Imidodiphosphate and Pyrophosphate: Possible Biological Significance of Similar Structures

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Science  19 Dec 1969:
Vol. 166, Issue 3912, pp. 1510-1511
DOI: 10.1126/science.166.3912.1510


The structure of sodium imidodiphosphate has been determined by single crystal x-ray diffraction. The P-N-P bond angle (127.2°) and P-N bond distance (1.68 angstroms) are remarkably similar to newly refined values for the P-O-P bond angle (128.6°) and the bridging P-O bond distance (1.63 angstroms) of sodium pyrophosphate. This close similarity may explain why P-N-P linkages in algal "polyphosphates" escaped detection until recently and why adenosine triphosphate analogs with this linkage mimic adenosine triphosphate so closely.

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