Schematic representation of the shikimic acid pathway. The first step is an aldol condensation between phosphoenol pyruvate  and erythrose-4-phosphate  catalyzed by 3-deoxy-D-arabinoheptulosonate-7-phosphate synthase (DAHP, or aroG/F/H according to E. coli nomenclature, EC 22.214.171.124) to synthesize 3-deoxy-D-arabino-heptulosonate-7-phosphate . The second step is carried out by 3-dehydroquinate synthase (DHQ synthase, aroB, EC 126.96.36.199), affording 3-dehydroquinate . The third step synthesizes 3-dehydroshikimate  catalyzed by 3-dehydroquinate dehydratase (DH-quinase, aroD, EC 188.8.131.52). Step 4 is catalyzed by shikimate dehydrogenase (Shikimate_DH, aroE, EC 184.108.40.206) to synthesize shikimate . Steps 5 and 6 are catalyzed by shikimate kinase (SKI, aroK, EC 220.127.116.11) and 5-enolpyruvylshikimate-3-phosphate synthase (EPSP, aroA, EC 18.104.22.168) to give shikimate-3-phosphate  and 5-enolpyruvylshikimate-3-phosphate , respectively. The last reaction, catalyzed by chorismate synthase (aroC, EC 22.214.171.124) affords the final product of the pathway, chorismate .