PPIases accelerate the folding of proteins. It catalyzes the cis-trans isomerization of proline imidic peptide bonds in oligopeptides (By similarity). Co-chaperone that positively modulates thermotolerance by interacting with HSP90.1 and increasing the HSFA2-mediated accumulation of chaperones of the small-HSPs family. [protein]-peptidylproline (omega=180) = [protein]-peptidylproline (omega=0) This PPIase probably binds calmodulin. Interacts with HSP90-1. Forms heterodimers with FKBP65/ROF2. Relocalization from the cytoplasm into the nucleus is induced by heat shock and in association with HSFA2. A number of isoforms are produced. According to EST sequences. Expressed at low levels in roots, stems, leaves and flowers. Detected in the vascular elements of roots, in hydathodes and trichomes of leaves and in stigma, sepals, and anthers. By wounding, NaCl and by heat shock. Belongs to the FKBP-type PPIase family.