4V98

The 8S snRNP Assembly Intermediate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.10 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.234 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural Basis of Assembly Chaperone- Mediated snRNP Formation.

Grimm, C.Chari, A.Pelz, J.P.Kuper, J.Kisker, C.Diederichs, K.Stark, H.Schindelin, H.Fischer, U.

(2013) Mol Cell 49: 692-703

  • DOI: 10.1016/j.molcel.2012.12.009
  • Primary Citation of Related Structures:  
    4F7U, 4V98

  • PubMed Abstract: 
  • Small nuclear ribonucleoproteins (snRNPs) represent key constituents of major and minor spliceosomes. snRNPs contain a common core, composed of seven Sm proteins bound to snRNA, which forms in a step-wise and factor-mediated reaction. The assembly chaperone pICln initially mediates the formation of an otherwise unstable pentameric Sm protein unit ...

    Small nuclear ribonucleoproteins (snRNPs) represent key constituents of major and minor spliceosomes. snRNPs contain a common core, composed of seven Sm proteins bound to snRNA, which forms in a step-wise and factor-mediated reaction. The assembly chaperone pICln initially mediates the formation of an otherwise unstable pentameric Sm protein unit. This so-called 6S complex docks subsequently onto the SMN complex, which removes pICln and enables the transfer of pre-assembled Sm proteins onto snRNA. X-ray crystallography and electron microscopy was used to investigate the structural basis of snRNP assembly. The 6S complex structure identifies pICln as an Sm protein mimic, which enables the topological organization of the Sm pentamer in a closed ring. A second structure of 6S bound to the SMN complex components SMN and Gemin2 uncovers a plausible mechanism of pICln elimination and Sm protein activation for snRNA binding. Our studies reveal how assembly factors facilitate formation of RNA-protein complexes in vivo.


    Organizational Affiliation

    Department of Biochemistry, Theodor Boveri Institute, University of Wuerzburg, Am Hubland, 97074 Wuerzburg, Germany. clemens.grimm@uni-wuerzburg.de



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Small nuclear ribonucleoprotein Sm D1119Homo sapiensMutation(s): 0 
Gene Names: SNRPD1
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Find proteins for P62314 (Homo sapiens)
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PHAROS:  P62314
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Small nuclear ribonucleoprotein Sm D2118Homo sapiensMutation(s): 0 
Gene Names: SNRPD2SNRPD1
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Find proteins for P62316 (Homo sapiens)
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PHAROS:  P62316
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Small nuclear ribonucleoprotein E92Homo sapiensMutation(s): 0 
Gene Names: SNRPE
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Find proteins for P62304 (Homo sapiens)
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Small nuclear ribonucleoprotein F86Homo sapiensMutation(s): 0 
Gene Names: SNRPFPBSCF
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
LD23602p124Drosophila melanogasterMutation(s): 0 
Gene Names: SmnCG16725Dmel_CG16725
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
CG10419247Drosophila melanogasterMutation(s): 0 
Gene Names: Gem2CG10419Dmel_CG10419
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Entity ID: 7
MoleculeChainsSequence LengthOrganismDetailsImage
Icln186Drosophila melanogasterMutation(s): 0 
Gene Names: Dmel_CG4924iclnicln-RACG4924
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Entity ID: 8
MoleculeChainsSequence LengthOrganismDetailsImage
Small nuclear ribonucleoprotein G76Homo sapiensMutation(s): 0 
Gene Names: SNRPGPBSCG
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Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.10 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.234 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 150.93α = 90
b = 356.81β = 97.31
c = 230.75γ = 90
Software Package:
Software NamePurpose
MxCuBEdata collection
PHASERphasing
BUSTERrefinement
XDSdata reduction
XDSdata scaling

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-07-09
    Type: Initial release
  • Version 1.1: 2014-12-10
    Changes: Other