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• W2013303604 endingPage "5314" @default.
• W2013303604 startingPage "5310" @default.
• W2013303604 abstract "The binding of N-acetyl-Phe-tRNAPhe (an analogue of peptidyl-tRNA), Phe-tRNAPhe, and deacylated tRNAPhe to poly(U)-programmed tightly coupled 70S ribosomes was studied. The N-acetyl-Phe-tRNAPhe binding is governed by an exclusion principle: not more than one N-acetyl-Phe-tRNAPhe can be bound per ribosome, although this peptidyl-tRNA analogue can be present either at the aminoacyl-tRNA (A) site or the peptidyl-tRNA (P) site. Two Phe-tRNAPhe molecules are accepted by one ribosome in the presence of poly(U). This aminoacyl-tRNA binds enzymatically (in the presence of elongation factor Tu and GTP) and nonenzymatically to the A site and is then transferred to the P site, if that site is free. If this elongation factor G-independent movement is hampered, either by using an incubation temperature of 0 degrees C or by the addition of the translocation inhibitor viomycin, only one Phe-tRNAPhe per ribosome can be bound. The effect of the peptidyltransferase inhibitor chloramphenicol on the binding is similar to that of viomycin. In the absence of poly(U), Phe-tRNAPhe cannot bind to the ribosome. Deacylated [14C]tRNAPhe can bind in three copies to one ribosome. The new third tRNA binding site is called the E site. The sequence of filling the sites is P, E, and A. The apparent binding constants for the P and the E sites are both approximately 9 X 10(6) M-1 and that for the A site is 1.3 X 10(6) M-1. In the absence of poly(U), only one deacylated tRNAPhe can be bound per ribosome. This tRNAPhe most likely occupies the P site." @default.
• W2013303604 created "2016-06-24" @default.
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• W2013303604 date "1981-09-01" @default.
• W2013303604 modified "2023-10-13" @default.
• W2013303604 title "Three tRNA binding sites on Escherichia coli ribosomes." @default.
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• W2013303604 doi "https://doi.org/10.1073/pnas.78.9.5310" @default.
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