Haem group, Biology

Haem Group

A group of compounds called porphyrins are widely distributed in plants, animals and bacteria. Porphyrins associate with metals to form metalloporphyrins which form a variety of compounds. For example chlorophyll about which is a magnesium-porphyrin complex and cytochromes which contain porphyrin group play an important role in intracellular oxidation. When ferrous iron Fe++ is added to a porphyrin protoporphyrin IX, ferrous porphyrin or haem is formed. The molecular structure is shown in figure.  

1978_Haem Group.png

Figure:  Chemical structure of haem group (a), schematic representative of a single submit of haemoglobin (b).

The ferrous iron atom is bound to the four nitrogens of the protoporphyrin ring. The ferrous iron makes two more links, one with the oxygen atom to form oxyhaemoglobin and the other to the globin portion of the molecule at a single amino acid site.

Posted Date: 1/15/2013 7:51:57 AM | Location : United States







Related Discussions:- Haem group, Assignment Help, Ask Question on Haem group, Get Answer, Expert's Help, Haem group Discussions

Write discussion on Haem group
Your posts are moderated
Related Questions
Phases of Water The state of water can be changed from gaseous to liquid and liquid to solid and vice versa by the addition or removal of heat energy. To convert one gram of li

Q. Explain about Malnutrition Related Diabetes Mellitus? This type of diabetes has been categorized as a separate entity. 'if is 'Men seen commonly in developing countries, 1n

Upon admission the DPU nurse notes: Fasting status - fasted from 12 midnight, no morning medication taken. Consent - signed Pre anaesthetic check Test results

What is Gene Expression ? Gene expression is the process by which a gene is activated to produce a certain protein. Cells are able to respond to changes in the environment i

Explain the difference between numerical chromosome abnormalities and single gene disorders. Describe methods of diagnosing chromosome abnormalities prenatally and after birth. How

The process of fatty acid elongation is similar to fatty acid synthesis as it also requires both: -malonyl CoA and NADPH -malonyl CoA and NADH -Acetyl CoA and NADH

Airway: Place the patient  supine on a firm  surface with his  head at level  or  slightly lower than the level of heart. Immediately, clear the  airway and start  rescue brea

How are genetic diseases classified? The Genetic diseases classify into chromosomal abnormalities and genetic mutations. Between chromosomal abnormalities there are the aneu

Foods that are frequently incriminated in staphylococcal food poisoning include meat and meat products, poultry and egg products, egg, tuna, chicken, potato and macaroni, bakery pr

Rickets Rickets is a complex mineral deficiency disease of young, growing animals. It is characterized by defective mineralization of growing bones, persistence of hypertrophic