Escoubas P, Diochot S, Célérier ML, Nakajima T, Lazdunski M (July 2002).
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Heteroscodratoxin-1 inhibits subtypes of both delayed rectifier (
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1.1 channel. Hm1a also inhibits the slow inactivation of the Na
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LQT1), or on sodium and calcium channels has been observed.
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Heteroscodratoxin-1 can be obtained from venom glands of
170:-1 family of inhibitory spider peptides based on its 1903: 1810: 1784: 1773: 1728: 1670: 1564: 1553: 1322: 1179: 1150: 1086: 1023: 970: 943: 896: 862: 835: 748: 739: 728: 719: 708: 230:. At a concentration of 100-300 nM, in transfected 166:and SGTx1. Structurally the protein belongs to the 91: 81: 76: 60: 52: 40: 35: 18: 522:Proceedings of the National Academy of Sciences 262:3.4) or delayed rectifier potassium channels (K 402: 400: 398: 396: 394: 645: 626:from the Toxin, Toxin-target database website 8: 1781: 1561: 868: 745: 736: 725: 716: 652: 638: 630: 124:) that shifts the activation threshold of 73: 1577:Androctonus australis hector insect toxin 551: 533: 492: 369: 15: 7: 446: 444: 442: 202:) and A-type rapidly inactivating ( 931:Staphylococcal Enterotoxin B (SEB) 624:Toxin card for Heteroscodratoxin-1 153:or Togo starburst baboon spider). 14: 1983: 1982: 228:voltage-gated potassium channels 126:voltage-gated potassium channels 114:produced by the venom glands of 24: 1015:Extracellular adenylate cyclase 577:Chemical Research in Toxicology 1: 1167:Fibronectin binding protein A 310:sensitivity and selectivity. 135:to more positive potentials. 335:docking simulation for the K 908:Staphylococcus aureus alpha 886:Panton–Valentine leukocidin 2035: 926:Toxic shock syndrome toxin 1978: 1965: 1823:(+)-Allopumiliotoxin 267A 871: 380:. Uniprot.org. 2011-09-21 72: 23: 1216:beta-Nitropropionic acid 128:and the inactivation of 1000:Heat-labile enterotoxin 991:heat-stable enterotoxin 535:10.1073/pnas.1621263114 1109:Bacillus thuringiensis 413:Molecular Pharmacology 360:occurs after 2 hours. 178:is 3,995.61 Da. 146:Heteroscodra maculata 117:Heteroscodra maculata 46:Heteroscodra maculata 1010:Pseudomonas exotoxin 313:Hm1a enhances the Na 614:Heteroscodratoxin-1 477:10.1038/nature17976 469:2016Natur.534..494O 425:10.1124/mol.62.1.48 108:Heteroscodratoxin-1 19:Heteroscodratoxin-1 2009:Ion channel toxins 1926:Alpha-Bungarotoxin 1096:Lipopolysaccharide 1054:Pore-forming toxin 343:2.1 S3-segment (S3 234:it blocks 23% of K 1996: 1995: 1961: 1960: 1931:Beta-Bungarotoxin 1875:Pumiliotoxin 251D 1769: 1768: 1175: 1174: 1162:Clumping factor A 1082: 1081: 966: 965: 939: 938: 858: 857: 589:10.1021/tx0341097 528:(26): 6836–6841. 463:(7608): 494–499. 