Cyclophilin H (also known as peptidylpropyl isomerase H, PPIH) is a member of peptidyl-propyl cis-trans isomerase (PPIase) family, which catalyzes the cis-trans isomerization of proline imidic peptide bonds in oligopeptides and accelerates the folding of proteins. The cyclophilin H is a specific component of the human U4/U6 small nuclear ribonucleoprotein particle involved in the nuclear splicing of pre-mRNA. It stably associates with the U4/U6-60kD and -90kD proteins, the human orthologues of the Saccharomyces cerevisiae Prp4 and Prp3 splicing factors. Recombinant human cyclophilin H was expressed in E.coli and purified by conventional chromatography techniques. Synonyms: Peptidylprolyl isomerase H, PPIH, CYPH, CYP20, SnuCyp-20, SnuCyp-20, PPIase H, Rotamase H, Cyclophilin H , Peptidylprolyl isomerase H CypH, EC 5.2.1.8, MGC5016, Small nuclear ribonucleoprotein particle-specific cyclophilin H, USACYP, UsnRNP associated cyclophilin SnuCyp20,. NCBI no.: NP_006338