Cytochrome oxidase in oxidative phosphorylation is inhibited by
CO
H2S
Rotenone
Amobarbital
Cyanide and carbon monoxide kill because they disrupt the physiologic function of the heme proteins cytochrome oxidase and hemoglobin,respectively.Ref: Harper&;s Biochemistry; 30th edition; Chapter 6 Proteins: Myoglobin & Hemoglobin
Structure and function of protein