Abstract:
:Initiation of translation involves recognition of the start codon by the initiator tRNA in the 30S subunit. To investigate the role of ribosomal RNA (rRNA) in this process, we isolated a number of 16S rRNA mutations that increase translation from the non-canonical start codon AUC. These mutations cluster to distinct regions that overlap remarkably well with previously identified class III protection sites and implicate both IF1 and IF3 in start codon selection. Two mutations map to the 790 loop and presumably act by inhibiting IF3 binding. Another cluster of mutations surrounds the conserved A1413(o)G1487 base pair of helix 44 in a region known to be distorted by IF1 and IF3. Site-directed mutagenesis in this region confirmed that this factor-induced rearrangement of helix 44 helps regulate initiation fidelity. A third cluster of mutations maps to the neck of the 30S subunit, suggesting that the dynamics of the head domain influences translation initiation. In addition to identifying mutations that decrease fidelity, we found that many P-site mutations increase the stringency of start codon selection. These data provide evidence that the interaction between the initiator tRNA and the 30S P site is tuned to balance efficiency and accuracy during initiation.
journal_name
Mol Microbioljournal_title
Molecular microbiologyauthors
Qin D,Fredrick Kdoi
10.1111/j.1365-2958.2009.06598.xsubject
Has Abstractpub_date
2009-03-01 00:00:00pages
1239-49issue
5eissn
0950-382Xissn
1365-2958pii
MMI6598journal_volume
71pub_type
杂志文章abstract::Ustilago maydis, the causal agent of corn smut disease, displays dimorphic growth in which it alternates between a budding haploid saprophyte and a filamentous dikaryotic pathogen. We are interested in identifying the genetic determinants of filamentous growth and pathogenicity in U. maydis. To do this, we have taken ...
journal_title:Molecular microbiology
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pub_type: 杂志文章
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更新日期:1999-04-01 00:00:00
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journal_title:Molecular microbiology
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journal_title:Molecular microbiology
pub_type: 杂志文章
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更新日期:2010-12-01 00:00:00
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更新日期:2003-03-01 00:00:00
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journal_title:Molecular microbiology
pub_type: 杂志文章
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更新日期:2003-04-01 00:00:00
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更新日期:2008-02-01 00:00:00
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pub_type: 杂志文章,评审
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更新日期:2009-05-01 00:00:00
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journal_title:Molecular microbiology
pub_type: 杂志文章
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更新日期:2011-03-01 00:00:00
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