Ontology highlight
ABSTRACT:
SUBMITTER: Knappenberger AJ
PROVIDER: S-EPMC6031431 | biostudies-literature | 2018 Jun
REPOSITORIES: biostudies-literature
Knappenberger Andrew John AJ Reiss Caroline Wetherington CW Strobel Scott A SA
eLife 20180607
Two classes of riboswitches related to the <i>ykkC</i> guanidine-I riboswitch bind phosphoribosyl pyrophosphate (PRPP) and guanosine tetraphosphate (ppGpp). Here we report the co-crystal structure of the PRPP aptamer and its ligand. We also report the structure of the G96A point mutant that prefers ppGpp over PRPP with a dramatic 40,000-fold switch in specificity. The ends of the aptamer form a helix that is not present in the guanidine aptamer and is involved in the expression platform. In the ...[more]