Ribosomal crystallography: a flexible nucleotide anchoring tRNA translocation, facilitates peptide-bond formation, chirality discrimination and antibiotics synergism |
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| Authors: | Agmon Ilana Amit Maya Auerbach Tamar Bashan Anat Baram David Bartels Heike Berisio Rita Greenberg Inbal Harms Joerg Hansen Harly A S Kessler Maggie Pyetan Erez Schluenzen Frank Sittner Assa Yonath Ada Zarivach Raz |
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| Affiliation: | Department of Structural Biology, The Weizmann Institute, 76100 Rehovot, Israel. |
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| Abstract: | The linkage between internal ribosomal symmetry and transfer RNA (tRNA) positioning confirmed positional catalysis of amino-acid polymerization. Peptide bonds are formed concurrently with tRNA-3' end rotatory motion, in conjunction with the overall messenger RNA (mRNA)/tRNA translocation. Accurate substrate alignment, mandatory for the processivity of protein biosynthesis, is governed by remote interactions. Inherent flexibility of a conserved nucleotide, anchoring the rotatory motion, facilitates chirality discrimination and antibiotics synergism. Potential tRNA interactions explain the universality of the tRNA CCA-end and P-site preference of initial tRNA. The interactions of protein L2 tail with the symmetry-related region periphery explain its conservation and its contributions to nascent chain elongation. |
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| Keywords: | Ribosome Peptide-bond formation Positional catalysis Antibiotics synergism Synercid Azithromycin Dual binding |
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