Atypical mitochondrial nucleoside-triphosphatase (NTPase) involved in mitochondrial trafficking (PubMed:12482879, PubMed:16630562, PubMed:22396657, PubMed:30513825). Probably involved in control of anterograde transport of mitochondria and their subcellular distribution (PubMed:12482879, PubMed:16630562, PubMed:22396657). Promotes mitochondrial fission during high calcium conditions (PubMed:27716788). Can hydrolyze GTP, ATP and UTP (PubMed:30513825). {ECO:0000269|PubMed:12482879, ECO:0000269|PubMed:16630562, ECO:0000269|PubMed:22396657, ECO:0000269|PubMed:27716788, ECO:0000269|PubMed:30513825}. This is the function of RHOT1 (ras homolog family member T1, Ensembl gene identifier ENSG00000126858).