Deep Dive
From Glycolysis to Mitochondria
Professor Ayoub Lamsaf explains that after glycolysis, pyruvate enters the mitochondria if oxygen is present. It moves from the cytosol to the mitochondrial matrix, where it undergoes chemical transformations. This sets the stage for the Krebs cycle, a crucial part of cellular respiration.
Transformation to Acetyl-CoA
In the matrix, pyruvate encounters enzymes like decarboxylase and dehydrogenase. Decarboxylation removes carbon as CO2, while dehydrogenation removes hydrogen, which is captured by NAD+. This process forms acetyl-CoA, which is essential for the Krebs cycle.
The Krebs Cycle Unveiled
Acetyl-CoA combines with oxaloacetic acid to form citric acid, initiating the Krebs cycle. This cycle involves decarboxylation and dehydrogenation, producing CO2, NADH, FADH2, and ATP. Each cycle yields 3 NADH, 1 FADH2, and 1 ATP, doubling these outputs for two acetyl-CoA molecules.