Electronic Resource
Springer
Research in experimental medicine
185 (1985), S. 145-150
ISSN:
1433-8580
Keywords:
31P-NMR spectra
;
AP4
;
Resonances
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Summary 31P-NMR spectra were obtained from adenosine-5′-tetraphosphate under a variety of conditions and the four discernible resonances assigned. The pK-value of the metal-free compound was determined to be 6.4, the pK-value of the Mg2+ complex to be 5.3. The dissociation constant for the AP4⋅Mg2+ complex was estimated to be 10−4 M from the downfield shift of the resonances assigned to theγ- andδ-phosphorus nuclei. The binding of a second metal ion can also be followed by NMR; the dissociation constant for this ternary complex is several orders of magnitude larger than that for the binary complex.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01854900
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