MECDP_synthase (2-C-methyl-D-erythritol-2,4-cyclodiphosphate synthase), encoded by the ispF gene, catalyzes the formation of 2-C-methyl-D-erythritol 2,4-cyclodiphosphate (MEC) in the non-mevalonate deoxyxylulose (DOXP) pathway for isoprenoid biosynthesis. This pathway is present in bacteria, plants and some protozoa but is distinct from that used by mammals and Archaea. MECDP_synthase forms a homotrimer, carrying three active sites, each of which is formed in a cleft between pairs of subunits.
Jiyao W et al.(2023). "The conserved domain database in 2023.",