Molecule of the Month: Glucagon
Glucagon triggers the release of glucose into the blood, to power cells throughout the body
Dissecting a GPCR
Exploring the Structure
GLP-1 and Receptor (PDB entry 3iol)
The extracellular domain of the glucagon receptor has the job of finding glucagon. It binds to one end of the short hormone helix, leaving the other end free to insert into a deep pocket in the transmembrane domain, activating the receptor. The structure shown here (PDB entry 3iol ) shows the binding of GLP-1 to the extracellular domain of its receptor, which is quite similar to glucagon and its receptor. To explore this structure in more detail, click on the image for an interactive JSMol.
Topics for Further Discussion
- Several structures for isolated glucagon and modified forms of glucagon are available in the PDB, showing that it has a range of conformations in different environments. Try searching for "glucagon" to see a few of them.
- You can use the Protein Feature View to explore the different hormones created from proglucagon.
April 2015, David Goodselldoi:10.2210/rcsb_pdb/mom_2015_4