Small GTPase that may be involved in genome maintenance. Has weak intrinsic GTPase activity but displays no ATPase activity. Homodimer (PubMed:16510996). Interacts with DNA topoisomerase VI subunit B (top6B), DNA primase DnaG and RF-C (PubMed:17468740). Belongs to the GPN-loop GTPase family. Extended N-terminus.