Energy Molecules Usage
Country: United States
Date: February 2005
Why do our body use ATP to provide energy but not others
like GTP, CTP or TTP? They are all in side our body.
The way things evolved were that the enzymes involved in the electron
transport chain can phosphorylate ADP to produce ATP but not GDP to produce
GTP. Also, the enzymes involved in catalyzing glycolysis can only add PO4
to ADP and not GDP, CDP or UDP. Remember enzymes are specific because only
molecules with the right shape and charge can fit into their active sites.
Ron Baker, Ph.D.
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Update: June 2012