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lipid metabolism biochemistry


Phosphatidic acid is an important intermediate in the synthesis of glycerophospholipids.

Fat can be consumed directly in the diet or derived (by the liver) from excess dietary carbohydrates. See all 24 lessons in college chemistry, including concept tutorials, problem drills and cheat sheets:© 2016 Rapid Learning Inc. All rights reserved In cholesterol synthesis, 2 acetyl-CoA are converted into acetoacetyl-CoA and then into HMG-CoA. The other 95% comes from the beta-oxidation of the three fatty acyl groups.On the cytosolic side of the outer mitochondrial membrane, acyl-CoA synthetase uses ATP to add a CoA to fatty acid, yielding fatty acyl-CoA. HMG-CoA reductase converts this into mevalonate.

Glucagon and epinephrine trigger hormone-sensitive lipase to release fatty acids from fat stores in adipose tissue.

That’s interesting because The LDL receptor is recycled to the surface, and the free cholesterol goes into the ER where it inhibits HMG-CoA reductase, downregulates synthesis of LDL receptors and upregulates ACAT. The level of APOC3 appears to be in part genetically determined.Stored TAGs in adipose tissue are used as a source of energy whenever fuel stores are low.

Fatty acids are activated, transported across mitochondrial membrane with the help of carnitine transporter. HDLs without APOC3 are probably good, but HDLs with APOC3 (~13% of HDL particles) are positively correlated with CVD. “Ketogenic diets” are high in fat, moderate in protein and low in carbohydrates. Additionally, patients should not take any medications that could change blood lipid levels or take the test during times of stress/illness for more accurate results.

Synthesis is regulated at the ACC step. [reviewed in Cohen & Armstrong].Acyl-CoA-cholesterol acyl transferase (ACAT) is a liver enzyme which catalyzes the transfer of fatty acids to cholesterol to yield cholesterol esters.

HMG-CoA reductase is the rate determining step of cholesterol synthesis and a major control point. More on that in the next lecture.

In muscle, fatty acids are oxidized for energy; in adipose tissue, they are re-esterized as TAGs for storage. Lipid Metabolism focuses on the regulation and metabolism of lipids.

TAGs are synthesized using dihydroxyacetone (a glycolysis intermediate). The objective questions are prepared based on the background taken from previous question papers of Profes-sional medical and Paramedical competitive entrance examinations. When cholesterol gets low, SCAP allows SREBP to proceed to the Golgi where it is cleaved by two different proteases to liberate a cytosolic domain which binds to the SREs in promoter regions and transactivates HMG-CoA reductase (HMGCR).Statins are competitive inhibitors of HMG-CoA reductase.

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