  We compute instanton corrections to non-minimal correlation functions of
chiral primary operators in the N=4 super Yang-Mills super-current multiplet.
Using a representation in terms of Mellin integrals, we find that these
corrections can be written as conformal integrals in AdS_5 times certain
"kinematic" prefactors that are independent of the instanton moduli. We then
consider the consecutive, pairwise light-like limit x_{i, i+1}^2 -> 0 of such
correlators, and prove that the ratio between the instanton contribution and
the corresponding tree-level expression vanishes in this limit. We also
speculate on the extension to the non-perturbative level of the proposed
duality with polygonal Wilson loops and briefly discuss its potential
implications for scattering amplitudes.
