Example 5 Arg34GLP-1 (9-37) carries out the modification of terminal amino group: dissolving 1g of Boc-His (Trt) -Aib-OH in 10mL of dichloromethane, adding 0.37g of DCC, cooling to 0 , stirring for 30min, adding 0.22g of HOSu, stirring and reacting at the temperature for 12 hours, filtering, collecting filtrate, and spin-drying the filtrate to obtain a crude Boc-His (Trt) -Aib-OSu product
This variant incorporates an 18-carbon hydrophobic fatty acid side chain (1,18-octadecanedioic acid) to bind the peptide to albumin, which is akin to attaching a house to GLP-1, says chemist Krishna Kumar from Tufts University in Massachusetts, US
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We are working on the hybrid synthesis, where we make some [peptide] pieces with SPPS and then we will couple [them] together with an enzyme. So far they have done this for liraglutide using a unique ligation point the site where the enzyme couples two natural amino acids