Question

The enzyme decarboxylase catalyses the following step

• A. conversion of citric acid to cis aconitic acid
• B. fumaric acid to malic acid
• C. oxalosuccinic acid to α-ketoglutaric acid
• D. malic acid to oxaloacetic acid

Answer 1

Answer: (C)

Oxalosuccinate is decarboxylated to form a-ketoglutarate through the enzyme decarboxylase. It is one of the step involved in Krebs’ cycle. It releases one molecule of $C{O}_2$.
$\mathrm{Oxalosuccinate}\underset{\mathrm{M}{\mathrm{g}}^{2+}}{\overset{\text{Decarboxylase}}{\to }}\alpha \text{-}\mathrm{ketoglutarate}+\mathrm{CO}{}_2$