Caenorhabditis_elegansFamily: PRP8_domainIV Number of Genes: 1
Ensembl IDSymbolEntrez IDRBD RBPome PRIExpresion PathwayPhenotype ParalogOrthologGO



This domain is found in eukaryotes, and is about 20 amino acids in length. It is found associated with PF10597 PF10596 PF10598 PF08083 PF08082 PF01398 PF08084. There is a conserved LILR sequence motif. The domain is a selenomethionine domain in a subunit of the spliceosome. The function of PRP8 domain IV is believed to be interaction with the splicosomal core.


This entry represents Prp8 domain IV, which adopts a RNase H like fold within its core structure but with little sequence similarity. Pre-mRNA-splicing factor 8 (Prp8), a spliceosome protein, interacts directly with the splice sites and branch regions of precursor-mRNAs and spliceosomal RNAs associated with catalysis of the two steps of splicing. Catalysis of RNA cleavage by RNase H-like proteins involves a two-metal mechanism in which adjacently-bound divalent magnesium ions promote hydrolysis by activation of a water nucleophile and stabilization of the transition-state. However, the Prp8 domain IV contains only one of the canonical metal-binding sites and the coordinating side chains are spatially conserved with respect to Mg2+-coordinating residues within the RNase H fold [PUBMED:18836455].


  1. Ritchie DB, Schellenberg MJ, Gesner EM, Raithatha SA, Stuart DT, Macmillan AM;, Nat Struct Mol Biol. 2008;15:1199-1205.: Structural elucidation of a PRP8 core domain from the heart of the spliceosome. PUBMED:18836455 EPMC:18836455.