Figure 1.
His biosynthesis (black) and related ATP synthesis (blue, red) and recycling (blue) pathways in Arabidopsis. Numbers refer to specific HISN gene products listed in Table I. His intermediates shown: PRPP, Phosphoribosyl pyrophosphate; PR-ATP, phosphoribosyl ATP; PR-AMP, phosphoribosyl AMP; 5′-ProFAR, pro-phosphoribosyl formimino-5-aminoimidazole-4-carboxamide ribonucleotide; PRFAR, phosphoribulosyl formimino-5-aminoimidazole-4-carboxamide ribonucleotide; IGP, imidazoleglycerol phosphate; IAP, imidazoleacetol phosphate; Hol-P, l-histidinol phosphate; Hol, histidinol; His, l-His.