啶二聚体来裂解二聚体。除了第二辅因子之外，光裂合酶也可根据序列相似性分为两种，第一种主要在革兰氏阴性菌、阳性菌、嗜盐古菌、真菌，和植物体内。Proteins containing this domain also include "Arabidopsis thaliana" s 1 and 2, which are blue light photoreceptors that mediate blue light-induced gene expression and modulation of cir