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Purpose of Receptor
Structure
Conformational Changes
How Insulin Binds
The insulin receptor unit has four separate sites for the insulin molecule to bind to. There are two pairs of two identical binding sites referred to as 1 and 1' and then 2 and 2'. The insulin molecules bind to these sites mostly through hydrophobic interactions. Despite a majority of the interactions being similar, sites 1 and 1' have a higher binding affinity than sites 2 and 2' due to site one having a larger surface area (706 square angstroms) exposed for insulin to bind to compared to site 2 (394 square angstroms)[3]
