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We propose a mechanism for sufficient suppression of dimension-5 operatorsfor proton decay in a supersymmetric SO(10) model. This mechanism is analogueto the double seesaw mechanism in studying neutrino masses. Only anintermediate VEV instead of an intermediate scale is required so that gaugecoupling unification is maintained. The VEV is generated by introducing ananomalous U(1) symmetry whose breaking is at higher scale. The proton decayamplitudes are suppressed by this VEV over the GUT scale. We use$\textbf{45+54}$ in breaking GUT symmetry. $\textbf{120}$ is included so thatfermion sector is fully realistic. Assuming a minimal fine-tuning in the Higgsdoublet sector, $\textrm{tan}\beta$ of order one is predicted.

Proton decay suppression in a supersymmetric SO(10) model