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1974 (1)
1Author    KlausP. Hofmann, Georg ZundelRequires cookie*
 Title    Effect of the Protons Arising in Aqueous Hydrolysing ATP Solutions, IR Investigations  
 Abstract    IR spectra of 0.3 m aqueous solutions of Mgo.5K3_ nH w ATP were plotted. The dependence of the spectra on the hydrolysis was investigated for three different K/H ratios of the nonhydrolysed system. Changes to bands provide information as to the protons added to the phosphate groups and base residues as a function of the initial protonation and degree of hydrolysis. More and more proton addition to the — P 0 3__ groups is observed as the initial protonation increases and as the degree of hydrolysis rises. The same applies as far as the addition of protons to the base residues is concerned to the systems with a higher initial protonation. At low degrees of hydrolysis the P 0 43' ions which occur do not bind the two hydrolysis protons completely. 150% protonated P 0 43" ions first form which cross-like via 0 H +--'0 hydrogen bonds, which only become more strongly protonated in the systems with a higher initial protonation at large degrees of hydrolysis. The 0 H +---0 bonds between the 150% protonated hydrogen phosphate ions as well as the N H +,--N hydrogen bonds between the base residues cause an IR continuum and are thus easily polarizable. An extremely large change to the hydrate structure within narrow hydrolysis ranges is indicated by changes to the bands of the water molecules. The biological relevance of these findings is briefly discussed in the conclusions. Intermolecular Interaction in Systems with Energy-Rich Phosphates, II 
  Reference    (Z. Naturforsch. 29c, 29—35 [1974]; received July 10 1973) 
  Published    1974 
  Keywords    Energy-Rich Phosphate, ATP Hydrolysis, Hydrogen Bonds Polarizable, Intermolecular Interaction, Proton Addition 
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 TEI-XML for    default:Reihe_C/29/ZNC-1974-29c-0029.pdf 
 Identifier    ZNC-1974-29c-0029 
 Volume    29