RNA polymerase II CTD heptapeptide repeat P3 isomerase activity
rna polymerase ii ctd heptapeptide repeat p3 isomerase activity
Catalysis of the reaction: RNA polymerase II large subunit CTD heptapeptide repeat (consensus YSPTSPS) cis-proline (omega=180) (position 3) = RNA polymerase II large subunit trans-proline (omega=0) (position 3).