The non-mevalonate pathway is a sequence of enzyme-catalyzed reactions that forms the five-carbon isoprenoid precursors isopentenyl diphosphate and dimethylallyl diphosphate from pyruvate and glyceraldehyde 3-phosphate. It is also termed the methylerythritol phosphate pathway and occurs in many bacteria and in the plastids of plants and several other eukaryotic lineages ^[1]. The pathway begins with formation of 1-deoxy-D-xylulose 5-phosphate, followed by reductive rearrangement to 2-C-methyl-D-erythritol 4-phosphate. Subsequent cytidylylation, phosphorylation, cyclization, and reductive transformations generate the terminal diphosphate products ^[2]. Its final two enzymes contain iron–sulfur clusters and require electron transfer for catalysis ^[3]. Pathway flux depends on precursor supply, enzyme activity, energy availability, and reducing equivalents ^[4]. The resulting activated five-carbon units participate in downstream chain elongation and the formation of structurally diverse isoprenoid molecules ^[1][2].