The component of haemoglobin responsible for binding oxygen, consists of an iron ion that binds oxygen and a porphyrin ring that binds the globin molecules; one molecule binds one molecule of oxygen
Haem is ubiquitous, abundant and necessary for energy metabolism. Most bacteria have a haem biosynthesis pathway, but nevertheless, since haem is a major source of iron (an essential metal), microbes take up exogenous haem to retrieve iron.
The component of hemoglobin responsible for binding oxygen, consists of an iron ion that binds oxygen and a porphyrin ring that binds the globin molecules; one molecule binds one molecule of oxygen
the Iron-holding part of the hemoglobin and myoglobin proteins (about 40% of the Fe in meat, fish and poultry is bound into heme) Hemoglobin: the oxygen-carrying protein of the red blood cells