Members of this protein family are the enzyme polyphosphate kinase 1 (PPK1). This family is found in many prokaryotes and also in Dictyostelium. Sequences in the seed alignment were taken from prokaryotic consecutive two-gene pairs in which the other gene encodes an exopolyphosphatase. It synthesizes polyphosphate from the terminal phosphate of ATP but not GTP, in contrast to PPK2. [Central intermediary metabolism, Phosphorus compounds]
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