What is "imperatoxin"

Imperatoxin I (IpTx) is a peptide toxin derived from the venom of the African scorpion Pandinus imperator.

There are two subtypes of this toxin:

• Imperatoxin A (activator): a peptide toxin which enhances the influx of Ca from the sarcoplasmatic reticulum into the cell.
• Imperatoxin I (inhibitor): a peptide toxin which decreases the influx of Ca from the sarcoplasmatic reticulum into the cell.