The chemical reactions and pathways resulting in the formation of PR-toxin, a bicyclic sesquiterpene belonging to the eremophilane class and acting as a mycotoxin.
The chemical reactions and pathways resulting in the formation of the phytochrome chromophore. The phytochrome chromophore is a linear tetrapyrrolic prosthetic group covalently attached to the large soluble protein phytochrome. Light absorption by the phytochrome chromophore triggers photoconversion between two spectrally distinct forms of the photoreceptor: Pr, the red light absorbing form, and Pfr, the far red light absorbing form.
Catalysis of the reaction: 2 3-acyl-sn-glycero-1-phospho-(1'-sn-glycerol) = 3-acyl-sn-glycero-1-phospho-(3'-acyl-1'-sn-glycerol) + sn-glycero-1-phospho-(1'-sn-glycerol).