Hemoglobin and Myoglobin in Bio Inorganic Chemistry for CSIR NET/GATE/JAM EXAM in Chemistry Hindi

Описание: #Hemoglobin #Myoglobin #Bio_Inorganic_Chemistry

Hemoglobin: Hb consists of a tetramer of myoglobin sub units with four Fe sites that bind O_2 cooperatively. Its molecular weight = 64500 Dalton. Hb is found in red blood cells called erythrocytes and is responsible for their characterstic colour.

Hb picks up O_2 from lungs or gills and carries dioxygen in arterial blood to the muscles where the oxygen is transferred to another heme containing protein Mb which stores it until oxygen is required to decompose glucose to produce energy, CO_2 and water.

Hb then uses certain amino acid group to bind CO_2 and carry it in venous blood back to lungs.

Myoglobin: It is a Fe containing protein , Molecular wt. = 17000 Dalton. It co-ordinates O_2 reversibly and controls its concentration in tissues. It has a protein chain containing 153 amino acids residues folded about single heme. This restricts the access to the iron atom (by a second heme) and reduces the probability of formation of hematin-like (Fe III dimer).

In Mb, four co-ordination sites of Fe are attached to Nitrogen atom of four pyrrole ring, 5th co-ordination site is attached to nitrogen of imidazole ring of a proximal histidine of globin protein. The sixth vacant site trans to the imidazole nitrogen is vacant and reserved for dioxygen. Mb contains iron (II) in high spin state d^6 (HS).

Iron (II) has a radius of approximately 92 pm in a pseudo octahedral environment (square pyramidal arrangement when O_2 is removed) and the iron atom will not fit into the hole of porphyrin ring and it lies 42 pm above the plane of the nitrogen atom in porphrin ring.

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