Independent binding sites of small protein B onto transfer-messenger RNA during trans-translation.

Laurent Metzinger 1 Marc Hallier 1 Brice Felden 1, *
* Auteur correspondant
Abstract : Stalled bacterial ribosomes are freed by transfer-messenger RNA (tmRNA). With the help of small protein B (SmpB), protein synthesis restarts and tmRNA adds a tag to the stalled protein for destruction. The conformation of a 347 nt long tmRNA from a thermophile and its interactions with SmpB were monitored using structural probes. The RNA is highly folded, including the reading frame, with <30% of unpaired residues. Footprints between SmpB and tmRNA are in the elbow of the tRNA domain, in some pseudoknots including one essential for function and in the lower part of the stem exiting the tRNA domain. The footprints outside the tRNA domain are scattered onto the tmRNA sequence, but form a cluster onto its tertiary structure derived from cryo-EM data. Some footprints flank the first triplet to be translated in tmRNA, suggesting that SmpB participates in the insertion of the tmRNA-encoded reading frame into the decoding center. To discriminate between a conformational rearrangement of tmRNA and independent binding sites, surface plasmon resonance was used and has identified three independent binding sites of SmpB on the RNA, including the site on the tRNA domain. Accordingly, SmpB is proposed to move on the tmRNA scaffold during trans-translation.
Type de document :
Article dans une revue
Nucleic Acids Research, Oxford University Press, 2005, 33 (8), pp.2384-94. 〈10.1093/nar/gki534〉
Liste complète des métadonnées

Littérature citée [27 références]  Voir  Masquer  Télécharger

http://www.hal.inserm.fr/inserm-00713126
Contributeur : Annick Lefevre <>
Soumis le : vendredi 29 juin 2012 - 13:56:51
Dernière modification le : mercredi 16 mai 2018 - 11:24:04
Document(s) archivé(s) le : dimanche 30 septembre 2012 - 02:26:21

Fichier

NAR_2005.pdf
Fichiers éditeurs autorisés sur une archive ouverte

Identifiants

Collections

Citation

Laurent Metzinger, Marc Hallier, Brice Felden. Independent binding sites of small protein B onto transfer-messenger RNA during trans-translation.. Nucleic Acids Research, Oxford University Press, 2005, 33 (8), pp.2384-94. 〈10.1093/nar/gki534〉. 〈inserm-00713126〉

Partager

Métriques

Consultations de la notice

156

Téléchargements de fichiers

103