Download MendeleyScaffolding as an organizing principle in trans-translation. The roles of small protein B and ribosomal protein S1.
Gillet, R., Kaur, S., Li, W., Hallier, M., Felden, B., Frank, J.(2007) J Biol Chem 282: 6356-6363
- PubMed: 17179154
- DOI: https://doi.org/10.1074/jbc.M609658200
- Primary Citation of Related Structures:
2OB7 - PubMed Abstract:
A eubacterial ribosome stalled on a defective mRNA can be released through a quality control mechanism referred to as trans-translation, which depends on the coordinating binding actions of transfer-messenger RNA, small protein B, and ribosome protein S1. By means of cryo-electron microscopy, we obtained a map of the complex composed of a stalled ribosome and small protein B, which appears near the decoding center. This result suggests that, when lacking a codon, the A-site on the small subunit is a target for small protein B. To investigate the role of S1 played in trans-translation, we obtained a cryo-electron microscopic map, including a stalled ribosome, transfer-messenger RNA, and small protein Bs but in the absence of S1. In this complex, several connections between the 30 S subunit and transfer-messenger RNA that appear in the +S1 complex are no longer found. We propose the unifying concept of scaffolding for the roles of small protein B and S1 in binding of transfer-messenger RNA to the ribosome during trans-translation, and we infer a pathway of sequential binding events in the initial phase of trans-translation.
Organizational Affiliation:
Université de Rennes I, IFR 140, UPRES JE 2311, INSERM U835 Biochimie Pharmaceutique, 2 Avenue du Professeur Léon Bernard, 35043 Rennes, France.
