5TQC

Crystal structure of transport factor karyopherin-beta 2 in complex with the PY-NLS of ribosomal protein L4 (RpL4)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.208 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Molecular basis for protection of ribosomal protein L4 from cellular degradation.

Huber, F.M.Hoelz, A.

(2017) Nat Commun 8: 14354-14354

  • DOI: 10.1038/ncomms14354
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Eukaryotic ribosome biogenesis requires the nuclear import of ∼80 nascent ribosomal proteins and the elimination of excess amounts by the cellular degradation machinery. Assembly chaperones recognize nascent unassembled ribosomal proteins and transpo ...

    Eukaryotic ribosome biogenesis requires the nuclear import of ∼80 nascent ribosomal proteins and the elimination of excess amounts by the cellular degradation machinery. Assembly chaperones recognize nascent unassembled ribosomal proteins and transport them together with karyopherins to their nuclear destination. We report the crystal structure of ribosomal protein L4 (RpL4) bound to its dedicated assembly chaperone of L4 (Acl4), revealing extensive interactions sequestering 70 exposed residues of the extended RpL4 loop. The observed molecular recognition fundamentally differs from canonical promiscuous chaperone-substrate interactions. We demonstrate that the eukaryote-specific RpL4 extension harbours overlapping binding sites for Acl4 and the nuclear transport factor Kap104, facilitating its continuous protection from the cellular degradation machinery. Thus, Acl4 serves a dual function to facilitate nuclear import and simultaneously protect unassembled RpL4 from the cellular degradation machinery.


    Organizational Affiliation

    Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, Pasadena, California 91125, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Transportin-1,Transportin-1
A
866Homo sapiensMutation(s): 0 
Gene Names: TNPO1 (KPNB2, MIP1, TRN)
Find proteins for Q92973 (Homo sapiens)
Go to Gene View: TNPO1
Go to UniProtKB:  Q92973
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
60S ribosomal protein L4-like protein
B
26Chaetomium thermophilum (strain DSM 1495 / CBS 144.50 / IMI 039719)Mutation(s): 0 
Find proteins for G0SFC3 (Chaetomium thermophilum (strain DSM 1495 / CBS 144.50 / IMI 039719))
Go to UniProtKB:  G0SFC3
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.208 
  • Space Group: P 2 21 21
Unit Cell:
Length (Å)Angle (°)
a = 68.630α = 90.00
b = 130.700β = 90.00
c = 174.200γ = 90.00
Software Package:
Software NamePurpose
XDSdata scaling
PHENIXrefinement
XDSdata reduction
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2016-10-23 
  • Released Date: 2017-02-15 
  • Deposition Author(s): Huber, F.M., Hoelz, A.

Funding OrganizationLocationGrant Number
Heritage Medical Research InstituteUnited States--
Howard Hughes Medical InstituteUnited States--

Revision History 

  • Version 1.0: 2017-02-15
    Type: Initial release
  • Version 1.1: 2017-09-20
    Type: Author supporting evidence