This domain is found in RLIP76 (also known as RalA-binding protein 1, RalBP1), a multifunctional protein that interacts with multiple small G protein families and endocytosis proteins. The Ral binding domain is a coiled-coil. The orientation of its alpha-helices and the loop between them slightly changes upon binding to RalB. This interaction appears to be related to the cellular localization of the complex [1-3].

1: The RalB-RLIP76 complex reveals a novel mode of ral-effector interaction. Fenwick RB, Campbell LJ, Rajasekar K, Prasannan S, Nietlispach D, Camonis J, Owen D, Mott HR; Structure. 2010;18:985-995. PMID:20696399

2: The structure of the RLIP76 RhoGAP-Ral binding domain dyad: fixed position of the domains leads to dual engagement of small G proteins at the membrane. Rajasekar KV, Campbell LJ, Nietlispach D, Owen D, Mott HR; Structure. 2013;21:2131-2142. PMID:24207123

3: Affinity maturation of the RLIP76 Ral binding domain to inform the design of stapled peptides targeting the Ral GTPases. Hurd CA, Brear P, Revell J, Ross S, Mott HR, Owen D; J Biol Chem. 2021;296:100101. PMID:33214225