A cyclase is an enzyme, almost always a lyase, that catalyzes a chemical reaction to form a cyclic compound. Important cyclase enzymes include:
- Adenylyl cyclase, which forms cyclic AMP from adenosine triphosphate (EC 4.6.1.1)
- ADCY1
- ADCY2
- ADCY3
- ADCY4
- ADCY5
- ADCY6
- ADCY7
- ADCY8
- ADCY9
- ADCY10
- Guanylyl cyclase, which forms cyclic GMP from guanosine triphosphate (EC 4.6.1.2)
- GUCY1A2
- GUCY1A3
- GUCY1B3
- Guanylate cyclase 2C
- Guanylate cyclase 2D
- Guanylate cyclase 2F
- NPR1
- NPR2
- Protein cyclase, a ligase enzyme that produces backbone-cyclised proteins by intramolecular transpeptidation