Adenine riboswitches and gene activation by disruption of a transcription terminator

被引:391
作者
Mandal, M [1 ]
Breaker, RR [1 ]
机构
[1] Yale Univ, Dept Mol Cellular & Dev Biol, New Haven, CT 06520 USA
关键词
D O I
10.1038/nsmb710
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
A class of riboswitches that recognizes guanine and discriminates against other purine analogs was recently identified. RNAs that carry the consensus sequence and structural features of guanine riboswitches are located in the 5' untranslated region (UTR) of numerous prokaryotic genes, where they control the expression of proteins involved in purine salvage and biosynthesis. We report that three representatives of this riboswitch class bind adenine with values for apparent dissociation constant (apparent K-d) that are several orders of magnitude lower than those for binding guanine. Because preference for adenine is attributable to a single nucleotide substitution, the RNA most likely recognizes its ligand by forming a Watson-Crick base pair. In addition, the adenine riboswitch associated with the ydhL gene of Bacillus subtilis functions as a genetic 'on' switch, wherein adenine binding causes a structural rearrangement that precludes formation of an intrinsic transcription terminator stem.
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页码:29 / 35
页数:7
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