DSP-PP C-Terminal Conservation Is Crucial for Accurate DSP-PP Precursor Cleavage

Dentin Sialoprotein (DSP) and Phosphophoryn (PP), acidic proteins critical to dentin mineralization, are translated from a single transcript as a DSP-PP precursor that undergoes proteolytic processing to generate DSP and PP. Because of the difficulty in obtaining large amounts of DSP-PP, we used a Sf9-baculovirus expression system to yield large amounts of DSP-PP