Dynamics of release factor recycling during translation termination in bacteria
| Autor: | Arjun Prabhakar, Michael Y Pavlov, Jingji Zhang, Gabriele Indrisiunaite, Jinfan Wang, Michael R Lawson, Måns Ehrenberg, Joseph D Puglisi |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Nucleic Acids Research. |
| ISSN: | 1362-4962 0305-1048 |
| DOI: | 10.1093/nar/gkad286 |
| Popis: | In bacteria, release of newly synthesized proteins from ribosomes during translation termination is catalyzed by class-I release factors (RFs) RF1 or RF2, reading UAA and UAG or UAA and UGA codons, respectively. Class-I RFs are recycled from the post-termination ribosome by a class-II RF, the GTPase RF3, which accelerates ribosome intersubunit rotation and class-I RF dissociation. How conformational states of the ribosome are coupled to the binding and dissociation of the RFs remains unclear and the importance of ribosome-catalyzed guanine nucleotide exchange on RF3 for RF3 recycling in vivo has been disputed. Here, we profile these molecular events using a single-molecule fluorescence assay to clarify the timings of RF3 binding and ribosome intersubunit rotation that trigger class-I RF dissociation, GTP hydrolysis, and RF3 dissociation. These findings in conjunction with quantitative modeling of intracellular termination flows reveal rapid ribosome-dependent guanine nucleotide exchange to be crucial for RF3 action in vivo. |
| Databáze: | OpenAIRE |
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