Inhibitor of the serine/threonine-protein kinase PAK4 (PubMed:26607847). Acts by binding PAK4 in a substrate-like manner, inhibiting the protein kinase activity (PubMed:26607847). Interacts with PAK4 (PubMed:26607847). Mainly nuclear (PubMed:26607847). Relocalizes to the cytoplasm following interaction with PAK4 (PubMed:26607847). Contains 2 Inka boxes (also named iBox or inca box) (PubMed:26607847). The Inka boxes bind and inhibit PAK4 by binding a substrate-like manner (PubMed:26607847). Belongs to the INKA family. It is uncertain whether Met-1 or Met-3 is the initiator.