# Understanding a chemical reaction from kegg

I came across a reaction that looks as follows:

In this reaction the polyphosphate is common in both the sides of the reaction. Does this act as enzyme? But from the website it seems that the enzyme is ADP-specific glucokinase(in the enzyme section click 2.7.1.63). Then what is the function of polyphosphate here?

The $n$ of the polyphosphate should be decreased by 1 on the reactant side relative to the product side:
$\ce{(P)_{n} + Glc -> G 6P + (P)_{n-1} }$