4C0P

Unliganded Transportin 3


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.95 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.236 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural Basis for Nuclear Import of Splicing Factors by Human Transportin 3.

Maertens, G.N.Cook, N.J.Wang, W.Hare, S.Gupta, S.S.Oztop, I.Lee, K.Pye, V.E.Cosnefroy, O.Snijders, A.P.Kewalramani, V.N.Fassati, A.Engelman, A.Cherepanov, P.

(2014) Proc.Natl.Acad.Sci.USA 111: 2728

  • DOI: 10.1073/pnas.1320755111
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Transportin 3 (Tnpo3, Transportin-SR2) is implicated in nuclear import of splicing factors and HIV-1 replication. Herein, we show that the majority of cellular Tnpo3 binding partners contain arginine-serine (RS) repeat domains and present crystal str ...

    Transportin 3 (Tnpo3, Transportin-SR2) is implicated in nuclear import of splicing factors and HIV-1 replication. Herein, we show that the majority of cellular Tnpo3 binding partners contain arginine-serine (RS) repeat domains and present crystal structures of human Tnpo3 in its free as well as GTPase Ran- and alternative splicing factor/splicing factor 2 (ASF/SF2)-bound forms. The flexible β-karyopherin fold of Tnpo3 embraces the RNA recognition motif and RS domains of the cargo. A constellation of charged residues on and around the arginine-rich helix of Tnpo3 HEAT repeat 15 engage the phosphorylated RS domain and are critical for the recognition and nuclear import of ASF/SF2. Mutations in the same region of Tnpo3 impair its interaction with the cleavage and polyadenylation specificity factor 6 (CPSF6) and its ability to support HIV-1 replication. Steric incompatibility of the RS domain and RanGTP engagement by Tnpo3 provides the mechanism for cargo release in the nucleus. Our results elucidate the structural bases for nuclear import of splicing factors and the Tnpo3-CPSF6 nexus in HIV-1 biology.


    Organizational Affiliation

    Division of Infectious Diseases, Imperial College London, St. Mary's Campus, London W2 1PG, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TRANSPORTIN-3
A, B, C, D
923Homo sapiensMutation(s): 1 
Gene Names: TNPO3 (IPO12)
Find proteins for Q9Y5L0 (Homo sapiens)
Go to Gene View: TNPO3
Go to UniProtKB:  Q9Y5L0
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
DTT
Query on DTT

Download SDF File 
Download CCD File 
A, B, C, D
2,3-DIHYDROXY-1,4-DITHIOBUTANE
1,4-DITHIOTHREITOL
C4 H10 O2 S2
VHJLVAABSRFDPM-IMJSIDKUSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.95 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.236 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 96.198α = 90.64
b = 104.019β = 97.88
c = 124.890γ = 104.48
Software Package:
Software NamePurpose
SCALAdata scaling
PHENIXrefinement
XDSdata reduction
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-01-22
    Type: Initial release
  • Version 1.1: 2014-01-29
    Type: Database references, Structure summary
  • Version 1.2: 2014-02-05
    Type: Database references
  • Version 1.3: 2014-03-05
    Type: Database references