Where does desaturation of fatty acids occur?
chloroplasts
The first desaturation reaction catalysed by a soluble Δ9 acyl-acyl carrier desaturase on aliphatic chains of plants fatty acids occurs in the chloroplasts or plastid tissues. It may also take place in the endoplasmic reticulum derivatives of very long chain CoA53,54.
Does desaturase increase fluidity?
If a cell in early growth phase produces more saturated than unsaturated fatty acids, the membrane fluidity would be sufficiently reduced to allow the desaturases to act on its membrane phospholipids thereby increasing the degree of unsaturation and hence the fluidity of the membranes.
What is PUFA in biochemistry?
Polyunsaturated fatty acids (PUFAs) are fatty acids that contain more than one double bond in their backbone. This class includes many important compounds, such as essential fatty acids and those that give drying oils their characteristic property.
What is fatty acid desaturation?
Abstract Desaturation of a fatty acid first involves the enzymatic removal of a hydrogen from a methylene group in an acyl chain, a highly energy-demanding step that requires an activated oxygen intermediate.
What is the role of desaturase?
A fatty acid desaturase is an enzyme that removes two hydrogen atoms from a fatty acid, creating a carbon/carbon double bond.
What do Elongases do lipid metabolism?
In mammalian cells, elongases and desaturases play critical roles in regulating the length and degree of unsaturation of fatty acids and thereby their functions and metabolic fates.
What enzyme elongates fatty acids?
Fatty acid synthase utilizes acetyl CoA and malonyl CoA to elongate fatty acids by two carbons.
What increases membrane fluidity?
One way to increase membrane fluidity is to heat up the membrane. Lipids acquire thermal energy when they are heated up; energetic lipids move around more, arranging and rearranging randomly, making the membrane more fluid.
What increases fluidity of phospholipid bilayer?
As temperature increases, so does phospholipid bilayer fluidity. At high temperatures the opposite process occurs, phospholipids have enough kinetic energy to overcome the intermolecular forces holding the membrane together, which increases membrane fluidity.