Liftgy

Different types of Lipids present in Plasma membrane

Home /

Lipids shows very wide diversity in their structure and their biological functions. They perform a very important role in membrane bilayer permeability as barrier to cells and organelles.
There are three types of lipid present in Plasma membranes. These are 1) Phospholipids, 2) Glycolipids, and 3) Sterol.
1] Phospholipids have a polar head group containing a phosphate group and to hydrophobic hydrocarbon tails- one tail is saturated while the other tail is unsaturated having one or more double bonds.

 it affects the packaging and fluidity of the membrane.

Phospholipids are again of two types- 

1)sphingolipids and  2)phosphoglycerides.
1). Sphingolipids are sphingosine-based phospholipids.
2). Phosphoglycerides are glycerol-based phospholipids they are also known as glycerophospholipids. It is the main phospholipid in animals. The most common lipids in the cellular membranes are glycerolipids.
A phosphoglyceride is classified according to the nature of its head group.
400px-Membrane_Lipids.svg.png

In a normal healthy cell, phosphatidylserine is present inside of the plasma membrane whereas in the apoptotic cell is flipped on outside of the plasma membrane. Therefore it is an indication of apoptotic cells.
At neutral PH the PC and PE carry no net electric charge whereas PI and PS carry a single net negative charge.

2] Glycolipids- are a combination of carbohydrates and lipids. Are linked by a covalent bond that is a glycosidic bond in the presence of glycosyltransferase enzyme.
Are found on the outer surface of the plasma membrane.

For example – Gangilosides (GM1)- Receptor for Cholera toxin.
3] Sterol – these are also a type of lipid molecule.
Animal sterol is cholesterol.
Plant sterol is phytosterol.
Fungal sterol is Ergosterol.
Liftgy