期刊
MOLECULAR BIOSYSTEMS
卷 9, 期 6, 页码 1535-1539出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3mb25560c
关键词
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资金
- National Science Foundation [CHE0746446, CHE1213668]
- Maryland Biotechnology Award
- American Heart Association [11PRE7890040]
- Camille Dreyfus Foundation
- Jenny T. Sih Endowed Memorial Scholarship
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1213668] Funding Source: National Science Foundation
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [0746446] Funding Source: National Science Foundation
C-di-GMP is a second messenger in bacteria and partly regulates bacterial physiology by binding to class I and II riboswitches. Four class I c-di-GMP riboswitch aptamer candidates, Ct-E88, Cb-17B, Cb-E43 and Cd-630 RNAs, selected from a GEMM RNA sequence motif in the Rfam database, were expressed and experimentally verified to bind to c-di-GMP. The two newly characterized c-di-GMP riboswitches, Ct-E88 and Cb-E43, bound c-di-GMP with nanomolar K-d whereas the affinities of Cb-17B and Cd-630 for c-di-GMP were at least a 100-fold weaker. Interestingly, whereas the three riboswitches (Vc2, Et-E88 and Cb-E43) bound c-di-GMP with similar K-d values, 2'-modified analogs of c-di-GMP differentially bound to these three class I aptamers. For example, 2'-F-c-di-GMP bound Vc2 with a K-d value of 102 nM whereas the K-d value of 2'-F-c-di-GMP-Ct-E88 is 43 mu M (422 x higher than that for Vc2 RNA), revealing that there are differences in the binding sites of functional class I c-di-GMP riboswitches.
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