Lycopene β-cyclase (EC 5.5.1.19, CrtL, CrtL-b, CrtY) is an enzyme with systematic name carotenoid beta-end group lyase (decyclizing).
[1][2][3][4][5][6] This enzyme catalyses the following chemical reaction This enzyme requires NAD(P)H. It converts Lycopene (2 ψ ends) into β-carotene (2 β ends).