Biochemical Reagents, UHMCP1, Spliceosome modulator, CAS Unknown, 97% by HPLC/NMR (Conforms), UHMCP1 prevents the interaction (KD 80 uM) between the splicing factor SF3b155 and U2AF homology motif domain (UHM) U2AF65.1 The spliceosomal gene SF3B1 (which encodes for SF3b155) is frequently mutated in cancers as is the splicing factor U2AF.2 UHMCP1 displaying toxicity against HEK293 cells (EC50 140 uM) and various effects on pre-mRNA accumulation or intron retention, exon skipping and inclusion.1 An interesting new tool for study of the spliceosome.