0.5 to 1.3 mM
||Bacteria Escherichia coli
||Stockbridge RB, Wolfenden R. Enhancement of the rate of pyrophosphate hydrolysis by nonenzymatic catalysts and by inorganic pyrophosphatase. J Biol Chem. 2011 May 27 286(21):18538-46 p.18541 left column bottom paragraphPubMed ID21460215
||Heinonen, J. K. (2001) Biological Role of Inorganic Pyrophosphate, Kluwer Academic Publishers, Boston
||At its estimated concentration in vivo (0.5–1.3?10^-3 M PPi in
E. coli) (primary source), most PPi is expected to be associated with Mg2+
(~1?10^-3 M free) (25) because Kd~5?10^-5 M at 25 °C (16).