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- W1502894906 abstract "Purified 50 S ribosomal subunits were found to contain significant amounts of protein coincident with the 30 S proteins S9 and/or S11 on two-dimensional polyacrylamide/urea electropherographs. Peptide mapping established that the protein was largely S9 with smaller amounts of S11. Proteins S5 and L6 were nearly coincident on the two-dimensional polyacrylamide/urea electropherographs. Peptide maps of material from the L6 spot obtained from purified 50 S subunits showed the presence of significant amounts of the peptides corresponding to S5. Experiments in which 35S-labelled 30 S subunits and non-radioactive 50 S subunits were reassociated to form 70 S ribosomes showed that some radioactive 30 S protein was transferred to the 50 S subunit. Most of the transferred radioactivity was associated with two proteins, S9 and S5. Sulfhydryl groups were added to the 50 S subunit by amidination with 2-iminothiolane (methyl 4-mercaptobutyrimidate). These were oxidized to form disulfide linkages, some of which crosslinked different proteins of the intact 50 S ribosomal subunit. Protein dimers were partially fractionated by sequential salt extraction and then by electrophoresis of each fraction in polyacrylamide gels containing urea. Slices of the gel were analysed by two-dimensional polyacrylamide/sodium dodecyl sulfate diagonal gel electrophoresis. Final identification of the constituent proteins in each dimer by two-dimensional polyacrylamide/urea gel electrophoresis showed that 50 S proteins L5 and L27 were crosslinked to S9. The evidence suggests that proteins S5, S9, S11, L5 and L27 are located at the interface region of the 70 S ribosome." @default.
- W1502894906 created "2016-06-24" @default.
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- W1502894906 date "1979-11-01" @default.
- W1502894906 modified "2023-09-26" @default.
- W1502894906 title "The subunit interface of the Escherichia coli ribosome" @default.
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- W1502894906 doi "https://doi.org/10.1016/0022-2836(79)90345-0" @default.
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