Phosphorus-nitrogen donor interaction leading to atrane formation in phosphate and oxyphosphorane compositions. Implications for phosphoryl transfer enzymes(1).
Reaction of aminotriphenols, tris(2-hydroxy-3,5-dimethylbenzyl)amine (E) and tris(2- hydroxy-3-tert-butyl-5-methylbenzyl)amine (F), with triphenylphosphite, tris(p-methoxyphenyl)phosphite, or phenyldiphenoxyphosphane in the presence of N-chlorodiisopropylamine led to the isolation of tetraoxyphosphorane 1, pentaoxyphosphorane 3, phosphate-atrane 2, hexacoordinated pentaoxyphosphorane-atrane 4, and the first hexacoordinated tetraoxyphosphorane-atrane 5. X-ray analysis of 1-3 and 5 were obtained. NMR data is reported and supports that the atrane 4 has the same hexacoordinated structure as 5. Phosphate 2 reveals weak phosphorus-nitrogen donor action whereas the hexacoordinated atranes 4 and 5 have pronounced P-N coordination. The results are used to support amino acid donor action occurring at active sites of phosphoryl transfer enzymes. Increased strength of donor action in the higher-coordinate model activated state compared to that in the substrate phosphate composition should serve as a factor in enhancing enzyme reaction rates.
Timosheva
Natalya V
NV
Department of Chemistry, University of Massachusetts, Amherst, MA 01003-9336, USA.
Chandrasekaran
A
A
Holmes
Robert R
RR
D002384:Catalysis; D018360:Crystallography, X-Ray; D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation; D009584:Nitrogen / Q000737:chemistry*; D009943:Organophosphorus Compounds / Q000138:chemical synthesis*; D010758:Phosphorus / Q000737:chemistry*; D010770:Phosphotransferases / Q000737:chemistry*
D009943:Organophosphorus Compounds; D010758:Phosphorus; D010770:Phosphotransferases; D009584:Nitrogen