It will slow down the reaction rate as the four subunits compete for substrate and thus will show competitive inhibition.
When the inhibitor and substrate attach to the same location, competitive inhibition results. The structural similarity between the substrate and the inhibitor provides the molecular basis for the binding of competitive inhibition at the active site. As a result, the enzyme is "tricked" into identifying and binding the inhibitor. All the subunits of the enzyme are identical and thus they might compete with each for binding to active site and thus slow down the reaction rate.
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