they say atp is the energy currency of the cell, does atp always come as atp-mg2 ?

Edited July 17, 201114 yr by kellbrook

ATP itself does not contain Mg. However, ATP that is found in complexes often contains Mg- but not covalently bound.

Edited July 18, 201114 yr by CharonY

I think so... Indeed, the real substrate for enzymes that use ATP is never the ATP molecule, but is the complex ATP-Mg2+. This ion is important for electric charge shielding of the phosphate groups.

inside the body can atp exist as atp alone or does it always have to be attched to something like magneisum?

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