دورية أكاديمية
أعرض في EDS

Unique Shine-Dalgarno Sequences in Cyanobacteria and Chloroplasts Reveal Evolutionary Differences in Their Translation Initiation.

التفاصيل البيبلوغرافية
العنوان: Unique Shine-Dalgarno Sequences in Cyanobacteria and Chloroplasts Reveal Evolutionary Differences in Their Translation Initiation.
المؤلفون: Wei Y; Department of Biology, University of Ottawa, Ontario, Canada., Xia X; Department of Biology, University of Ottawa, Ontario, Canada.; Ottawa Institute of Systems Biology, University of Ottawa, Ontario, Canada.
المصدر: Genome biology and evolution [Genome Biol Evol] 2019 Nov 01; Vol. 11 (11), pp. 3194-3206.
نوع المنشور: Journal Article; Research Support, Non-U.S. Gov't
اللغة: English
بيانات الدورية: Publisher: Oxford University Press Country of Publication: England NLM ID: 101509707 Publication Model: Print Cited Medium: Internet ISSN: 1759-6653 (Electronic) Linking ISSN: 17596653 NLM ISO Abbreviation: Genome Biol Evol Subsets: MEDLINE
أسماء مطبوعة: Original Publication: Oxford, UK : Oxford University Press
مواضيع طبية MeSH: Chloroplasts/*genetics , Cyanobacteria/*genetics , Prokaryotic Initiation Factors/*genetics, 5' Untranslated Regions ; Evolution, Molecular ; Symbiosis/genetics
مستخلص: Microorganisms require efficient translation to grow and replicate rapidly, and translation is often rate-limited by initiation. A prominent feature that facilitates translation initiation in bacteria is the Shine-Dalgarno (SD) sequence. However, there is much debate over its conservation in Cyanobacteria and in chloroplasts which presumably originated from endosymbiosis of ancient Cyanobacteria. Elucidating the utilization of SD sequences in Cyanobacteria and in chloroplasts is therefore important to understand whether 1) SD role in Cyanobacterial translation has been reduced prior to chloroplast endosymbiosis or 2) translation in Cyanobacteria and in plastid has been subjected to different evolutionary pressures. To test these alternatives, we employed genomic, proteomic, and transcriptomic data to trace differences in SD usage among Synechocystis species, Microcystis aeruginosa, cyanophages, Nicotiana tabacum chloroplast, and Arabidopsis thaliana chloroplast. We corrected their mis-annotated 16S rRNA 3' terminus using an RNA-Seq-based approach to determine their SD/anti-SD locational constraints using an improved measurement DtoStart. We found that cyanophages well-mimic Cyanobacteria in SD usage because both have been under the same selection pressure for SD-mediated initiation. Whereas chloroplasts lost this similarity because the need for SD-facilitated initiation has been reduced in plastids having much reduced genome size and different ribosomal proteins as a result of host-symbiont coevolution. Consequently, SD sequence significantly increases protein expression in Cyanobacteria but not in chloroplasts, and only Cyanobacterial genes compensate for a lack of SD sequence by having weaker secondary structures at the 5' UTR. Our results suggest different evolutionary pressures operate on translation initiation in Cyanobacteria and in chloroplast.
(© The Author(s) 2019. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution.)
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فهرسة مساهمة: Keywords: 16S rRNA; Cyanobacteria; RNA-Seq; Shine–Dalgarno; bacterial translation initiation; chloroplast
المشرفين على المادة: 0 (5' Untranslated Regions)
0 (Prokaryotic Initiation Factors)
تواريخ الأحداث: Date Created: 20191018 Date Completed: 20200323 Latest Revision: 20200323
رمز التحديث: 20231215
مُعرف محوري في PubMed: PMC6847405
DOI: 10.1093/gbe/evz227
PMID: 31621842
قاعدة البيانات: MEDLINE
الوصف
تدمد:1759-6653
DOI:10.1093/gbe/evz227