Atypical Ras-like protein that acts as a potent regulator of NF-kappa-B activity by preventing the degradation of NF-kappa-B inhibitor beta (NFKBIB) by most signals, explaining why NFKBIB is more resistant to degradation. In contrast to other members of the Ras family, the members of the KappaB-Ras subfamily do not contain the conserved Gln residues in position and 65, which is replaced by a Leu residue, and are therefore similar to the constitutively active forms of oncogenic forms of Ras. This suggests that members of this family are clearly different from other small GTPases proteins. Belongs to the small GTPase superfamily. Ras family. KappaB-Ras subfamily.