Denatured proteins = useless ?

In biology, i learnt that enzymes have this thing called a lock-and-key hypothesis and that it is very specific. So if i eat a denatured protein, wont the structure be the different causing that specific enzyme its meant for to be unable to recognize it ?

Digestive enzymes will recognize specific amino acid linkages on the protein, regardless of shape. For example, the enzyme trypsin is specific for the amino acids lysine and arginine and will only cleave those amino acid linkages. Shape doesn't matter.