Thermodynamic quantities for the dissociation equilibria of biologically important compounds. 3. The dissociations of the magnesium salts of phosphoric acid, glucose 1-phosphoric acid and glycerol 2-phosphoric acid

Abstract

The succinic oxidase systemwasreconstructed, in presence of exogenous cytochrome c, from two inactive preparations, one, from the Neuro8pora strain C117, providing succinic dehydrogenase, the other from alkali-treated wild-type Neuro8pora or heart muscle preparations, providing cytochrome oxidase. 2. It was found in spectroscopic experiments that particles from the Neuro8pora strain poky reacted directly with wild-type or heart muscle particles to reconstruct the succinic oxidase system in the absence of a soluble component. I wish to thank Professor D. Keilin, F.R.S., for his interest and advice, and Mr P. B. Scutt for the samples of heart muscle preparation.

Uranium(VI) complexes with sugar phosphates in aqueous solution

“…Many studies about the complexation behavior of various metal ions with sugar phosphates have been published [5][6][7][8][9][10][11][12][13][14]. The first investigation of complex formation with actinides was the reaction of glucose 1-phosphate with uranium(VI) [15].…”

Thermochemistry of the biochemical reaction: { pyrophosphate(aq) + H2O(l) = 2 phosphate(aq)}

“…The basis of the selected values is now discussed. The thermodynamic quantities for reactions (5) to (11) and reactions (17) to (23) (see table 3) are the selected values from the recent review by Goldberg et al (20) The data for reaction (12) are from the carefully performed electrochemical study of Clarke et al (21) The pK and r H o m values pertinent to the selection of the Mg 2+ dissociation reactions are given in table 4. While these latter values are not needed for calculations on the results of our study (no Mg 2+ was present), they are needed to treat values of K and r H (cal) for reaction (1) from the literature.…”

A thermodynamic study of the conversion of chorismate to isochorismate

“…Also needed are thermodynamic quantities for binding of H + (aq) and Mg 2+ (aq) to HPO 2− 4 (aq). The thermodynamic quantities for the ionization of H 2 PO − 4 (aq) were calculated from Cox et al (21) The thermodynamic quantities for the dissociation of Mg 2+ (aq) from MgHPO 4 (aq) are from Clarke et al (22) These pK s and related quantities are summarized in table 4.…”