| ULS00070 | 5-phospho-alpha-D-ribose 1-diphosphate from D-ribose 5-phosphate (route I) | None - {{∅}} | True - {{t}} | Unconfirmed presence |  | 
                
                    | UCR06837 | alpha-D-ribose 1-phosphate = D-ribose 1,5-bisphosphate | None - {{∅}} | None - {{∅}} | Unexplained |  | 
                
                    | UCR01049 | ATP + D-ribose 5-phosphate = 5-phospho-alpha-D-ribose 1-diphosphate + AMP | None - {{∅}} | True - {{t}} | Unconfirmed presence |  | 
                
                    | UER00172 | 5-phospho-alpha-D-ribose 1-diphosphate from D-ribose 5-phosphate (route I): step 1/1~1 ATP + 1 D-ribose 5-phosphate => 1 5-phospho-alpha-D-ribose 1-diphosphate + 1 AMP. | None - {{∅}} | True - {{t}} | Unconfirmed presence |  | 
                
                    | ULS00071 | 5-phospho-alpha-D-ribose 1-diphosphate from D-ribose 5-phosphate (route II) | None - {{∅}} | None - {{∅}} | Unexplained |  | 
                
                    | VariantPath-1-UPA00087 |  | None - {{∅}} | None - {{∅}} | Unexplained |  | 
                
                    | UER00174 | 5-phospho-alpha-D-ribose 1-diphosphate from D-ribose 5-phosphate (route II): step 2/3~1 alpha-D-ribose 1-phosphate => 1 D-ribose 1,5-bisphosphate. | None - {{∅}} | None - {{∅}} | Unexplained |  | 
                
                    | UCR06836 | ATP + D-ribose 1,5-bisphosphate = 5-phospho-alpha-D-ribose 1-diphosphate + ADP | None - {{∅}} | None - {{∅}} | Unexplained |  | 
                
                    | UPA00087 | 5-phospho-alpha-D-ribose 1-diphosphate biosynthesis~Biosynthesis of 5-phospho-alpha-D-ribose 1-diphosphate biosynthesis (PRPP). PRPP may be synthesized from ribose 5-phosphate by PRPP synthase or, alternately, by the the enzymes phosphopentomutase, ribose 1-phosphokinase (putative), and ribose 1,5-bisphosphokinase [PMID:12700258]. Under conditions when xanthosine phosphorylase is produced, the enzyme can supply ribose 1-phosphate to this second pathway. | None - {{∅}} | True - {{t}} | Unconfirmed presence |  | 
                
                    | UCR01057 | alpha-D-ribose 1-phosphate = D-ribose 5-phosphate | None - {{∅}} | None - {{∅}} | Unexplained |  | 
                
                    | UER00175 | 5-phospho-alpha-D-ribose 1-diphosphate from D-ribose 5-phosphate (route II): step 3/3~1 ATP + 1 D-ribose 1,5-bisphosphate => 1 5-phospho-alpha-D-ribose 1-diphosphate + 1 ADP. | None - {{∅}} | None - {{∅}} | Unexplained |  | 
                
                    | UER00173 | 5-phospho-alpha-D-ribose 1-diphosphate from D-ribose 5-phosphate (route II): step 1/3~1 D-ribose 5-phosphate => 1 alpha-D-ribose 1-phosphate. | None - {{∅}} | None - {{∅}} | Unexplained |  | 
                
                    | VariantPath-2-UPA00087 |  | None - {{∅}} | True - {{t}} | Unconfirmed presence |  |