Myoglobin and Hemoglobin
*Both myoglobin and hemoglobin are metal porphyrins . Which contains the haemo group in their structure.
*The haemo group consist of an iron atom which is coordinated to four nitrogen atoms of Porphyrins rings.
*In myoglobin , haemo group is embedded in a crevice formed by the coiling of its polypeptide chain containing 150 to 160 amino acid residues.
*The molar mass of myoglobin is about 17000.
*Myoglobin which has not taken u oxygen is called deoxymyoglobin.
* Haemoglobin which has a mass of about 64500,consist of 4 myoglobin like sub units.
*Each sub unit of haemoglobin contains a polypeptide chain and a haemo group coordinated through the N atom of the histidine group of its polypeptide chain.
* The 4 sub units of haemoglobin are linked with one another through salt bridges present between the 4 polypeptide chain.
* The oxygenated haemoglobin is called oxyhaemoglobin
The haemoglobin which is not taken up oxygen is called deoxyhaemoglobin.
*The 5 coordinated Fe (II) present in myoglobin and haemoglobin
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