The structure of monosodium phosphoenolpyruvate

Monosodium phosphoenolpyruvate hydrate: new diffractometer data

“…This redetermination has yielded e.s.d. 's about half those achieved by Katti et al (1981). The structures of phosphoenolpyruvic acid (PEP) and of the anions PEP-, PEP 2-and PEP 3-are therefore now known to similar precision since the structures of two polymorphic forms of cyclohexylammonium phosphoenolpyruvate were given by Weichsel & Lis (1989a) and that of the potassium salt by Lis (1987) while phosphoenolpyruvic acid itself has been described by Weichsel & Lis (1989b).…”

“…The structure of sodium phosphoenolpyruvate hydrate was determined by Katti, Hosur & Viswamitra (1981) from 1697 diffractometer data with final R = 0-063. A fragment of 0-25-× 0.2 × 0.5 mm was cut from a larger crystal and mounted on a Syntex P21 diffractometer.…”

“…No absorption or extinction corrections. The refinement was started with the published coordinates of Katti et al (1981). Merging in point group m yielded 3871 reflections, 3357 with I> 3o-(1) (including 1212 Friede!…”

Structure of silver(I) barium phosphoenolpyruvate trihydrate

“…The free energy of hydrolysis of PEP (-58-5 kJ mol-i) is the highest among naturally occurring phosphates (Lehninger, 1971) and the kinetics of PEP hydrolysis reactions depend strongly on the pH (Benkovic & Schray, 1968). From among four PEP forms the structures of the PEP acid (Weichsel, Lis & Kuczek, 1989), the PEP monoanion [monosodium salt (Katti, Hosur & Viswamitra, 1981), the monopotassium salt (Lis, 1987), the monocyclohexylammonium salts ] and the PEP dianion [bis(cyclohexylammonium) methanol solvate 1/0.5 (Weichsel & Lis, 1990)] have been described. Here we present the structure of the PEP trianion as a silver(I) barium trihydrate salt.…”