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Conserved small mRNA with an unique, extended Shine-Dalgarno sequence
- Up to now, very small protein-coding genes have remained unrecognized in sequenced genomes. We identified an mRNA of 165 nucleotides (nt), which is conserved in Bradyrhizobiaceae and encodes a polypeptide with 14 amino acid residues (aa). The small mRNA harboring a unique Shine-Dalgarno sequence (SD) with a length of 17 nt was localized predominantly in the ribosome-containing P100 fraction of Bradyrhizobium japonicum USDA 110. Strong interaction between the mRNA and 30S ribosomal subunits was demonstrated by their co-sedimentation in sucrose density gradient. Using translational fusions with egfp, we detected weak translation and found that it is impeded by both the extended SD and the GTG start codon (instead of ATG). Biophysical characterization (CD- and NMR-spectroscopy) showed that synthesized polypeptide remained unstructured in physiological puffer. Replacement of the start codon by a stop codon increased the stability of the transcript, strongly suggesting additional posttranscriptional regulation at the ribosome. Therefore, the small gene was named rreB (ribosome-regulated expression in Bradyrhizobiaceae). Assuming that the unique ribosome binding site (RBS) is a hallmark of rreB homologs or similarly regulated genes, we looked for similar putative RBS in bacterial genomes and detected regions with at least 16 nt complementarity to the 3′-end of 16S rRNA upstream of sORFs in Caulobacterales, Rhizobiales, Rhodobacterales and Rhodospirillales. In the Rhodobacter/Roseobacter lineage of α-proteobacteria the corresponding gene (rreR) is conserved and encodes an 18 aa protein. This shows how specific RBS features can be used to identify new genes with presumably similar control of expression at the RNA level.
Author: | Julia Hahn, Sebastian Thalmann, Anzhela Migur, Raphael Freiherr von Boeselager, Nina Kubatova, Elena Kubareva, Harald SchwalbeORCiDGND, Elena Evguenieva-Hackenberg |
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URN: | urn:nbn:de:hebis:30:3-468775 |
DOI: | https://doi.org/10.1080/15476286.2016.1256534 |
ISSN: | 1555-8584 |
ISSN: | 1547-6286 |
Pubmed Id: | https://pubmed.ncbi.nlm.nih.gov/27834614 |
Parent Title (English): | RNA biology |
Publisher: | Taylor & Francis |
Place of publication: | Philadelphia, Pa. |
Document Type: | Article |
Language: | English |
Year of Completion: | 2017 |
Date of first Publication: | 2017/03/31 |
Publishing Institution: | Universitätsbibliothek Johann Christian Senckenberg |
Release Date: | 2018/07/31 |
Tag: | Bradyrhizobium; RNA stability; Shine-Dalgarno; a-proteobacteria; ribosomal binding site; ribosome; sORF; small gene; small protein; translation initiation region |
Volume: | 14 |
Issue: | 10 |
Page Number: | 12 |
First Page: | 1353 |
Last Page: | 1363 |
Note: | This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited, and is not altered, transformed, or built upon in any way |
HeBIS-PPN: | 435981838 |
Institutes: | Biochemie, Chemie und Pharmazie / Biochemie und Chemie |
Exzellenzcluster / Exzellenzcluster Makromolekulare Komplexe | |
Wissenschaftliche Zentren und koordinierte Programme / Sonderforschungsbereiche / Forschungskollegs | |
Wissenschaftliche Zentren und koordinierte Programme / Zentrum für Biomolekulare Magnetische Resonanz (BMRZ) | |
Dewey Decimal Classification: | 5 Naturwissenschaften und Mathematik / 57 Biowissenschaften; Biologie / 570 Biowissenschaften; Biologie |
Sammlungen: | Universitätspublikationen |
Licence (German): | Creative Commons - Namensnennung-Nicht kommerziell - Keine Bearbeitung 4.0 |