Tau-theraphotoxin-Hs1a - P0CH43 (DKTX_HAPSC)


Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for P0CH43: 3
Selectively activates the heat-activated TRPV1 channel. It binds to TRPV1 in an open state-dependent manner, trapping it there to produce irreversible currents (PubMed:20510930, PubMed:26880553, PubMed:27281200). It binds to the outer edge of the external pore of TRPV1 in a counterclockwise configuration, using a limited protein-protein interface and inserting hydrophobic residues into the bilayer (PubMed:26880553, PubMed:27281200). It also partitions naturally into membranes, with the two lobes exhibiting opposing energetics for membrane partitioning (K1) and channel activation (K2) (PubMed:26880553). In addition, the toxin disrupts a cluster of hydrophobic residues behind the selectivity filter that are critical for channel activation (PubMed:26880553). UniProt
Pathway Maps
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Subunit Structure
Interacts with TRPV1 (2 toxins (4 moieties) bind 1 channel (homotetramer)). UniProt
The presence of 'disulfide through disulfide knots' structurally defines this protein as a knottin. This toxin contains 2 'disulfide through disulfide knots' that are separated by a short linker. Bivalence accounts for irreversible toxin action. UniProt
  • Organism: Chinese bird spider
  • Length:
  • UniProt
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Data in yellow originates from Pfam  , by interacting with the HMMER3 web site  
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Data in orange originates from the SCOP   (version 1.75) and SCOPe   (version 2.04) classifications.
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  • Red: potentially disorderd region
  • Blue: probably ordered region.
Hydropathy has been calculated using a sliding window of 15 residues and summing up scores from standard hydrophobicity tables.
  • Red: hydrophobic
  • Blue: hydrophilic.
Data in lilac represent the genomic exon structure projected onto the UniProt sequence.
Data in blue originates from PDB
  • Secstruc: Secondary structure projected from representative PDB entries onto the UniProt sequence.
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The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).
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