Figure 1. . Metabolic pathway.

Figure 1.

Metabolic pathway. Propionyl-CoA carboxylase (PCC) catalyzes the conversion of propionyl-CoA to methylmalonyl-CoA, which enters the Krebs cycle via succinyl-CoA. Sources of propionate include: valine, isoleucine, threonine, methionine, odd-chain fatty acids, and cholesterol. Deficiency of PCC results in propionic acidemia (PA) and accumulation of 3-OH propionate, methylcitrate and glycine, among other metabolites. PCC is located inside the mitochondrion. PCC, a heterododecamer (α6β6), comprises 6 α-subunits (orange) and six β-subunits (purple). Biotin (blue), bicarbonate, and ATP have binding sites in the α-subunit. The β-subunits form a central core.

From: Propionic Acidemia

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Pagon RA, Adam MP, Ardinger HH, et al., editors.
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