Coat protein repression of bacteriophage M12 RNA directed polysome formation

Synthesis of bacteriophage M13-specific proteins in a DNA-dependent cell-free system. II. In vitro synthesis of biologically active gene 5 protein

It is shown that gene 5 protein of bacteriophage M13 is one of the major proteins synthesized in vitro under the direction of M13 replicative-form DNA. By means of DNA-cellulose chromatography, this protein has been purified to homogeneity and its biological characteristics have been compared with those of its native counterpart. Like native gene 5 protein, the purified, in vitro-synthesized protein binds tightly and selectively to single-stranded, but not to double-stranded, DNAs. These results suggest that truly functional gene 5 protein is made in the cell-free system.

Direct evidence for messenger activity of influenza virion RNA

In a cell-free system of Escherichia coli, RNA from influenza virus particles is translated into a polypeptide antigenically identical with the ribonucleoprotein and several more proteins, some of which correspond in size to viral structural components.

Specificity of formation of complexes between coat protein and bacteriophage f2 RNA

The specificity of formation of phage f2 RNA-protein complexes was studied. Complex I contains up to 8 mol of coat protein per 1 mol of RNA. Its formation proceeds equally well in medium (i) without magnesium ions, (ii) containing magnesium ions, (iii) containing 4 mM EDTA, and (iv) at temperatures from 0 to 45 C. Complex II contains up to 200 mol of coat protein per 1 mol of RNA. Its formation is inhibited by the presence of magnesium ions in medium. Formaldehyde- or methoxyamine-treated f2 RNA in which only exposed bases were modified showed a normal pattern of complex II formation, whereas formation of complex I was inhibited or abolished. We conclude that complex I formation involves the interaction between coat protein and specific region of exposed bases in RNA. A possible site of attachment of coat protein is discussed.

Translation of avian myeloblastosis virus RNA in a cell-free lysate of Escherichia coli

In a cell-free extract of E. coli, RNA from avian myeloblastosis virus directs the synthesis of a protein that is antigenically identical with the group-specific antigen 4, and other proteins, three of which correspond in molecular weight to group-specific antigens 1-3.