5DCA

Crystal structure of yeast full length Brr2 in complex with Prp8 Jab1 domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.205 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

The large N-terminal region of the Brr2 RNA helicase guides productive spliceosome activation.

Absmeier, E.Wollenhaupt, J.Mozaffari-Jovin, S.Becke, C.Lee, C.T.Preussner, M.Heyd, F.Urlaub, H.Luhrmann, R.Santos, K.F.Wahl, M.C.

(2015) Genes Dev 29: 2576-2587

  • DOI: 10.1101/gad.271528.115
  • Primary Citation of Related Structures:  
    5DCA

  • PubMed Abstract: 
  • The Brr2 helicase provides the key remodeling activity for spliceosome catalytic activation, during which it disrupts the U4/U6 di-snRNP (small nuclear RNA protein), and its activity has to be tightly regulated. Brr2 exhibits an unusual architecture, including an ∼ 500-residue N-terminal region, whose functions and molecular mechanisms are presently unknown, followed by a tandem array of structurally similar helicase units (cassettes), only the first of which is catalytically active ...

    The Brr2 helicase provides the key remodeling activity for spliceosome catalytic activation, during which it disrupts the U4/U6 di-snRNP (small nuclear RNA protein), and its activity has to be tightly regulated. Brr2 exhibits an unusual architecture, including an ∼ 500-residue N-terminal region, whose functions and molecular mechanisms are presently unknown, followed by a tandem array of structurally similar helicase units (cassettes), only the first of which is catalytically active. Here, we show by crystal structure analysis of full-length Brr2 in complex with a regulatory Jab1/MPN domain of the Prp8 protein and by cross-linking/mass spectrometry of isolated Brr2 that the Brr2 N-terminal region encompasses two folded domains and adjacent linear elements that clamp and interconnect the helicase cassettes. Stepwise N-terminal truncations led to yeast growth and splicing defects, reduced Brr2 association with U4/U6•U5 tri-snRNPs, and increased ATP-dependent disruption of the tri-snRNP, yielding U4/U6 di-snRNP and U5 snRNP. Trends in the RNA-binding, ATPase, and helicase activities of the Brr2 truncation variants are fully rationalized by the crystal structure, demonstrating that the N-terminal region autoinhibits Brr2 via substrate competition and conformational clamping. Our results reveal molecular mechanisms that prevent premature and unproductive tri-snRNP disruption and suggest novel principles of Brr2-dependent splicing regulation.


    Organizational Affiliation

    Laboratory of Structural Biochemistry, Freie Universität Berlin, D-14195 Berlin, Germany;



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Pre-mRNA-splicing helicase BRR2A1948Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: BRR2RSS1SNU246YER172CSYGP-ORF66
EC: 3.6.4.13
UniProt
Find proteins for P32639 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P32639 
Go to UniProtKB:  P32639
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP32639
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Pre-mRNA-splicing factor 8B [auth J]251Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: PRP8DBF3DNA39RNA8SLT21USA2YHR165C
UniProt
Find proteins for P33334 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P33334 
Go to UniProtKB:  P33334
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP33334
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.205 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 107.85α = 90
b = 178.85β = 90
c = 181.11γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XDSdata scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-12-16
    Type: Initial release
  • Version 1.1: 2015-12-30
    Changes: Database references
  • Version 1.2: 2018-03-07
    Changes: Data collection