PDHE NI. en ribbon model of pyruvate dehydrogenase subunit PDHE of PDH tetramer with thiamin diphosphate as balls from PDB NI Ref Ciszak et al Structural basis for flipflop action of thiamin pyrophosphatedependent enzymes revealed by human pyruvate dehydrogenase Biol Chem PMID DOI adapted from pdb org pdb using PyMOL Ayacop