5LSB

Crystal structure of yeast Hsh49p in complex with Cus1p binding domain.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.184 

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This is version 1.1 of the entry. See complete history

Literature

Crystal structure of U2 snRNP SF3b components: Hsh49p in complex with Cus1p-binding domain.

van Roon, A.M.Oubridge, C.Obayashi, E.Sposito, B.Newman, A.J.Seraphin, B.Nagai, K.

(2017) RNA 23: 968-981

  • DOI: 10.1261/rna.059378.116
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Spliceosomal proteins Hsh49p and Cus1p are components of SF3b, which together with SF3a, Msl1p/Lea1p, Sm proteins, and U2 snRNA, form U2 snRNP, which plays a crucial role in pre-mRNA splicing. Hsh49p, comprising two RRMs, forms a heterodimer with Cus ...

    Spliceosomal proteins Hsh49p and Cus1p are components of SF3b, which together with SF3a, Msl1p/Lea1p, Sm proteins, and U2 snRNA, form U2 snRNP, which plays a crucial role in pre-mRNA splicing. Hsh49p, comprising two RRMs, forms a heterodimer with Cus1p. We determined the crystal structures of Saccharomyces cerevisiae full-length Hsh49p as well as its RRM1 in complex with a minimal binding region of Cus1p (residues 290-368). The structures show that the Cus1 fragment binds to the α-helical surface of Hsh49p RRM1, opposite the four-stranded β-sheet, leaving the canonical RNA-binding surface available to bind RNA. Hsh49p binds the 5' end region of U2 snRNA via RRM1. Its affinity is increased in complex with Cus1(290-368)p, partly because an extended RNA-binding surface forms across the protein-protein interface. The Hsh49p RRM1-Cus1(290-368)p structure fits well into cryo-EM density of the Bact spliceosome, corroborating the biological relevance of our crystal structure.


    Organizational Affiliation

    MRC Laboratory of Molecular Biology, Cambridge CB2 0QH, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Protein HSH49
A, C, F
215Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: HSH49
Find proteins for Q99181 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  Q99181
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Cold sensitive U2 snRNA suppressor 1
B, D, H
84Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: CUS1
Find proteins for Q02554 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  Q02554
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.184 
  • Space Group: P 32
Unit Cell:
Length (Å)Angle (°)
a = 142.083α = 90.00
b = 142.083β = 90.00
c = 40.355γ = 120.00
Software Package:
Software NamePurpose
PHASERphasing
XDSdata reduction
Aimlessdata scaling
PDB_EXTRACTdata extraction
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2017-04-12
    Type: Initial release
  • Version 1.1: 2017-05-24
    Type: Database references