This is the second leucine zipper domain (LZII) of several JNK-interacting proteins (JIP). It interacts with the small GTP-binding protein ARF6 [1].

1: The structural basis of Arf effector specificity: the crystal structure of ARF6 in a complex with JIP4. Isabet T, Montagnac G, Regazzoni K, Raynal B, El Khadali F, England P, Franco M, Chavrier P, Houdusse A, Menetrey J; EMBO J. 2009;28:2835-2845. PMID:19644450