KH-R3H domain cooperation in RNA recognition by the global RNA-binding protein KhpB.

ABSTRACT: KhpB, also known as EloR, is a recently discovered global RNA-binding protein in various pathogenic bacteria that regulates critical cellular processes. KhpB is unique in containing both an R3H domain and a KH domain, which are universal RNA/DNA-binding domains found across various proteins involved in diverse cellular functions. However, the precise roles of these domains in KhpB's RNA-binding mechanism remain unclear, particularly as no structural data of the R3H domain bound to RNA/DNA have been reported for any protein. In this study, we present the crystal structures of both the RNA-free and RNA-bound forms of Thermus thermophilus KhpB dimer. These structures reveal that the KH and R3H domains cooperate to form a composite RNA-binding site capable of binding a single RNA molecule. Not

SUBMITTER: Fukui K 

PROVIDER: S-EPMC12408800 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature