hisI 131 HIS3_BIFLO MTDTTYDNSTELDPRIAARLKRDAKGLVAAVIQQYDTREVLMVGYMNDEALRRTLTTGRVTFWSRSRQEYWRKGDTSGHVQYVKGVSLDCDGDALLVEVDQVGAACHTGKRSCFLEGGPLPVVEGHRPAEQ BL0686 Phosphoribosyl-AMP cyclohydrolase