3ICQ

Karyopherin nuclear state

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.294 
  • R-Value Work: 0.243 

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Literature

Structures of the tRNA export factor in the nuclear and cytosolic states

Cook, A.G., Fukuhara, N., Jinek, M., Conti, E.

(2009) Nature 461: 60-65

  • DOI: 10.1038/nature08394
  • Primary Citation of Related Structures:  
    3IBV, 3ICQ

  • PubMed Abstract: 

    • Transfer RNAs are among the most ubiquitous molecules in cells, central to decoding information from messenger RNAs on translating ribosomes. In eukaryotic cells, tRNAs are actively transported from their site of synthesis in the nucleus to their site of function in the cytosol ...

    Transfer RNAs are among the most ubiquitous molecules in cells, central to decoding information from messenger RNAs on translating ribosomes. In eukaryotic cells, tRNAs are actively transported from their site of synthesis in the nucleus to their site of function in the cytosol. This is mediated by a dedicated nucleo-cytoplasmic transport factor of the karyopherin-beta family (Xpot, also known as Los1 in Saccharomyces cerevisiae). Here we report the 3.2 A resolution structure of Schizosaccharomyces pombe Xpot in complex with tRNA and RanGTP, and the 3.1 A structure of unbound Xpot, revealing both nuclear and cytosolic snapshots of this transport factor. Xpot undergoes a large conformational change on binding cargo, wrapping around the tRNA and, in particular, binding to the tRNA 5' and 3' ends. The binding mode explains how Xpot can recognize all mature tRNAs in the cell and yet distinguish them from those that have not been properly processed, thus coupling tRNA export to quality control.

    Organizational Affiliation: 

    Structural Cell Biology, MPI for Biochemistry, Am Klopferspitz 18, 82152 Martinsried, Germany.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Exportin-TA [auth T],
D [auth U]		980Schizosaccharomyces pombeMutation(s): 0 
Gene Names: los1, SPBP8B7.09c
UniProt
Find proteins for O94258 (Schizosaccharomyces pombe (strain 972 / ATCC 24843))
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Go to UniProtKB:  O94258
Entity Groups  
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UniProt GroupO94258
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
GTP-binding nuclear protein GSP1/CNR1B,
E [auth C]		171Saccharomyces cerevisiaeMutation(s): 1 
Gene Names: CNR1, CST17, GSP1, L8003.19, YLR293C
UniProt
Find proteins for P32835 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P32835 
Go to UniProtKB:  P32835
Entity Groups  
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UniProt GroupP32835
Protein Feature View
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Entity ID: 3
MoleculeChainsLengthOrganismImage
RNA (62-MER)C [auth D],
F [auth E]		67N/A
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GTP
Query on GTP
Download Ideal Coordinates CCD File 
G [auth B],
I [auth C]		GUANOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O14 P3
XKMLYUALXHKNFT-UUOKFMHZSA-N		 Ligand Interaction
MG
Query on MG
Download Ideal Coordinates CCD File 
H [auth B],
J [auth C]		MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.294 
  • R-Value Work: 0.243 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 143α = 90
b = 143.8β = 90
c = 166.9γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing
CNSrefinement
PDB_EXTRACTdata extraction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-08-25
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2021-11-10
    Changes: Database references, Derived calculations