Cospin
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Cospin is a serine protease inhibitor from the mushroom species Coprinopsis cinerea in the phylum Basidiomycota. (Cospin is a protein found in the mushroom Coprinopsis cinerea that helps block the activity of certain enzymes called serine proteases).
It has similar biochemical properties to other well characterized fungal serine protease inhibitors of family I66 in the MEROPS classification.(Cospin is similar to other proteins in fungi that do the same job and belong to a group known as family I66 in the MEROPS classification system)[1][2][3][4] Cospin is one of the few serine protease inhibitors of basidiomycete that have been isolated and characterized.[5] It is highly expressed in sexual reproductive structures termed fruiting bodies and has been cloned and characterized at the molecular and functional levels. (It is found in high amounts in the mushroom's fruiting bodies, which are its reproductive structures. Scientists have studied cospin at both the genetic and functional levels to understand how it works).