Haem group, Biology

Assignment Help:

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.


Related Discussions:- Haem group

Acute versus chronic heart failure, When the syndrome sets in at a rapid ra...

When the syndrome sets in at a rapid rate before the compensatory mechanisms become operative, acute heart failure develops. The examples are acute heart failure due to acute myoca

Solubility of oxygen, Solubility of Oxygen It is also important to kno...

Solubility of Oxygen It is also important to know that solubility of gases decreases with the presence of solutes or increased salinity. Table shows the solubility of oxygen a

Salinity - marine ecosystems, Salinity - Marine Ecosystems Physico-...

Salinity - Marine Ecosystems Physico-chemical factors - Salinity The sea is salty and its salinity is fairly constant, averaging about 3.5 per cent usually written as

Modification of carbohydrate intake for specific disorder, Define Modificat...

Define Modification of Carbohydrate Intake for Specific Disorder? In our daily diet almost 60-7096' of energy is contributed by carbohydrates. Majority of them are comprised of

Prevent and control staphylococcal food poisoning, To prevent and control S...

To prevent and control Staphylococcal food poisoning: • Avoid contamination of foods • Kill organism by heating, refrigeration • Personnel hygiene • Adequate cookin

Define water losses by insensible perspiration, Define water losses by Inse...

Define water losses by Insensible perspiration? Insensible perspiration accounts for a relatively constant amount of water loss that is proportional to the surface area of the

Define placental secretion of oestrogens during pregnancy, Define Placental...

Define Placental secretion of oestrogens During pregnancy? Placental secretion of oestrogens increase with progression of pregnancy. Oestrogens perform many functions. They sti

Explain prostaglandins, Prostaglandins Prostaglandins belong  to a sub...

Prostaglandins Prostaglandins belong  to a subclass of  lipids known  as the eicosanoids because of their structural similarities to  the C-20  polyunsaturated  fatty acids, t

The exine layer, The Exine Layer It consists of two layers, inner (nex...

The Exine Layer It consists of two layers, inner (nexine) which is continuous and an outer (sexine) the sculptured one. The outer layer has ornamentations comprising rod-like

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd