Abstract:
:To resolve a controversy in the literature concerning the affinity of Mg++ for ATP to be used in our noninvasive 31P NMR procedure for the determination of free Mg++ in living cells, we have reinvestigated the apparent dissociation constant of MgATP under physiologic ionic conditions and over the cellular range of ATP concentrations by a combination of NMR and optical absorbance techniques. The new combination method utilizes 31P NMR chemical shifts to determine the degree of Mg++ chelation of ATP in a solution containing free ATP and MgATP, and uses a properly calibrated indicator dye, antipyrylazo III, for optical measurement of free Mg++ in the same solution. The data yield an average value of 50 +/- 10 microM for the apparent dissociation constant of MgATP which indicates low levels of free Mg++ (less than 1 mM) in several different types of tissues, including perfused heart muscle, contrary to a recent report in the literature.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Gupta RK,Gupta P,Yushok WD,Rose ZBdoi
10.1016/0006-291x(83)91562-0subject
Has Abstractpub_date
1983-11-30 00:00:00pages
210-6issue
1eissn
0006-291Xissn
1090-2104pii
0006-291X(83)91562-0journal_volume
117pub_type
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