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Motivated by the ongoing searches for new physics at the LHC, we explore thelow energy consequences of a D-brane inspired $ SU(4)_C\times SU(2)_L \timesSU(2)_R$ (4-2-2) model. The Higgs sector consists of an $SU(4)$ adjoint, a pair$H+\bar H$ in $(4,1,2)+(\bar 4,1,2)$, and a bidoublet field in $h(1,2,2)$. Withthe $SU(4)$ adjoint the symmetry breaks to a left-right symmetric$SU(3)_C\times U(1)_{B-L} \times SU(2)_L \times SU(2)_R$ model. A missingpartner mechanism protects the $SU(2)_R$ Higgs doublets in $H,\bar H$, whichsubsequently break the symmetry to the Standard Model at a few TeV scale. Aninverse seesaw mechanism generates masses for the observed neutrinos and alsoyields a sterile neutrino which can play the r\^ole of dark matter if its masslies in the keV range. Other phenomenological implications including protondecay are briefly discussed.

Light Sterile Neutrino and Low Scale Left-Right Symmetry in D-brane inspired $SU(4)_C \times SU(2)_L \times SU(2)_R$