1H6K

nuclear Cap Binding Complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.234 
  • R-Value Work: 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


  • 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 stru ...

    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

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CBP80
A, B, C
757Homo sapiensMutation(s): 1 
Gene Names: NCBP1 (CBP80, NCBP)
Find proteins for Q09161 (Homo sapiens)
Go to Gene View: NCBP1
Go to UniProtKB:  Q09161
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
20 KDA NUCLEAR CAP BINDING PROTEIN
X, Y, Z
98Homo sapiensMutation(s): 0 
Gene Names: NCBP2 (CBP20)
Find proteins for P52298 (Homo sapiens)
Go to Gene View: NCBP2
Go to UniProtKB:  P52298
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.203 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 75.527α = 90.00
b = 161.480β = 90.00
c = 303.291γ = 90.00
Software Package:
Software NamePurpose
SHELXDphasing
DENZOdata reduction
SCALEPACKdata scaling
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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