Cryo-EM structures of CCHFV polymerase reveal a stepwise initiation stabilization pathway and a dual-site inhibition mechanism.
Crimean-Congo hemorrhagic fever virus (CCHFV) is a high-priority pathogen with high case-fatality rates, yet approved therapeutics remain unavailable. The CCHFV L segment encodes a ∼450-kDa RNA-dependent RNA polymerase (L protein) orchestrating viral replication, but its structural mechanisms remain elusive. Here, we p...