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The Structure of Monosodium Phosphoenolpyruvate

Katti, SK and Hosur, MV and Viswamitra, MA (1981) The Structure of Monosodium Phosphoenolpyruvate. In: Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry, 37B (APR). 834 -838.

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CDH406P-.Na +.H20 , M r = 208.0, is monoclinic, Cc, a = 11.423 (2), b = 23.253 (5), c - 6.604 (1) A, fl = 123.63 (1) °, U = 1460.6 A 3, D x =. 1.89 Mg m -a, Z = 8, 2(Mo Ka) = 0.7107 A, p(Mo Ka) = 0.44 mm -~, F(000) = 840. Final R = 0.063 for 1697 reflections.The two crystallographically independent molecules of phosphoenolpyruvate (PEP) (A and B) are almost mirror images of each other, the mirror being the planar enolpyruvate group. The torsion angle C(3)-C(2)- O(1)-P(1) is 122.6 in A and -112.0 ° in B, in contrast to -209.1 ° in PEP.K. The enolic C(2)-O(1) has a partial double-bond character [1.401 (A), 1.386A (B)]. The high-energy P~O bond (1.595 and 1.610A) is comparable to that in PEP.K (1.612 A). Na(1) has six nearest neighbours while Na(2) has only five. The Na + ions are involved in binding only the phosphates of different molecules, in contrast to the K ÷ ion in PEP. K, which binds to both the phosphate and carboxyl ends of the same molecule. The planar carboxyl groups stack on each other at an average distance of 3.2 A instead of forming hydrogen-bonded dimers usually found in carboxylate structures.

Item Type: Journal Article
Publication: Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry
Publisher: International Union of Crystallography
Additional Information: Copyright of this article belongs to International Union of Crystallography.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 19 Jan 2010 09:54
Last Modified: 27 Nov 2018 15:45
URI: http://eprints.iisc.ac.in/id/eprint/23734

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