Solution NMR determination of hydrogen bonding and base pairing between the glyQS T box riboswitch Specifier domain and the anticodon loop of tRNA(Gly).

Solution NMR determination of hydrogen bonding and base pairing between the glyQS T box riboswitch Specifier domain and the anticodon loop of tRNA(Gly).
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DOI:
10.1016/j.febslet.2013.09.003
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发表时间:
2013-11-01
期刊:
影响因子:
3.5
通讯作者:
Nikonowicz EP
Nikonowicz EP
中科院分区:
生物学3区
文献类型:
--
作者:
Chang AT;Nikonowicz EP

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In Gram-positive bacteria the tRNA-dependent T box riboswitch regulates the expression of many amino acid biosynthetic and aminoacyl-tRNA synthetase genes through a transcription attenuation mechanism. The Specifier domain of the T box riboswitch contains the Specifier sequence that is complementary to the tRNA anticodon and is flanked by a highly conserved purine nucleotide that could result in a fourth base pair involving the invariant U33 of tRNA. We show that the interaction between the T box Specifier domain and tRNA consists of three Watson-Crick base pairs and that U33 confers stability to the complex through intramolecular hydrogen bonding. Enhanced packing within the Specifier domain loop E motif may stabilize the complex and contribute to cognate tRNA selection.
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