PF1664 Phosphoribosyl-AMP cyclohydrolase 209 HIS2_PYRFU MEIEKLLEQVNWEKNNGIVPVIVQDEKGEVLTLAYMNKEALRKTLETGIAHYYSRSKGRIRMKGEVSGNIQTVKEIKIDCDNDALLLIVSPKGPACHTGNYSCFYRKLGEPERVLPIDYSLSILKELEEIIKRRKETPVEGSYTSKLFKEGREKIYKKFGEEAIEVLVAEKRERIIYEVADLLYHLLVLLTYNDISLGEVMNELRRRRK Phosphoribosyl-ATP pyrophosphatase hisI hisIE Histidine biosynthesis bifunctional protein HisIE