PPIase that catalyzes the cis-trans isomerization of proline imidic peptide bonds in oligopeptides and may therefore assist protein folding . Participates in pre-mRNA splicing. May play a role in the assembly of the U4/U5/U6 tri-snRNP complex, one of the building blocks of the spliceosome. May act as a chaperone.
Nucleus speckle . Cytoplasm . Colocalizes with spliceosomal snRNPs. A small proportion may also be cytoplasmic.
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