Specificity of protein synthesis by bacterial ribosomes and initiation factors: Absence of change after phage T4 infection |
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Authors: | Emanuel Goldman Harvey F Lodish |
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Institution: | Department of Biology, Massachusetts Institute of Technology 77 Massachusetts Avenue, Cambridge, Mass. 02139, U.S.A. |
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Abstract: | Using several natural messenger RNA's—f2 RNA, Qβ RNA, T7 RNA, T4 early mRNA, T4 late mRNA and Escherichia coli RNA—ribosomes isolated from cells either 5 or 12 minutes after T4 infection direct synthesis of only 35 to 70% as much protein as do ribosomes from uninfected cells. However, with poly(U) or formaldehyde-treated f2 RNA message, both types of ribosomes work equally well. Experiments mixing salt-washed ribosomes and initiation factors from these cells show, in agreement with work of others, that the reduction with natural messages is due only to changes in the initiation factors. |
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