Computer-designed proteins block cobra-family venom toxins in mice

The problem

Snakebite kills tens of thousands of people a year, mostly in rural parts of Africa and Asia. Antivenoms are still made by immunising horses or sheep with venom and purifying their antibodies. They are expensive, need cold storage, can cause allergic reactions, and each works only against certain species.

Many of the deadliest snakes, such as cobras, mambas and kraits, are elapids. Their venoms rely heavily on three-finger toxins, small proteins named for their shape, which block nerve signals to muscles or damage cells.

The design

The team used the RFdiffusion family of design tools to invent small proteins that grip the toxins at the spot they use to attack the body. They designed binders for short-chain and long-chain neurotoxins and for cytotoxins, then improved the best ones in the lab.

In mice given lethal doses of neurotoxin, the top designs protected 80 to 100 percent of the animals, including when given 15 minutes after the toxin. The binders were also stable at high temperatures, which matters where cold storage is scarce.

What is missing

The work targets purified toxins, not whole venoms, and the cytotoxin binder did less well. A practical product would combine several designs to cover a venom mix, then go through safety and efficacy trials. The authors describe it as a starting point; the bigger news is how quickly design produced working binders at all.

Source Vázquez Torres S. et al., Nature, January 2025

Amino Weekly reports research. It is not medical advice and never gives doses.