May regulate lymphocyte survival. Required for normal levels of mature T-lymphocytes and mature B-cells (By similarity). Predominantly expressed in the spleen and to a lesser extent in the lymph nodes. 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.