Is ATP present in yeast cytosol predominantly as ionic ATP or magnesium salt?

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Christian Q. Scheckhuber

Mg-ATP is the biologically active form of ATP (also other ions can associate with ATP, however). As such I would assume that most of the cellular ATP in yeast (and other organisms) is present in the ion-associated form.

Cheers, Christian

Ana Maria Oliveira Battastini

I agree with the Christian answer .