7OS1

Cryo-EM structure of Brr2 in complex with Fbp21


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

The intrinsically disordered TSSC4 protein acts as a helicase inhibitor, placeholder and multi-interaction coordinator during snRNP assembly and recycling.

Bergfort, A.Hilal, T.Kuropka, B.Ilik, I.A.Weber, G.Aktas, T.Freund, C.Wahl, M.C.

(2022) Nucleic Acids Res 50: 2938-2958

  • DOI: 10.1093/nar/gkac087
  • Primary Citation of Related Structures:  
    7OS1, 7OS2, 7PX3

  • PubMed Abstract: 
  • Biogenesis of spliceosomal small nuclear ribonucleoproteins (snRNPs) and their recycling after splicing require numerous assembly/recycling factors whose modes of action are often poorly understood. The intrinsically disordered TSSC4 protein has been identified as a nuclear-localized U5 snRNP and U4/U6-U5 tri-snRNP assembly/recycling factor, but how TSSC4's intrinsic disorder supports TSSC4 functions remains unknown ...

    Biogenesis of spliceosomal small nuclear ribonucleoproteins (snRNPs) and their recycling after splicing require numerous assembly/recycling factors whose modes of action are often poorly understood. The intrinsically disordered TSSC4 protein has been identified as a nuclear-localized U5 snRNP and U4/U6-U5 tri-snRNP assembly/recycling factor, but how TSSC4's intrinsic disorder supports TSSC4 functions remains unknown. Using diverse interaction assays and cryogenic electron microscopy-based structural analysis, we show that TSSC4 employs four conserved, non-contiguous regions to bind the PRPF8 Jab1/MPN domain and the SNRNP200 helicase at functionally important sites. It thereby inhibits SNRNP200 helicase activity, spatially aligns the proteins, coordinates formation of a U5 sub-module and transiently blocks premature interaction of SNRNP200 with at least three other spliceosomal factors. Guided by the structure, we designed a TSSC4 variant that lacks stable binding to the PRPF8 Jab1/MPN domain or SNRNP200 in vitro. Comparative immunoprecipitation/mass spectrometry from HEK293 nuclear extract revealed distinct interaction profiles of wild type TSSC4 and the variant deficient in PRPF8/SNRNP200 binding with snRNP proteins, other spliceosomal proteins as well as snRNP assembly/recycling factors and chaperones. Our findings elucidate molecular strategies employed by an intrinsically disordered protein to promote snRNP assembly, and suggest multiple TSSC4-dependent stages during snRNP assembly/recycling.


    Related Citations: 
    • Macromolecular structure determination using X-rays, neutrons and electrons: recent developments in Phenix.
      Liebschner, D., Afonine, P.V., Baker, M.L., Bunkoczi, G., Chen, V.B., Croll, T.I., Hintze, B., Hung, L.W., Jain, S., McCoy, A.J., Moriarty, N.W., Oeffner, R.D., Poon, B.K., Prisant, M.G., Read, R.J., Richardson, J.S., Richardson, D.C., Sammito, M.D., Sobolev, O.V., Stockwell, D.H., Terwilliger, T.C., Urzhumtsev, A.G., Videau, L.L., Williams, C.J., Adams, P.D.
      (2019) Acta Crystallogr D Struct Biol 75: 861

    Organizational Affiliation

    Helmholtz-Zentrum Berlin für Materialien und Energie, Macromolecular Crystallography, Albert-Einstein-Str. 15, D-12489 Berlin, Germany.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
U5 small nuclear ribonucleoprotein 200 kDa helicaseA [auth B]1,739Homo sapiensMutation(s): 0 
Gene Names: SNRNP200ASCC3L1HELIC2KIAA0788
EC: 3.6.4.13
UniProt & NIH Common Fund Data Resources
Find proteins for O75643 (Homo sapiens)
Explore O75643 
Go to UniProtKB:  O75643
PHAROS:  O75643
Entity Groups  
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UniProt GroupO75643
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
WW domain-binding protein 4B [auth F]184Homo sapiensMutation(s): 0 
Gene Names: WBP4FBP21FNBP21
UniProt & NIH Common Fund Data Resources
Find proteins for O75554 (Homo sapiens)
Explore O75554 
Go to UniProtKB:  O75554
PHAROS:  O75554
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO75554
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
German Research Foundation (DFG)GermanyTRR186-A15

Revision History  (Full details and data files)

  • Version 1.0: 2022-02-23
    Type: Initial release
  • Version 1.1: 2022-03-02
    Changes: Database references
  • Version 1.2: 2022-03-30
    Changes: Database references