The structure of the ribosome with elongation factor G trapped in the posttranslocational state.
Gao, Y.G., Selmer, M., Dunham, C.M., Weixlbaumer, A., Kelley, A.C., Ramakrishnan, V.(2009) Science 326: 694-699
- PubMed: 19833919 Search on PubMedSearch on PubMed Central
- DOI: https://doi.org/10.1126/science.1179709
- Primary Citation Related Structures: 
4V5F - PubMed Abstract: 
Elongation factor G (EF-G) is a guanosine triphosphatase (GTPase) that plays a crucial role in the translocation of transfer RNAs (tRNAs) and messenger RNA (mRNA) during translation by the ribosome. We report a crystal structure refined to 3.6 angstrom resolution of the ribosome trapped with EF-G in the posttranslocational state using the antibiotic fusidic acid. Fusidic acid traps EF-G in a conformation intermediate between the guanosine triphosphate and guanosine diphosphate forms. The interaction of EF-G with ribosomal elements implicated in stimulating catalysis, such as the L10-L12 stalk and the L11 region, and of domain IV of EF-G with the tRNA at the peptidyl-tRNA binding site (P site) and with mRNA shed light on the role of these elements in EF-G function. The stabilization of the mobile stalks of the ribosome also results in a more complete description of its structure.
- MRC Laboratory of Molecular Biology, Hills Road, Cambridge, CB2 0QH, UK.
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