CF II CF I intronless pre-mRNA cleavage complex CstF:CPSF:capped intronless pre-mRNA:CBC complex Binding of Cleavage factors and Poly(A)Polymerase to the CstF:CPSF:Pre-mRNA Complex Authored: Wahle, E, 2003-06-05 08:30:31 CF I, which appears to be composed of two subunits, one of several related larger polypeptides and a common smaller one, also binds RNA, but with unknown specificity. RNA recognition by these proteins is cooperative. Cleavage also requires CF II, composed of at least two subunits, and poly(A) polymerase, the enzyme synthesizing the poly(A) tail in the second step of the reaction. Edited: Gillespie, ME, 0000-00-00 00:00:00 Pubmed10371034 Reactome Database ID Release 4377591 Reactome, http://www.reactome.org ReactomeREACT_1724