This family includes a region that lies towards the C-terminus of the cleavage and polyadenylation specificity factor (CPSF) A (160 kDa) subunit. CPSF is involved in mRNA polyadenylation and binds the AAUAAA conserved sequence in pre-mRNA. CPSF has also been found to be necessary for splicing of single-intron pre-mRNAs [1]. The function of the aligned region is unknown but may be involved in RNA/DNA binding.

1: The 3'-end-processing factor CPSF is required for the splicing of single-intron pre-mRNAs in vivo. Li Y, Chen ZY, Wang W, Baker CC, Krug RM; RNA 2001;7:920-931. PMID:11421366