共查询到20条相似文献,搜索用时 15 毫秒
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Yusuf D Butland SL Swanson MI Bolotin E Ticoll A Cheung WA Zhang XY Dickman CT Fulton DL Lim JS Schnabl JM Ramos OH Vasseur-Cognet M de Leeuw CN Simpson EM Ryffel GU Lam EW Kist R Wilson MS Marco-Ferreres R Brosens JJ Beccari LL Bovolenta P Benayoun BA Monteiro LJ Schwenen HD Grontved L Wederell E Mandrup S Veitia RA Chakravarthy H Hoodless PA Mancarelli MM Torbett BE Banham AH Reddy SP Cullum RL Liedtke M Tschan MP Vaz M Rizzino A Zannini M Frietze S Farnham PJ Eijkelenboom A Brown PJ 《Genome biology》2012,13(3):R24
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A recently discovered class of gene regulatory RNAs, coined riboswitches, are commonly found in noncoding segments of bacterial and some eukaryotic mRNAs. Gene up- or down-regulation is triggered by binding of a small organic metabolite, which typically induces an RNA conformational change. Unique among these noncoding RNAs is the glmS catalytic riboswitch, or ribozyme, found in the 5'-untranslated region of the glmS gene in Gram-positive bacteria. It is activated by glucosamine-6-phosphate (GlcN6P), leading to site-specific backbone cleavage of the mRNA and subsequent repression of the glmS gene, responsible for cellular GlcN6P production. Recent biochemical and structural evidence suggests that the GlcN6P ligand acts as a coenzyme and participates in the cleavage reaction without inducing a conformational change. To better understand the role of GlcN6P in solution structural dynamics and function, we have separated the glmS riboswitch core from Bacillus subtilis into a trans-cleaving ribozyme and an externally cleaved substrate. We find that trans cleavage is rapidly activated by nearly 5000-fold to a rate of 4.4 min(-1) upon addition of 10 mM GlcN6P, comparable to the cis-acting ribozyme. Fluorescence resonance energy transfer suggests that this ribozyme-substrate complex does not undergo a global conformational change upon ligand binding in solution. In addition, footprinting at nucleotide resolution using terbium(III) and RNase V1 indicates no significant changes in secondary and tertiary structure upon ligand binding. These findings suggest that the glmS ribozyme is fully folded in solution prior to binding its activating ligand, supporting recent observations in the crystalline state. 相似文献
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The ETS-domain transcription factor family 总被引:2,自引:0,他引:2
Andrew D. Sharrocks A.Louise Brown Yan Ling Paula R. Yates 《The international journal of biochemistry & cell biology》1997,29(12):1371-1387
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《Trends in plant science》2022,27(11):1087-1089