Semaglutide mastery course
Unit 3 of 12
Molecular engineering
Native GLP-1 is a poor drug: degraded in minutes and cleared almost as fast.
How a handful of changes turned GLP-1 into a once-weekly drug
Native GLP-1 is a poor drug: degraded in minutes and cleared almost as fast. Semaglutide is the product of deliberate molecular engineering that fixed both problems while keeping the receptor-activating sequence intact.
This unit walks the key modifications: two amino-acid substitutions (Aib8, which resists DPP-4, and Arg34, which leaves only one lysine to attach to), a fatty-acid chain that binds albumin, and the linker that attaches it at Lys26. It then shows what those changes did to the half-life and to oral delivery.