Answer :
These reaction can be combined with other standard citric acid cycle reaction to create a pathway from citrate to oxaloacetate that bypasses the reaction.
Certain microorganisms with an incomplete citric acid cycle decarboxylate alpha -keto glutarate to produce succinate semialdehyde. A dehydrogenase then converts succinate semialdhyde to succinate.
These reaction can be combined with other standard citric acid cycle reaction to create a pathway from citrate to oxaloacetate that bypasses the reaction.
These reaction is catalyzed and a step that is accompanied by the the phosphorylation of GDP. The alternate pathway therefore generates one less ATP than the standard citric acid cycle. There is no difference in the number of reduced cofactors generated.
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