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Step 4: This step is
very similar to step 1. Succinyl-CoA reacts with water, and releases
the Coenzyme A to form succinic acid. This reaction releases enough
energy to form an ATP. The removal of coenzyme A actually allows
a molecule of GDP (guanine diphosphate) to be phosphorylated to
GTP (guanine triphosphate). The GTP quickly turns over its 3rd phosphate
group to ADP resulting in a molecule of ATP and GDP. The enzyme
responsible is succinyl-CoA synthetase.
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Kreb's Cycle