Fig. 2
From: Bio-production of gaseous alkenes: ethylene, isoprene, isobutene
Pathways from glycolytic and citric acid cycle products to isoprene, ethylene, and isobutene. HMG-CoA, 3-hydroxy-3-methylglutaryl-CoA; P5C, l-delta 1-pyrroline-5-carboxylate; ispD, 4-diphosphocytidyl-2-C-methylerythritol synthetase; ispE, 4-diphosphocytidyl- 2-C-methyl-d-erythritol kinase; ispF, 2-C-methyl-d-erythritol-2,4-cyclodiphosphate synthase; ispG, (E)-4-hydroxy-3-methylbut-2-methyl-d-erythritol-2,4-cyclodiphosphate synthase; ispH, HMBPP reductase; IDI, IPP isomerase; PKSG, 3-hydroxy-3-methylglutaryl-ACP synthase