Regulates centrosome duplication, probably by inhibiting the kinase activity of ROCK2 (PubMed:20230755). Proposed to act as co-chaperone for HSP90 (PubMed:16083881). May play a role in the regulation of NOD1 via a HSP90 chaperone complex (PubMed:16083881). In vitro, has intrinsic chaperone activity (PubMed:20230755). This function may be achieved by inhibiting association of ROCK2 with NPM1 (PubMed:20230755). Plays a role in ensuring the localization of the tyrosine kinase receptor EGFR to the plasma membrane, and thus ensures the subsequent regulation of EGFR activity and EGF-induced actin cytoskeleton remodeling (By similarity). Involved in stress response (PubMed:20493909). Prevents tumorigenesis (By similarity). Interacts with HSP90AA1, HSP90AB1 and PPP5C. Interacts with ROCK1 and ROCK2 (By similarity). Ubiquitously expressed. Highly expressed in spleen, lung and brain (at protein level). Expressed in proliferating myoblasts and its expression remained steady after. Its expression undergoes diurnal and circadian changes in hypothalamus. Highly expressed during the dark-light transition (ZT20.5 (zeitgeber time 20.5) and ZT2.5). Weakly expressed at ZT8.5 and highly expressed at ZT14.5 at P6. At P6 highly expressed at ZT14.5 in hippocampus, prefrontal cortex and cerebellum. First detected and widely distributed at P1 and that continued throughout postnatal development. Expression is evident in the cortical plate (CP) at 17 dpc. Lower levels of expression is also evident in intermediate (IZ) and subventricular (SVZ) zones at this age. A more diffuse expression pattern is evident in early postnatal cortex with only slight differences in intensity throughout cortical layers. By P14, a more laminated distribution pattern becomes evident with a punctate distribution apparent in deep cortical layers. By Heat shock in a HSF1-dependent manner. Results in centrosome amplification and lethality. Cells become polyploid or undergo apoptosis. Embryos are no longer detected after 3.5 dpc.