Acts as a co-chaperone for HSP90 (PubMed:20349287). Controls root development through the modulation of auxin distribution in the root meristem (PubMed:26163704). Interacts with HSP90 in an ATP-dependent manner (PubMed:20349287). Interacts with HSP90-5, HSP90-6 and HSP90-7 (PubMed:20493581). Widely expressed but preferentially in the root meristem. Inhibited by heat shock treatment. Short root length. Impaired cell division in the root meristem. Belongs to the p23/wos2 family.