Possibly has a role in RNA transcription or processing during stress (By similarity). Binds RNAs and DNAs sequence with a preference to single-stranded nucleic acids. Displays strong affinity to poly(U) sequence (PubMed:11972043). Involved in C-to-U editing of mitochondrial RNA. Functions as major mitochondrial editing factor. Controls 44 percent of the mitochondrial editing sites (PubMed:26578708). Homodimer (PubMed:26578708). Interacts with MORF8/RIP1 AND RBG3/ORRM3 (PubMed:26578708). Binds to RBG2/ORRM5 (PubMed:28549172). Reduced growth rate and delayed flowering. Belongs to the GR-RBP family.