||Bacteria Escherichia coli
||Amin N, Peterkofsky A. A dual mechanism for regulating cAMP levels in Escherichia coli. J Biol Chem. 1995 May 19 270(20):11803-5. p. 11805 left columnPubMed ID7744829
||Rosenberg H, Russell LM, Jacomb PA, Chegwidden K. Phosphate exchange in the pit transport system in Escherichia coli. J Bacteriol. 1982 Jan149(1):123-30. p.129 left column 2nd paragraphPubMed ID7033203
||Under conditions of carbon source starvation, E. coli cells accumulate Pi to levels of approximately 20-30 mM (primary source). Under typical growth conditions, there are numerous controls (the Pho regulon) that maintain the cytoplasmic Pi at a high concentration (approximately 10 mM BNID 105540). Note-Primary source gives internal Pi of 20 to 30mM in normal cells, rather than cells under carbon starvation.