The phosphophoryns show anomalous behavior in solution, and are easily degraded during extraction. They appear in varied forms in the teeth of different species and differ in the teeth of the same species in a developmental and age dependent fashion. This set of properties has made the characterization of the phosphophoryns by biochemical means a difficult and controversial subject. Bovine molar phosphophoryn, bPP, has been characterized in detail by a variety of physical methods, and then compared with the PP from other species by DEAE-HPLC, gel electrophoresis, and immunological cross reactivity. The possible existence of a proPP biosynthetic precursor has been investigated by rat incisor organ culture and examination of the 32P and 14C labeled products. These studies all show marked differences in the Mr values for the PP from teeth of different species, even when they are antigenically cross-reactive.
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