Lyase
Lyase
Lyase (pronunciation: /ˈlaɪ.eɪz/) is a class of enzymes that catalyze the breaking of various chemical bonds by means other than hydrolysis and oxidation, often forming a new double bond or a new ring structure.
Etymology
The term "Lyase" comes from the Greek word "λύσις" (lýsis), meaning "loosening" or "to unbind".
Function
Lyases differ from other enzymes in that they require only one substrate for the reaction in one direction, but two substrates for the reverse reaction. They are characterized by the fact that they can form a double bond in a substrate, and are involved in metabolism and DNA repair.
Classification
Lyases are classified by the type of reaction they catalyze. The six main subclasses include:
- EC 4.1: Carbon-Carbon Lyases
- EC 4.2: Carbon-Oxygen Lyases
- EC 4.3: Carbon-Nitrogen Lyases
- EC 4.4: Carbon-Sulfur Lyases
- EC 4.5: Carbon-Halide Lyases
- EC 4.6: Phosphorus-Oxygen Lyases
Related Terms
External links
- Medical encyclopedia article on Lyase
- Wikipedia's article - Lyase
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