Studies of translatable mRNA for rabbit C-reactive protein.

C-reactive protein (CRP) mRNA was assayed by cell-free translation of poly(A)-containing liver RNA isolated both from rabbits stimulated to undergo the acute-phase response and from unstimulated control rabbits. No CRP-related translation products were identified until the denaturant methylmercury hydroxide (CH3HgOH) was added to the RNA before cell-free translation. In the presence of the denaturant, a 24000-Da translation product was synthesized which was immunochemically identifiable as the CRP primary translation product. It is likely that rabbit CRP mRNA can form a stable intramolecular duplex which interferes with its translatability in vitro. The 24000-Da CH3HgOH-facilitated cell-free translation product was not detected in poly(A)-containing liver RNA from unstimulated animals, indicating that the concentration of translatable CRP mRNA was dramatically induced during the acute-phase response. On the basis of absorption experiments, the 24000-Da CRP primary translation product was immunochemically more closely related to denatured CRP than to native CRP.