This was the first known enzyme to take its instructions from a DNA copy.

GPx4 is the only known enzyme that efficiently reduces lipid-hydroperoxides within biological membranes.

S-adenosylhomocysteine hydrolase is the only known enzyme capable of SAH hydrolysis.

There are at least 22 known enzymes that are active during fermentation of wine.

However, myrosinase is the only known enzyme found in nature that can cleave a thio-linked glucose.

Enzymes : There are more than 700 known enzymes.

These structurally distinct enzyme forms have been shown to exist in several known allosteric enzymes.

Background Two known enzymes catabolize the essential amino acid tryptophan in mammals.

Photosystem II is the only known biological enzyme that carries out this oxidation of water.

In more complex mammals, there are seven known enzymes that act in cellular regulation, as sir2 does in yeast.