2.5.1.129 | in complex with substrate, to 1.4 A resolution. The active site environment is dominated by pi systems, which assist phosphate-C19 bond breakage following FMN reduction, leading to formation of the N5-C19 bond. UbiX then acts as a chaperone for adduct reorientation, via transient carbocation species, leading ultimately to formation of the dimethylallyl C39-C6 bond |