  We calculate the contribution to the proton decay amplitude from Kaluza-Klein
lepto-quarks in theories with extra dimensions, localised fermions and gauge
fields which propagate in the bulk. Such models naturally occur within the
context of M-theory. In SU(5) models we show that carefully including all such
modes gives a distinctive pattern of decays through various channels including
a strong suppression of decays into neutrinos or right handed positrons. By
contrast there is no such suppression for SO(10).