250:4.2, and 43% of K 105: 104: 101: 100: 2026: 1986: 1985: 1914: 1870:Histrionicotoxin 1816: 1790: 1782: 1734: 1688:Alpha-latrotoxin 1676: 1570: 1562: 1294:Sterigmatocystin 1246:, Fumonisin B3, 1210:epsilon-amanitin 1129:B. thuringiensis 958:Diphtheria toxin 901: 869: 838: 754: 746: 737: 726: 717: 654: 647: 640: 631: 601: 600: 572: 566: 565: 555: 537: 513: 507: 506: 496: 448: 437: 436: 404: 389: 388: 386: 385: 374: 176:molecular weight 149:(Togo starburst 120:(Togo starburst 74: 48: 28: 16: 2034: 2033: 2029: 2028: 2027: 2025: 2024: 2023: 1999: 1998: 1997: 1992: 1974: 1957: 1953:Cardiotoxin III 1909: 1904: 1899: 1811: 1806: 1785: 1777: 1765: 1729: 1724: 1671: 1666: 1565: 1557: 1549: 1453:Resiniferatoxin 1318: 1171: 1153: 1146: 1111:delta endotoxin 1078: 1019: 1005:Pertussis toxin 973: 962: 935: 897: 892: 854: 850:Listeriolysin O 836: 831: 749: 731: 711: 704: 658: 610: 605: 604: 583:(10): 1217–25. 574: 573: 569: 515: 514: 510: 450: 449: 440: 406: 405: 392: 383: 381: 376: 375: 371: 366: 357: 350: 346: 342: 338: 332: 325: 321: 316: 308: 300: 293: 289: 285: 281: 277: 273: 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959: 956: 954: 951: 950: 948: 946: 942: 932: 929: 927: 924: 922: 919: 917: 913: 909: 906: 905: 903: 900: 895: 887: 884: 883: 882: 879: 877: 874: 873: 870: 867: 865: 861: 851: 848: 846: 845:Anthrax toxin 843: 842: 840: 834: 826: 823: 822: 821: 820: 816: 812: 809: 807: 804: 803: 802: 801: 797: 793: 790: 788: 785: 784: 783: 782: 778: 774: 771: 769: 768:Tetanospasmin 766: 765: 764: 763: 759: 758: 756: 752: 747: 744: 742: 738: 735: 733: 727: 724: 722: 718: 715: 713: 707: 699: 696: 694: 691: 689: 686: 684: 681: 679: 676: 674: 671: 669: 666: 665: 664: 661: 660: 655: 650: 648: 643: 641: 636: 635: 632: 625: 622: 619: 615: 612: 611: 607: 598: 594: 590: 586: 582: 578: 571: 568: 563: 559: 554: 549: 545: 541: 536: 531: 527: 523: 519: 512: 509: 504: 500: 495: 490: 486: 482: 478: 474: 470: 466: 462: 458: 454: 447: 445: 443: 439: 434: 430: 426: 422: 418: 414: 410: 403: 401: 399: 397: 395: 391: 379: 373: 370: 363: 361: 354: 352: 329: 327: 311: 304: 295: 246:4.1, 39% of K 242:2.2, 50% of K 238:2.1, 19% of K 233: 229: 225: 217: 209: 201: 193: 181: 179: 177: 173: 169: 165: 156: 154: 152: 148: 147: 138: 136: 134: 131: 127: 123: 119: 118: 113: 109: 97: 94: 90: 87: 84: 80: 75: 71: 68: 65: 63: 59: 55: 51: 47: 43: 39: 34: 27: 22: 17: 1969: 1948:Calcicludine 1938:Calciseptine 1921:Bungarotoxin 1890:Tarichatoxin 1838:Arenobufagin 1802:Tetrodotoxin 1761:Tetrodotoxin 1715:Vanillotoxin 1652:Phaiodotoxin 1555:Invertebrate 1478:Solasodamine 1413:Lotaustralin 1248:Fumonisin B4 1244:Fumonisin B2 1240:Fumonisin B1 1226:Cytochalasin 1128: 1108: 1060: 1046: 1040:Superantigen 1032: 988: 876:Streptolysin 817: 798: 779: 760: 580: 576: 570: 525: 521: 511: 460: 456: 419:(1): 48–57. 416: 412: 382:. Retrieved 372: 358: 333: 312: 296: 185: 160: 144: 142: 115: 107: 106: 2014:Neurotoxins 1911:Snake venom 1865:Epibatidine 1853:Cinobufagin 1710:Stromatoxin 1657:Imperatoxin 1607:Scyllatoxin 1513:Tagetitoxin 1508:Swainsonine 1498:Solauricine 1463:Solamargine 1458:Scopolamine 1448:Retronecine 1314:Zearalenone 982:Shiga toxin 953:Cord factor 792:Enterotoxin 787:Alpha toxin 781:perfringens 773:Tetanolysin 751:Clostridium 688:hepatotoxin 678:enterotoxin 668:cardiotoxin 86:Swiss-model 36:Identifiers 2003:Categories 1943:Taicatoxin 1880:Samandarin 1833:Bufotoxins 1797:Ciguatoxin 1775:Vertebrate 1720:Huwentoxin 1700:Cupiennins 1683:Latrotoxin 1627:Kaliotoxin 1597:Margatoxin 1587:Maurotoxin 1528:Toxalbumin 1518:Tinyatoxin 1503:Strychnine 1488:Solasonine 1483:Solasodine 1468:Solanidine 1388:Falcarinol 1373:Delphinine 