Structure
Structurally the major basic protein (MBP) is similar to lectins (sugar-binding proteins), and has a fold similar to that seen in C-type lectins. However, unlike other C-type lectins (those that bind various carbohydrates in the presence of calcium), MBP does not bind either calcium or any of the other carbohydrates that this family recognize.
Instead, MBP recognises heparan sulfate proteoglycans. Two crystallographic structures of MBP have been determined.
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