to clarify the influence of protein surrounding on the heme reactivity in heme proteins the effect of interaction between a porphyrin ring and pi-acceptor molecule , 1,2,4-trimethyl-pyridinium ( tmp ) , on the affinity of deuteroheme to axial ligands ( imidazole and cyanide ) has been studied as a model system .
C0033684
protein
C0018974
heme