Biology as Poetry: Biochemistry

Bacteriophage Ecology Group

Inorganic Phosphate (Pi)

H3PO4, a.k.a., phosphoric acid.

That is, the Pi in ATPADP + Pi, where the overall reaction is ATP hydrolysis. Alternatively, Pi in the endergonic reaction, ADP + Pi → ATP. Inorganic phosphate is simply a phosphate group that is no longer a functional group because it is no longer tethered..

Note that at physiological, that is, neutral pHs, phosphoric acid is normally found in an ionized form, that is, as a combination of H2PO4- and HPO42-.


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