The splicesome is the molecular machine responsible for catalyzing intron removal from pre-mRNA transcripts. The splicesome is composed of several small nuclear RNAs (snRNAs) complexed with their associated proteins [together termed snRNPs (small nuclear ribonucleoprotein)]. One of the major classes of snRNPs includes the U1, U2, U4, U5 and U6 snRNP. EFTUD2/SNRP116 is a component of the U5 snRNP. EFTUD2/SNRP116 is a GTPase that may play a role in disrupting U4/U6 helices prior to splicesome activation.