Interactions of the TnaC nascent peptide with rRNA in the exit tunnel enable the ribosome to respond to free tryptophan.
Interactions of the TnaC nascent peptide with rRNA in the exit tunnel enable the ribosome to respond to free tryptophan.
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DOI:
10.1093/nar/gkt923
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发表时间:
2014-01
影响因子:
14.9
通讯作者:
Cruz-Vera LR
中科院分区:
文献类型:
--
作者:
Martínez AK;Gordon E;Sengupta A;Shirole N;Klepacki D;Martinez-Garriga B;Brown LM;Benedik MJ;Yanofsky C;Mankin AS;Vazquez-Laslop N;Sachs MS;Cruz-Vera LR
A transcriptional attenuation mechanism regulates expression of the bacterial tnaCAB operon. This mechanism requires ribosomal arrest induced by the regulatory nascent TnaC peptide in response to free L-tryptophan (L-Trp). In this study we demonstrate, using genetic and biochemical analyses, that in Escherichia coli, TnaC residue I19 and 23S rRNA nucleotide A2058 are essential for the ribosome’s ability to sense free L-Trp. We show that the mutational change A2058U in 23S rRNA reduces the concentration dependence of L-Trp-mediated tna operon induction, whereas the TnaC I19L change suppresses this phenotype, restoring the sensitivity of the translating A2058U mutant ribosome to free L-Trp. These findings suggest that interactions between TnaC residue I19 and 23S rRNA nucleotide A2058 contribute to the creation of a regulatory L-Trp binding site within the translating ribosome.
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DOI:
10.1016/j.bbrc.2010.01.073
发表时间:
2010-02-26
影响因子:
3.1
作者:
Ito, Koreaki;Chiba, Shinobu;Pogliano, Kit
通讯作者:
Pogliano, Kit
影响因子:
64.5
作者:
Nakatogawa, H;Ito, K
通讯作者:
Ito, K
影响因子:
56.9
作者:
Cardinale, Christopher J.;Washburn, Robert S.;Nudler, Evgeny
通讯作者:
Nudler, Evgeny
影响因子:
14.9
作者:
Martinez, Allyson K.;Shirole, Nitin H.;Cruz-Vera, Luis R.
通讯作者:
Cruz-Vera, Luis R.
影响因子:
64.5
作者:
Bollenbach T;Quan S;Chait R;Kishony R
通讯作者:
Kishony R