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Fatty Acid Catabolism
Fatty acid catabolism is the process of breaking down fatty acids for energy.
Sources of lipids for energy include dietary fat, stored fat, and synthesized fat from excess
carbohydrates.
Beta oxidation is the process by which fatty acids are broken down to produce ATP.
Ketone bodies are formed during fatty acid oxidation.
Fatty acids are excellent storage fuels due to their long alkyl chains and high energy yield
from oxidation.
Fats are insoluble in water and form fat droplets in cells, making no contribution to
osmolarity.
Fats need to be emulsified with bile salts and carried in the blood bound to proteins.
Lipid droplets in adipocytes store neutral lipids, such as triacylglycerols.
Lipid droplets are coated with perilipins and can be stimulated for lipolysis when blood
glucose levels are low.
Lipogenesis is the process of synthesizing fatty acids from carbohydrates and amino
acids.
Activation of fatty acids involves enzymes in the mitochondrial matrix and transport into
the mitochondria.
Acetyl-CoA is produced from fatty acids through a series of steps, including the formation
of fatty acyl-CoA.
Fatty acid oxidation involves the repeated process of dehydrogenation, hydration,
dehydrogenation, and thiolysis.
Palmitic acid (C16) undergoes seven cycles of the four-step process, resulting in eight
molecules of acetyl-CoA, FADH2, and NADH.
Acetyl-CoA enters the citric acid cycle for further oxidation, producing CO2, GTP, NADH,
and FADH2.
Beta-oxidation is the main pathway for the catabolism of fatty acids.
Fatty Acid Oxidation and Ketone Body Production
Unsaturated fatty acids contain cis double bonds and are not a substrate for enoyl-CoA
hydratase. Two additional enzymes are required to convert the cis double bonds to trans
double bonds.
Odd-numbered fatty acids form propionyl-CoA during the final cycle of β-oxidation. Three
extra reactions are required for the complete oxidation of odd-numbered fatty acids.
Fatty Acid Catabolism
Fatty acid catabolism is the process of breaking down fatty acids for energy.
Sources of lipids for energy include dietary fat, stored fat, and synthesized fat from excess
carbohydrates.
Beta oxidation is the process by which fatty acids are broken down to produce ATP.
Ketone bodies are formed during fatty acid oxidation.
Fatty acids are excellent storage fuels due to their long alkyl chains and high energy yield
from oxidation.
Fats are insoluble in water and form fat droplets in cells, making no contribution to
osmolarity.
Fats need to be emulsified with bile salts and carried in the blood bound to proteins.
Lipid droplets in adipocytes store neutral lipids, such as triacylglycerols.
Lipid droplets are coated with perilipins and can be stimulated for lipolysis when blood
glucose levels are low.
Lipogenesis is the process of synthesizing fatty acids from carbohydrates and amino
acids.
Activation of fatty acids involves enzymes in the mitochondrial matrix and transport into
the mitochondria.
Acetyl-CoA is produced from fatty acids through a series of steps, including the formation
of fatty acyl-CoA.
Fatty acid oxidation involves the repeated process of dehydrogenation, hydration,
dehydrogenation, and thiolysis.
Palmitic acid (C16) undergoes seven cycles of the four-step process, resulting in eight
molecules of acetyl-CoA, FADH2, and NADH.
Acetyl-CoA enters the citric acid cycle for further oxidation, producing CO2, GTP, NADH,
and FADH2.
Beta-oxidation is the main pathway for the catabolism of fatty acids.
Fatty Acid Oxidation and Ketone Body Production
Unsaturated fatty acids contain cis double bonds and are not a substrate for enoyl-CoA
hydratase. Two additional enzymes are required to convert the cis double bonds to trans
double bonds.
Odd-numbered fatty acids form propionyl-CoA during the final cycle of β-oxidation. Three
extra reactions are required for the complete oxidation of odd-numbered fatty acids.
