C merolae U4 snRNP protein Snu13

Experimental Data Snapshot

  • Resolution: 2.35 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.166 
  • R-Value Observed: 0.169 

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Conserved structure of Snu13 from the highly reduced spliceosome of Cyanidioschyzon merolae.

Black, C.S.Garside, E.L.MacMillan, A.M.Rader, S.D.

(2016) Protein Sci 25: 911-916

  • DOI: https://doi.org/10.1002/pro.2894
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Structural and functional analysis of proteins involved in pre-mRNA splicing is challenging because of the complexity of the splicing machinery, known as the spliceosome. Bioinformatic, proteomic, and biochemical analyses have identified a minimal spliceosome in the red alga Cyanidioschyzon merolae. This spliceosome consists of only 40 core proteins, compared to ∼ 70 in S. cerevisiae (yeast) and ∼ 150 in humans. We report the X-ray crystallographic analysis of C. merolae Snu13 (CmSnu13), a key component of the assembling spliceosome, and present evidence for conservation of Snu13 function in this algal splicing pathway. The near identity of CmSnu13's three-dimensional structure to yeast and human Snu13 suggests that C. merolae should be an excellent model system for investigating the structure and function of the conserved core of the spliceosome.

  • Organizational Affiliation

    Department of Chemistry, University of Northern British Columbia, Prince George, British Columbia, V2N 4Z9, Canada.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Box C/D snoRNP and U4 snRNP component Snu13p146Cyanidioschyzon merolaeMutation(s): 0 
Gene Names: CYME_CMP335C
Find proteins for M1VFX0 (Cyanidioschyzon merolae (strain NIES-3377 / 10D))
Explore M1VFX0 
Go to UniProtKB:  M1VFX0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupM1VFX0
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.35 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.166 
  • R-Value Observed: 0.169 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 30.33α = 90
b = 57.582β = 90
c = 65.38γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data scaling
PDB_EXTRACTdata extraction
HKL-2000data reduction

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-04-20
    Type: Initial release
  • Version 1.1: 2023-09-27
    Changes: Data collection, Database references, Derived calculations, Refinement description