Venom-derived peptides inhibiting Kir channels: Past, present, and future

Area of Science:

• Ion channel research
• Venom-derived peptides
• Pharmacology

Background:

• Inwardly rectifying K+ (Kir) channels are vital for membrane transport and excitability in vertebrates and invertebrates.
• Few potent and selective venom toxins targeting Kir channels have been identified compared to other K+ channel families.

Observation:

• The limited discovery of Kir channel toxins may stem from evolutionary pressures or a lack of focused screening.
• Screening efforts have identified three venom peptides with inhibitory activity against mammalian Kir channels.
• Tertiapin, a potent pore blocker from European honey bee venom (Apis mellifera), is a key example.

Findings:

• Venomics and computational approaches offer new avenues for venom peptide discovery.
• Re-engineering existing peptide scaffolds, such as tertiapin, can expand the range of Kir channel blockers.

Implications:

• Expanding the toolkit of selective Kir channel blockers is essential for future research.
• These blockers hold potential for developing novel therapeutics.
• This work contributes to understanding venom evolution and peptide-based drug development.