This model represents a group of geranylgeranyl reductases specific for the biosyntheses of bacteriochlorophyll and chlorophyll. It is unclear whether the processes of isoprenoid ligation to the chlorin ring and reduction of the geranylgeranyl chain to a phytyl chain are necessarily ordered the same way in all species. [Biosynthesis of cofactors, prosthetic groups, and carriers, Chlorophyll and bacteriochlorphyll]
Jiyao W et al.(2023). "The conserved domain database in 2023.",