Acts as co-chaperone regulating the molecular chaperones HSP70 and HSP90 in folding of steroid receptors, such as the glucocorticoid receptor and the progesterone receptor. Proposed to act as a recycling chaperone by facilitating the return of chaperone substrates to early stages of chaperoning if further folding is required. In vitro, induces ATP-independent dissociation of HSP90 but not of HSP70 from the chaperone-substrate complexes. Recruits NR1I3 to the cytoplasm (By similarity). Associates with complexes containing chaperones HSP70 and HSP90. Interacts with the GAP domain of NF1. Interacts with HSP90AA1. Interacts with HSPA1A/B; the interaction is enhanced by ATP. Interacts with HSP90AB1. Interacts with PGR. Interacts with RAD9A; the interaction is interrupted by UV and heat shock treatments. Interacts with HUS1 and RAD1. Interacts with NR1I3; this complex may also include HSP90. Interacts with HSPA8 (By similarity).