Effect of T4 infection on initiation of protein synthesis and messenger specificity of initiation factor 3 |
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Authors: | L L Spremulli M A Haralson J M Ravel |
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Institution: | Clayton Foundation Biochemical Institute and the Department of Chemistry, The University of Texas, Austin, Texas 78712 U.S.A. |
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Abstract: | No alteration in the messenger specificity of initiation factor 3 (IF-3) is observed upon T4 phage infection of several strains of Escherichia coli. IF-3 present in the 1.0 m NH4Cl washes of ribosomes from T4-infected cells supports the translation of f2 RNA and T4 late mRNA with the same degree of efficiency as the IF-3 in the ribosomal washes obtained from uninfected cells. At high concentrations the ribosomal washes obtained from T4-infected cells are more inhibitory for both f2 RNA- and T4 late mRNA-directed protein synthesis than the ribosomal washes from uninfected cells. Furthermore, this increased inhibition is also observed in the poly(U)-directed synthesis of polyphenylalanine. These data suggest that translational controls exerted at the level of IF-3 probably do not account for the alterations in protein synthesis observed upon T4 infection. |
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