1289:Phalloidin 1279:Ochratoxin 1274:Orellanine 1264:Lolitrem B 1231:Ergotamine 1181:Mycotoxins 1025:Mechanisms 984:/Verotoxin 921:Exfoliatin 881:Leukocidin 698:phototoxin 693:neurotoxin 384:2011-10-08 364:References 168:huwentoxin 112:neurotoxin 82:Structures 77:Search for 1848:Bufotenin 1843:Bufotalin 1813:Amphibian 1756:Saxitoxin 1746:Eledoisin 1741:Conotoxin 1612:Hefutoxin 1428:Oleandrin 1408:Linamarin 1398:Helenalin 1358:Cicutoxin 1353:Chaconine 1333:Amygdalin 1304:Vomitoxin 1254:Gliotoxin 1236:Fumonisin 1189:Aflatoxin 1152:Virulence 1088:Endotoxin 819:botulinum 800:difficile 710:Bacterial 683:hemotoxin 673:cytotoxin 616:from the 544:0027-8424 485:0028-0836 290:1.5, or K 258:1.4 and K 232:COS cells 164:hanatoxin 157:Chemistry 151:tarantula 122:tarantula 1988:Category 1751:Onchidal 1731:Mollusca 1642:Bestoxin 1637:Birtoxin 1602:Slotoxin 1592:Agitoxin 1567:Scorpion 1523:Tomatine 1473:Solanine 1418:Mimosine 1393:Gossypol 1378:Divicine 1343:Antiarin 1338:Anisatin 1269:Muscimol 1221:Citrinin 1194:Amatoxin 1140:Cry34Ab1 1068:AB toxin 1062:type III 974:negative 732:positive 721:Exotoxin 597:14565763 562:28607094 503:27281198 433:12065754 355:Toxicity 96:InterPro 41:Organism 1906:Reptile 1368:Daphnin 1363:Coniine 1348:Brucine 1309:Zeranol 1284:Patulin 1131:toxins 1121:Cry3Bb1 1101:Lipid A 1048:type II 989:E. coli 741:Bacilli 620:website 618:Uniprot 553:5495237 494:4919188 465:Bibcode 172:knottin 139:Sources 92:Domains 62:UniProt 1778:toxins 1673:Spider 1647:BmKAEP 1617:HgeTx1 1558:toxins 1433:Persin 1326:toxins 1154:factor 1135:Cry6Aa 1127:Other 1116:Cry1Ac 1034:type I 837:Other: 762:tetani 712:toxins 663:Toxins 595:  560:  550:  542:  501:  491:  483:  457:Nature 431:  286:1.2/ K 282:1.6, K 278:1.5, K 274:1.3, K 270:1.2, K 266:1.1, K 182:Target 130:Nav1.1 67:P60992 53:Symbol 1705:PhTx3 1622:HsTx1 1545:Tutin 1538:Ricin 1533:Abrin 1403:Ledol 1324:Plant 916:delta 864:Cocci 825:Botox 301:1.1 ( 1787:Fish 1695:CSTX 972:Gram 912:beta 730:Gram 593:PMID 558:PMID 540:ISSN 499:PMID 481:ISSN 429:PMID 303:EC50 218:and 194:and 1662:Pi3 1632:Lq2 1072:AB5 585:doi 548:PMC 530:doi 526:114 489:PMC 473:doi 461:534 421:doi 224:4.3 216:4.2 208:4.1 200:2.2 192:2.1 56:N/A 2005:: 1242:, 1208:, 1204:, 1200:, 591:. 581:16 579:. 556:. 546:. 538:. 524:. 520:. 497:. 487:. 479:. 471:. 459:. 455:. 441:^ 427:. 417:62 415:. 411:. 393:^ 318:Na 226:) 210:, 1913:: 1908:/ 1815:: 1789:: 1733:: 1675:: 1569:: 1250:) 1238:( 1212:) 1196:( 1070:/ 998:/ 914:/ 910:/ 811:B 806:A 753:: 653:e 646:t 639:v 599:. 587:: 564:. 532:: 505:. 475:: 467:: 435:. 423:: 387:. 349:C 345:C 341:V 337:V 324:v 320:v 315:v 307:v 299:v 292:V 288:V 284:V 280:V 276:V 272:V 268:V 264:V 260:V 256:V 252:V 248:V 244:V 240:V 236:V 222:V 220:K 214:V 212:K 206:V 204:K 198:V 196:K 190:V 188:K

Index


Heteroscodra maculata
UniProt
P60992
Swiss-model
InterPro
neurotoxin
Heteroscodra maculata
tarantula
voltage-gated potassium channels
Nav1.1
sodium channels
Heteroscodra maculata
tarantula
hanatoxin
huwentoxin
knottin
molecular weight
KV2.1
KV2.2
KV4.1
KV4.2
KV4.3
voltage-gated potassium channels
COS cells
EC50
"Kappa-theraphotoxin-Hm1a - Heteroscodra maculata (Togo starburst tarantula)"


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