Open and closed forms of T1791P+R1865A human PRP8 RNase H-like domain with bound Mg ion

Experimental Data Snapshot

  • Resolution: 1.95 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.189 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


A conformational switch in PRP8 mediates metal ion coordination that promotes pre-mRNA exon ligation.

Schellenberg, M.J.Wu, T.Ritchie, D.B.Fica, S.Staley, J.P.Atta, K.A.Lapointe, P.Macmillan, A.M.

(2013) Nat Struct Mol Biol 20: 728-734

  • DOI: https://doi.org/10.1038/nsmb.2556
  • Primary Citation of Related Structures:  
    4JK7, 4JK8, 4JK9, 4JKA, 4JKB, 4JKC, 4JKD, 4JKE, 4JKF, 4JKG, 4JKH

  • PubMed Abstract: 

    Splicing of pre-mRNAs in eukaryotes is catalyzed by the spliceosome, a large RNA-protein metalloenzyme. The catalytic center of the spliceosome involves a structure comprising the U2 and U6 snRNAs and includes a metal bound by U6 snRNA. The precise architecture of the splicesome active site, however, and the question of whether it includes protein components, remains unresolved. A wealth of evidence places the protein PRP8 at the heart of the spliceosome through assembly and catalysis. Here we provide evidence that the RNase H domain of PRP8 undergoes a conformational switch between the two steps of splicing, rationalizing yeast prp8 alleles that promote either the first or second step. We also show that this switch unmasks a metal-binding site involved in the second step. Together, these data establish that PRP8 is a metalloprotein that promotes exon ligation within the spliceosome.

  • Organizational Affiliation

    Department of Biochemistry, University of Alberta, Edmonton, Alberta, Canada.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Pre-mRNA-processing-splicing factor 8
A, B
222Homo sapiensMutation(s): 2 
Gene Names: PRP8PRPC8PRPF8
UniProt & NIH Common Fund Data Resources
Find proteins for Q6P2Q9 (Homo sapiens)
Explore Q6P2Q9 
Go to UniProtKB:  Q6P2Q9
GTEx:  ENSG00000174231 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ6P2Q9
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on MG

Download Ideal Coordinates CCD File 
Experimental Data & Validation

Experimental Data

  • Resolution: 1.95 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.189 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 76.171α = 90
b = 77.253β = 90
c = 93.601γ = 90
Software Package:
Software NamePurpose
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
ADSCdata collection
DENZOdata reduction

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-05-22
    Type: Initial release
  • Version 1.1: 2013-06-19
    Changes: Database references
  • Version 1.2: 2013-06-26
    Changes: Database references
  • Version 1.3: 2023-09-20
    Changes: Data collection, Database references, Derived calculations, Refinement description