Binds the RNA motif 5'-AAUAA[U/C]AUUCUU-3' in the 3'-UTR of mitochondrial mRNAs (PubMed:33876744, PubMed:10441495, PubMed:10905425). Involved in the processing or stability of mitochondrial mRNAs (PubMed:33876744, PubMed:17194787, PubMed:17194786). Monomer. Phosphorylated (PubMed:10905425). Phosphorylation promotes binding to RNA (PubMed:10905425). Abnormal meiosis. Present with 4800 molecules/cell in log phase SD medium. Belongs to the RMD9 family.