Reference : 70S-scanning initiation is a novel and frequent initiation mode of ribosomal translat...
Scientific journals : Article
Life sciences : Biochemistry, biophysics & molecular biology
Systems Biomedicine
http://hdl.handle.net/10993/26180
70S-scanning initiation is a novel and frequent initiation mode of ribosomal translation in bacteria.
English
Yamamoto, Hiroshi [> >]
Wittek, Daniela [> >]
Gupta, Romi [> >]
Qin, Bo [> >]
Ueda, Takuya [> >]
Krause, Roland mailto [University of Luxembourg > Luxembourg Centre for Systems Biomedicine (LCSB) > > ; Max-Planck-Gesellschaft zur Förderung der Wissenschaften - MPG]
Yamamoto, Kaori [> >]
Albrecht, Renate [> >]
Pech, Markus [> >]
Nierhaus, Knud H. [> >]
2016
Proceedings of the National Academy of Sciences of the United States of America
113
9
E1180-9
Yes (verified by ORBilu)
International
0027-8424
1091-6490
United States
[en] 30S-binding initiation ; 70S-scanning initiation ; protein synthesis ; ribosomal functions ; translational initiation
[en] According to the standard model of bacterial translation initiation, the small ribosomal 30S subunit binds to the initiation site of an mRNA with the help of three initiation factors (IF1-IF3). Here, we describe a novel type of initiation termed "70S-scanning initiation," where the 70S ribosome does not necessarily dissociate after translation of a cistron, but rather scans to the initiation site of the downstream cistron. We detailed the mechanism of 70S-scanning initiation by designing unique monocistronic and polycistronic mRNAs harboring translation reporters, and by reconstituting systems to characterize each distinct mode of initiation. Results show that 70S scanning is triggered by fMet-tRNA and does not require energy; the Shine-Dalgarno sequence is an essential recognition element of the initiation site. IF1 and IF3 requirements for the various initiation modes were assessed by the formation of productive initiation complexes leading to synthesis of active proteins. IF3 is essential and IF1 is highly stimulating for the 70S-scanning mode. The task of IF1 appears to be the prevention of untimely interference by ternary aminoacyl (aa)-tRNA*elongation factor thermo unstable (EF-Tu)*GTP complexes. Evidence indicates that at least 50% of bacterial initiation events use the 70S-scanning mode, underscoring the relative importance of this translation initiation mechanism.
Researchers
http://hdl.handle.net/10993/26180
10.1073/pnas.1524554113

File(s) associated to this reference

Fulltext file(s):

FileCommentaryVersionSizeAccess
Open access
70S scanning online PNAS16.pdfPublisher postprint9.1 MBView/Open

Bookmark and Share SFX Query

All documents in ORBilu are protected by a user license.