期刊
EMBO REPORTS
卷 17, 期 12, 页码 1776-1784出版社
WILEY
DOI: 10.15252/embr.201642943
关键词
hydrolysis-resistant aminoacyl-tRNA analogs; peptide bond formation; proline; protein synthesis; ribosome
资金
- Foundation pour la Recherche Medicale en France [SPF20111223404]
- Austrian Science Fund FWF [P21641, I1040]
- French National Research Agency [ANR-15-CE11-0021-01]
- European Research Council [294312]
- Human Frontier Science Progra [RGP0062/2012]
- Austrian Science Fund (FWF) [P27947, I1040] Funding Source: Austrian Science Fund (FWF)
- Austrian Science Fund (FWF) [P 27947, I 1040] Funding Source: researchfish
Proline is an amino acid with a unique cyclic structure that facilitates the folding of many proteins, but also impedes the rate of peptide bond formation by the ribosome. As a ribosome substrate, proline reacts markedly slower when compared with other amino acids both as a donor and as an acceptor of the nascent peptide. Furthermore, synthesis of peptides with consecutive proline residues triggers ribosome stalling. Here, we report crystal structures of the eukaryotic ribosome bound to analogs of mono- and diprolyl-tRNAs. These structures provide a high-resolution insight into unique properties of proline as a ribosome substrate. They show that the cyclic structure of proline residue prevents proline positioning in the amino acid binding pocket and affects the nascent peptide chain position in the ribosomal peptide exit tunnel. These observations extend current knowledge of the protein synthesis mechanism. They also revise an old dogma that amino acids bind the ribosomal active site in a uniform way by showing that proline has a binding mode distinct from other amino acids.
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