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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

The two molecular weight forms of rat phenylalanine hydroxylase are encoded by different messenger RNAs.

Immunoprecipitation of the phenylalanine hydroxylase formed by translation of rat liver RNA in a rabbit reticulocyte cell-free protein synthesis system was used to examine the origin of the molecular weight heterogeneity of the enzyme. Sodium dodecyl sulfate-polyacrylamide electrophoresis of the immunoprecipitated products showed that in most cases a single specifically immunoprecipitated polypeptide was produced which corresponded to the higher molecular weight (H) form of phenylalanine hydroxylase (Mr = 50,000). The identity of the product was confirmed by immunological competition and peptide mapping. RNA from other rats, however, coded for both the H-form and the lower molecular weight (L) form of phenylalanine hydroxylase or for only the L-form. The evidence suggests that the L-form derives from a different mRNA, rather than by proteolysis of the H-form, an interpretation which is supported by the isolation of the lower form of phenylalanine hydroxylase from livers of some rats.[1]


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