Beta oxidation: Difference between revisions
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''Odd-numbered saturated fatty acids'' | ''Odd-numbered saturated fatty acids'' | ||
Chains with an odd-number of carbons are oxidized in the same manner as even-numbered chains, but the final products are <scene name='95/951266/Cv/2'>propionyl-CoA</scene> and | Chains with an odd-number of carbons are oxidized in the same manner as even-numbered chains, but the final products are <scene name='95/951266/Cv/2'>propionyl-CoA</scene> and <scene name='43/430893/Cv/2'>acetyl-CoA</scene>. | ||
Propionyl-CoA is first carboxylated using a bicarbonate ion into D-stereoisomer of methylmalonyl-CoA, in a reaction that involves a biotin co-factor, ATP, and the enzyme [[propionyl-CoA carboxylase]]. The bicarbonate ion's carbon is added to the middle carbon of propionyl-CoA, forming a D-methylmalonyl-CoA. However, the D conformation is enzymatically converted into the L conformation by methylmalonyl-CoA epimerase, then it undergoes intramolecular rearrangement, which is catalyzed by methylmalonyl-CoA mutase (requiring B12 as a coenzyme) to form <scene name='43/430893/Cv/9'>succinyl-CoA</scene>. The succinyl-CoA formed can then enter the [[Citric Acid Cycle]]. | Propionyl-CoA is first carboxylated using a bicarbonate ion into D-stereoisomer of methylmalonyl-CoA, in a reaction that involves a biotin co-factor, ATP, and the enzyme [[propionyl-CoA carboxylase]]. The bicarbonate ion's carbon is added to the middle carbon of propionyl-CoA, forming a D-methylmalonyl-CoA. However, the D conformation is enzymatically converted into the L conformation by methylmalonyl-CoA epimerase, then it undergoes intramolecular rearrangement, which is catalyzed by methylmalonyl-CoA mutase (requiring B12 as a coenzyme) to form <scene name='43/430893/Cv/9'>succinyl-CoA</scene>. The succinyl-CoA formed can then enter the [[Citric Acid Cycle]]. | ||