Folliculin-interacting protein 2 (FNIP2)

Acts as a co-chaperone of HSP90AA1.

Inhibits the ATPase activity of HSP90AA1 leading to decrease in its chaperone action.

Facilitates the binding of client protein FLCN to HSP90AA1 (PubMed:27353360). May play a role in the signal transduction pathway of apoptosis induced by O6-methylguanine- mispaired lesions (By similarity).