Functions as a GTPase (PubMed:16209721). May act by mediating the release of NMD3 from the 60S ribosomal subunit after export into the cytoplasm during the 60S ribosomal subunit maturation (PubMed:31148378). {ECO:0000269|PubMed:16209721, ECO:0000269|PubMed:31148378}. This is the function of ENSG00000041802 (LSG1, large 60S subunit nuclear export GTPase 1).