  We construct a minimal supersymmetric SO(10) grand unified model in 5
dimensions. The extra dimension is compactified on an S^1/(Z_2 x Z_2^\prime)
orbifold which has two in-equivalent fixed points. These are flat 4-dimensional
Minkowski spaces: the visible and the hidden branes. By orbifolding, the gauge
symmetry on the hidden brane is reduced down to the Pati--Salam gauge symmetry
SU(4) x SU(2)_L x SU(2)_R. On the visible brane the SO(10) is broken by the
ordinary Higgs mechanism down to SU(5). The resulting 4-dimensional theory has
the standard model gauge symmetry (the intersection of SU(5) and SU(4) x
SU(2)_L x SU(2)_R) and the massless spectrum consists of the MSSM gauge fields
and two Higgs doublets. The matter fields are assumed to live on the visible
brane. We discuss gauge coupling unification in our 5-dimensional model in
terms of corrections to the conventional 4-dimensional unification.
Supersymmetry is broken on the hidden brane (where mass terms for gauginos and
a mu term are generated) and communicated to squarks and sleptons via gaugino
mediation. We also discuss a possibility of linking the supersymmetry breaking
on the hidden brane to the Higgs mechanism responsible for partial breaking of
the gauge symmetry on the visible brane via the shining mechanism. Finally,
there are no operators of dimension 5 leading to proton decay. Proton decay
through dimension 6 operators is enhanced compared to conventional GUTs and can
be seen in current or next generation proton decay experiments.
