STRUCTURE OF HEME

Hemoproteins are haemoglobin, myoglobin, cytochromes (cytochrome C, cytochrome P₄₅₀), catalase.

HAEMOGLOBIN-

Haemoglobin is an allosteric protein.
Each subunit of Hb is composed of protein part (globin) & non protein prosthetic group (Heme).
Each Hb molecule is made up of-

Hb= 4 heme molecules + 4 polypeptide chains (2pairs of same polypeptide)

Heme is a derivative of porphyrin composed by 4 pyrrole ring.
The iron is held in the centre of porphyrin ring in ferrous form (Fe⁺²)
Heme is a ferroprotoporphyrin.

4 bonds- between iron and nitrogen atoms
5^th bond- between nitrogen atoms of histidine residue of globin chain called as proximal histidine.
6^th bond with oxygen (distal histidine)
Distal histdine (His E₇) reduces affinity of heme for carbon monoxide (CO).
Each molecule of haemoglobin combine upto 4 molecules of oxygen.

Exam Important

Hemoproteins are haemoglobin, myoglobin, cytochromes (cytochrome C, cytochrome P₄₅₀), catalase.
Haemoglobin is an allosteric protein.
Each subunit of Hb is composed of protein part (globin) & non protein prosthetic group (Heme).
Each Hb molecule is made up of-

Hb= 4 heme molecules + 4 polypeptide chains (2pairs of same polypeptide)

The iron is held in the centre of porphyrin ring in ferrous form (Fe⁺²)
5^th bond- between nitrogen atoms of histidine residue of globin chain called as proximal histidine.
Distal histdine (His E₇) reduces affinity of heme for carbon monoxide (CO).
Each molecule of haemoglobin combine upto 4 molecules of oxygen.

Don’t Forget to Solve all the previous Year Question asked on STRUCTURE OF HEME
Click Here to Start Quiz

STRUCTURE OF HEME

Hemoproteins are haemoglobin, myoglobin, cytochromes (cytochrome C, cytochrome P₄₅₀), catalase.

HAEMOGLOBIN-

Haemoglobin is an allosteric protein.
Each subunit of Hb is composed of protein part (globin) & non protein prosthetic group (Heme).
Each Hb molecule is made up of-

Hb= 4 heme molecules + 4 polypeptide chains (2pairs of same polypeptide)

Heme is a derivative of porphyrin composed by 4 pyrrole ring.
The iron is held in the centre of porphyrin ring in ferrous form (Fe⁺²)
Heme is a ferroprotoporphyrin.

4 bonds- between iron and nitrogen atoms
5^th bond- between nitrogen atoms of histidine residue of globin chain called as proximal histidine.
6^th bond with oxygen (distal histidine)
Distal histdine (His E₇) reduces affinity of heme for carbon monoxide (CO).
Each molecule of haemoglobin combine upto 4 molecules of oxygen.

Exam Important

Hemoproteins are haemoglobin, myoglobin, cytochromes (cytochrome C, cytochrome P₄₅₀), catalase.
Haemoglobin is an allosteric protein.
Each subunit of Hb is composed of protein part (globin) & non protein prosthetic group (Heme).
Each Hb molecule is made up of-

Hb= 4 heme molecules + 4 polypeptide chains (2pairs of same polypeptide)

The iron is held in the centre of porphyrin ring in ferrous form (Fe⁺²)
5^th bond- between nitrogen atoms of histidine residue of globin chain called as proximal histidine.
Distal histdine (His E₇) reduces affinity of heme for carbon monoxide (CO).
Each molecule of haemoglobin combine upto 4 molecules of oxygen.

Don’t Forget to Solve all the previous Year Question asked on STRUCTURE OF HEME
Click Here to Start Quiz

STRUCTURE OF HEME