S1_YloQ_GTPase: YloQ GTase family (also known as YjeQ and CpgA), S1-like RNA-binding domain. Proteins in the YloQ GTase family bind the ribosome and have GTPase activity. The precise role of this family is unknown. The protein structure is composed of three domains: an N-terminal S1 domain, a central GTPase domain, and a C-terminal zinc finger domain. This N-terminal S1 domain binds ssRNA. The central GTPase domain contains nucleotide-binding signature motifs: G1 (walker A), G3 (walker B) and G4 motifs. Experiments show that the bacterial YloQ and YjeQ proteins have low intrinsic GTPase activity. The C-terminal zinc-finger domain has structural similarity to a portion of the DNA-repair protein Rad51. This suggests a possible role for this GTPase as a regulator of translation, perhaps as a translation initiation factor. This family is classified based on the N-terminal S1 domain.
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