catalytic activity:P(1),P(4)-bis(5'-guanosyl) tetraphosphate + H(2)O = GTP + GMP.,cofactor:Divalent ions.,function:Asymmetrically hydrolyzes Ap4A to yield AMP and ATP. Plays a major role in maintaining homeostasis.,similarity:Belongs to the Nudix hydrolase family.,
mitochondrial matrix,
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