Inhibition of fusidic acid resistance through restricting conformational flexibility in domain III of EF-G.

ABSTRACT: Fusidic acid (FA) is one of few remaining antibiotics active against Methicillin-resistant Staphylococcus aureus. FusB confers resistance to FA by rescuing the translocation factor Elongation Factor-G (EF-G) from FA-stalled ribosome complexes. FusB induces allosteric effects on dynamics in EF-G, causing significant changes in the conformational flexibility of domain III that result in an increase in a minor, more disordered state, overcoming the steric block induced by FA. We show that restraining flexibility in the two central β-strands of EF-G domain III prevents the FusB-induced increase in this minor state population, preventing FusB-mediated release of EF-G from the ribosome and thereby reinstating FA-induced stalling of protein synthesis. We further identify a region controlli

SUBMITTER: Schindl A 

PROVIDER: S-EPMC12685103 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature