pentosyltransferase activity beta-ribofuranosylaminobenzene 5'-phosphate synthase activity https://github.com/geneontology/go-ontology/issues/28199 MetaCyc:RXN-22578 EC:2.4.2.54 RHEA:35815 molecular_function MetaCyc:RXN-8124 GO:0043793 beta-RFAP synthase activity RHEA:48556 Catalysis of the reaction: 4-hydroxybenzoate + 5-phospho-alpha-D-ribose 1-diphosphate + H+ = 4-(beta-D-ribofuranosyl)phenol 5'-phosphate + CO2 + diphosphate. Both 4-hydroxybenzoate and 4-aminobenzoate may be used as substrates, but only the former is known to be produced by methanogenic archaea.