Energy and Metabolism

ID #2205

I'm kind of confused with step 6 of glycolysis. In the previous steps the phosphate came from ATP hydrolysis. In this step it just shows a phosphate being added. Where does the phosphate come from?

There are thousands of reactions going on simultaneously in a living cell, many of which require a molecule of ATP as a source of energy. One of the by-products of a reaction like this is an ADP and a free phosphate group (Pi). So if a nearby reaction needs a phosphate group for some reason (and lots of them do), there's likely to be one available. Such is the case with this glycolytic reaction. 

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