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 (By similarity). Forms homo- or heterooligomeric complexes. Binds specific components of the JNK signaling pathway namely JNK1, JNK2, JNK3, MAP2K7, MAP3K10, MAP3K11, MAP3K12 and MAPK13 (By similarity). 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 (PubMed:10827199, PubMed:11378392, PubMed:16628014, PubMed:19893486). Interacts with SH3RF2 (By similarity). Accumulates in cell surface projections. Highly expressed in brain. Expressed in all neurons. Also expressed in testis, primarily in the epididymal epidermis. Upon neuron differentiation. Belongs to the JIP scaffold family. Truncated C-terminus.