GPN-loop GTPase 2, or, GPN2, is a human gene. Other names include: ATP-binding domain 1 family member B; ATPBD1B. The encoded protein has an amino acid length of 310 and a mass of 34.6 kDa. Other isoforms may exist. GPN-loop GTPase 2 is a member of the GPN-loop GTPase family. This gene shares homology with other species, including: Mouse, Yeast, Rat, Zebrafish, Frog, Chicken.