  The large freedom in the SM fermionic mass matrices allows for large LH and
LH quark rotations. This is a natural possibility in view of the observed large
leptonic mixing. Proton decay and especially its gauge mediated decay is
sensitive also to those mixing angles which are non-relevant in the SM. A model
with realistic mass matrices and large rotations is presented.. It is shown
that the large leptonic mixing leads to enhancement of the proton decay
branching ratios involving muons.
