PPIase that catalyzes the cis-trans isomerization of proline imidic peptide bonds in oligopeptides and may therefore assist protein folding . May be implicated in the folding, transport, and assembly of proteins. May play an important role in the regulation of pre-mRNA splicing.
Subcellular locations: Nucleus matrix, Nucleus speckle
Colocalizes with RNA splicing factors at nuclear speckles.
Ubiquitous.