Delta-theraphotoxin-Hm1a - P60992 (TX1A_HETMC)


Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for P60992: 1
Gating modifier toxin that principally inhibits inactivation of the mammalian voltage-gated sodium channel Nav1.1/SCN1A. When tested against human Nav1.1/SCN1A-Nav1.8/SCN10A alpha subunits heterologously expressed in Xenopus oocytes, the toxin inhibits inactivation of Nav1.1 (EC(50)=38 nM), with substantially weaker effects on Nav1.2/SCN2A (EC(50)=236 nM) and Nav1.3/SCN3A (EC(50)=220 nM). The toxin inhibits several subtypes of voltage-gated potassium channels with significantly lower potency than its effects on Nav1.1/SCN1A (PubMed:27281198). It is a moderately potent blocker of Kv2.1/KCNB1, Kv2.2/KCNB2, Kv4.1/KCND1, Kv4.2/KCND2 and Kv4.3/KCND3 and has little effect on Kv1.1/KCNA1, Kv1.2/KCNA2, Kv1.3/KCNA3, Kv1.4/KCNA4, Kv1.5/KCNA5, Kv1.6/KCNA6 and Kv3.4/KCNC4 (PubMed:12065754). The binding affinity and subtype selectivity of the toxin is determined by residues within both the S1-S2 and S3-S4 loops of the domain IV voltage sensor (PubMed:27281198). Intracerebroventricular injection into mice elicits convulsions, spasms, tremors and rapid death (PubMed:12065754). When injected into mouse hindpaw, the toxin elicits an immediate and robust response to pain (PubMed:27281198). Intraplantar injection of toxin does not cause neurogenic inflammation or alter sensitivity to heat, indicative of a modality-specific effect on mechanosensitive neurons (PubMed:27281198). UniProt
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The presence of a 'disulfide through disulfide knot' structurally defines this protein as a knottin. UniProt
  • Organism: Togo starburst tarantula
  • Length:
  • UniProt
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