PDB accession codes 1EYP , 1EYQ , 1FM7 , 1FM8 , 1JEP , 1JX0 , and 1JX1 . Chalcone isomerase has a core 2-layer alpha/beta structure consisting of beta(3)-alpha(2)-beta-alpha(2)-beta(3). [ 1 ] [ edit ] References ^ Jez JM, Bowman ME, Dixon RA, Noel JP (September 2000). "Structure and mechanism of