Promotes degradation of target mRNA species. Plays a role in the regulation of circadian mRNA stability. Binds GTP and has GTPase activity. Interacts with EXOSC2/RRP4, EXOSC3/RRP40, EXOSC5/RRP46, HNRNPD, HNRNPR and SYNCRIP. Identified in a complex with HNRNPD, HNRNPL, HNRNPQ, HNRNPR, HNRNPU and AANAT mRNA, but does not bind mRNA by itself. Detected in pineal gland (at protein level). Belongs to the TRAFAC class translation factor GTPase superfamily. Classic translation factor GTPase family. GTPBP1 subfamily.