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Protein Assignment
Unit 3 – Biology,

Structure and Function of Haemoglobin
Haemoglobin is a protein that is carries via the red blood cells. It picks up oxygen in the lungs and delivers it to the peripheral tissue to maintain that viability of cells. It is significantly composed of globin and heme that gives the red blood cells their characteristic colour and function.

Structure:-
A hemoglobin molecule consists of four polypeptide chains: two alpha chains, each with 141 amino acids and two beta chains, each with 146 amino acids. The protein portion of each of these chains is called "globin". The and b globin chains are very similar in structure. In this case, a and b refer to the two types of globin.

Figure 2 is a close up view of one of the heme groups of the human a chain from dexoyhemoglobin. In this view, the iron is coordinated by a histidine side chain from amino acid 87 (shown in green.)

Each a or b globin chain folds into 8 a helical segments (A-H)......

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Approximate Word Count: 598
Approximate Pages: 3 (250 words per double-spaced page)

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