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Sequence, structure, and stacking 期刊论文

作者: Jason C Grigg Ailong Ke
发表时间:2013

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作者 : Jason C Grigg ;   Ailong Ke ;  
ISSN : 1547-6286;1555-8584;
出版时间 : 2013
卷期 : 10(12)
起始页码 : 1761
终止页码 : 1764
摘要 : The term riboswitch usually refers to small molecule sensing regulatory modules in the 5′ untranslated regions of a mRNA. They are typically comprised of separate ligand binding and regulatory domains. The T box riboswitch is unique from other identified riboswitches because its effector is an essential macromolecule, tRNA. It senses the aminoacylation state of tRNA to regulate genes involved in a variety of functions relating to amino acid metabolism and tRNA aminoacylation. T box riboswitches performs an intuitively simple process using a complex structured RNA element and, until recently, the underlying mechanisms were poorly understood. Only two sequence-specific contacts had been previously identified: (1) between the specifier sequence (codon) and the tRNA anticodon and (2) between an anti-terminator stem loop and the tRNA acceptor arm CCA tail. tRNA aminoacylation blocks the latter interaction and therefore serves as the switch between termination and anti-termination. Outside of these two contacts, the structure and functions of T box riboswitches have come to light in some recent studies. We recently described the X-ray crystal structure of the highly conserved T box riboswitch distal Stem I region and demonstrated that this region interacts with the tRNA elbow to anchor it to the riboswitch. Independently, Lehmann et al. used sequence homology search to arrive at a similar model for Stem I-tRNA interactions. The model was further supported by two recent structures of the Stem I-tRNA complex, determined independently by our group and by Zhang and Ferré-D’Amaré. This article highlights some of these contributions to synthesize an updated model for tRNA recognition by the T box riboswitch.

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