Hyperproduction of phosphate-binding protein, PhoS, in strains carrying a multicopy plasmic containing the phoS gene, resulted in saturation of export sites. As a consequence, pre-PhoS was accumulated both in the inner membrane and in the cytoplasm. This was evidenced both in electron-microscopy and after cell fractionation. Only the membrane-associated precursor could be matured and exported. The signal sequence of the cytoplasmic pre-PhoS was slowly degraded. It was first cleaved about in its middle and then completely removed. Electron microscope studies demonstrated that the cytoplasmic pre-PhoS cannot be exported post-translationally.
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