1H6K

nuclear Cap Binding Complex

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.203 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history. 


Literature

Crystal Structure of the Human Nuclear CAP Binding Complex

Mazza, C., Ohno, M., Segref, A., Mattaj, I.W., Cusack, S.

(2001) Mol Cell 8: 383

  • DOI: 10.1016/s1097-2765(01)00299-4
  • Primary Citation of Related Structures:  
    1H6K

  • PubMed Abstract: 

    • The heterodimeric nuclear cap binding complex (CBC) binds to 5'-capped polymerase II transcripts. It enhances the efficiency of several mRNA maturation steps and is essential for U snRNA nuclear export in multicellular eukaryotes. The 2A crystal structure of human CBC shows that the large subunit, CBP80, comprises three domains, each containing consecutive helical hairpins and resembling the so-called MIF4G domain found in several other proteins involved in RNA metabolism ...

    The heterodimeric nuclear cap binding complex (CBC) binds to 5'-capped polymerase II transcripts. It enhances the efficiency of several mRNA maturation steps and is essential for U snRNA nuclear export in multicellular eukaryotes. The 2A crystal structure of human CBC shows that the large subunit, CBP80, comprises three domains, each containing consecutive helical hairpins and resembling the so-called MIF4G domain found in several other proteins involved in RNA metabolism. The small subunit, CPB20, has an RNP fold and associates with the second and third domains of CBP80. Site-directed mutagenesis revealed 4 residues of CBP20 which are critical for cap binding. A model for cap binding is proposed based on these results and the known mode of binding of RNA to RNP domains.

    Organizational Affiliation: 

    European Molecular Biology Laboratory, Grenoble Outstation, 6 rue Jules Horowitz, BP181, F-38042 9, Grenoble Cedex, France.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CBP80A, B, C757Homo sapiensMutation(s): 1 
Gene Names: NCBP1, CBP80, NCBP
UniProt & NIH Common Fund Data Resources
Find proteins for Q09161 (Homo sapiens)
Explore Q09161 
Go to UniProtKB:  Q09161
PHAROS:  Q09161
Entity Groups  
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UniProt GroupQ09161
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
20 KDA NUCLEAR CAP BINDING PROTEIND [auth X],
E [auth Y],
F [auth Z]		98Homo sapiensMutation(s): 0 
Gene Names: NCBP2, CBP20, PIG55
UniProt & NIH Common Fund Data Resources
Find proteins for P52298 (Homo sapiens)
Explore P52298 
Go to UniProtKB:  P52298
PHAROS:  P52298
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP52298
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.203 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 75.527α = 90
b = 161.48β = 90
c = 303.291γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
SHELXDphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-09-13
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-08-23
    Changes: Data collection
  • Version 1.4: 2019-04-03
    Changes: Data collection, Source and taxonomy