Basic phospholipase A2 homolog Tx-beta - G9I930 (PA2HB_MICTN)


Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for G9I930: 3
Heterodimer: snake venom phospholipase that potently activates mouse H(+)-gated sodium channel ASIC1/ACCN2 (acid-sensitive ion channel 1) expressed in Xenopus oocytes. Both alternatively spliced isoforms ASIC1a and ASIC1b are activated, with a higher potency for ASIC1a (EC(50)=9.4 nM) vs ASIC1b (EC(50)=23 nM). The ASIC3/ACCN3 subtype is also sensitive to the heterodimer, but with a lower potency (EC(50)=830 nM). On ASIC2a/ACCN1, the toxin shows a very weak activation, but produces a remarkable potentiation (>100-fold) of protons when the extracellular pH drops below neutrality. The toxin interacts with the extracellular region of the channel, since responses are only observed in the outside-out configuration. In vivo, the heterodimer elicits robust pain-related behavior in mice by activation of ASIC1/ACCN2 channels on capsaicin-sensitive nerve fibers. UniProt
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Subunit Structure
Heterodimer of an alpha and a beta chains. UniProt
  • Organism: Texas coral snake
  • Length:
  • UniProt
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