The JNK-interacting protein (JIP) group of scaffold proteins selectively mediates JNK signaling by aggregating specific components of the MAPK cascade to form a functional JNK signaling module. JIP2 inhibits IL1 beta-induced apoptosis in insulin-secreting cells. Forms homo- or heterooligomeric complexes. Binds specific components of the JNK signaling pathway namely JNK1, JNK2, JNK3, MAP2K7, MAP3K10, MAP3K11, MAP3K12 and MAPK13. Also binds the proline-rich domain-containing splice variant of apolipoprotein E receptor 2 (ApoER2). Binds the TPR motif-containing C-terminal of kinesin light chain. Binds the cytoplasmic tails of LRP1 and LRP2 (Megalin). Interacts with DCLK2. Interacts with FGF13; enables the interaction with MAPK13 and may regulate the MAPK8IP2 scaffolding activity. Interacts with TIAM1 and TIAM2 (By similarity). Interacts with SH3RF2 (PubMed:22128169). Accumulates in cell surface projections. Belongs to the JIP scaffold family.