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3

There is a recent crystal structure of a bromelain precursor protein. PDB Entry 6U7D http://www.rcsb.org/structure/6U7D Usually "precursor" means that the active form of the protein is formed by cleaving off a piece or pieces. I do not know if that is the case for this protein. However the protein used to grow these crystals was expressed in E. coli, so ...


6

I think I got it. The diagram in PubChem is not bromelain molecule, but a tiny fragment of it. This thing is indeed too small to be an enzyme. Also, it has nothing to do with proteins. Look at the formula, there is not a single amino acid residue here. Indeed, scroll down to 3.4.2 and read: "carbohydrate moiety of bromelain". That's what it is, and not the ...


4

I was forced to look at the wikipedia entry for enzyme, which states: Enzymes /ˈɛnzaɪmz/ are macromolecular biological catalysts that accelerate chemical reactions. [...] Most enzymes are proteins, although a few are catalytic RNA molecules. The latter are called ribozymes. [Enzymes' specificity comes from their unique three-dimensional structures.] The ...


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