Ontology highlight
ABSTRACT:
SUBMITTER: Wilt HM
PROVIDER: S-EPMC7981257 | biostudies-literature | 2021 Mar
REPOSITORIES: biostudies-literature
Wilt Haley M HM Yu Ping P Tan Kemin K Wang Yun-Xing YX Stagno Jason R JR
Journal of structural biology 20210209 1
Effective gene regulation by the tetrahydrofolate riboswitch depends not only on ligand affinity but also on the kinetics of ligand association, which involves two cooperative binding sites. We have determined a 1.9-Å resolution crystal structure of the ligand-free THF riboswitch aptamer. The pseudoknot binding site 'unwinds' in the absence of ligand, whereby the adjacent helical domains (P1, P2, and P3) become disjointed, resulting in rotation and misalignment of the gene-regulatory P1 helix wi ...[more]