The heterodimer formed by GIMAP2 and GIMAP7 has GTPase activity. In contrast, GIMAP2 has no GTPase activity by itself. Monomer in the presence of bound GDP and in the absence of bound nucleotide. Homodimer in the presence of bound GTP. Can form linear oligomers. Heterodimer with GIMAP7. Detected in T-cells. Belongs to the TRAFAC class TrmE-Era-EngA-EngB-Septin-like GTPase superfamily. AIG1/Toc34/Toc159-like paraseptin GTPase family. IAN subfamily.