Biological Assembly 1  

 3D View: Structure

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Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - AB 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly 2  

 3D View: Structure

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Protein Workshop | Ligand Explorer

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - AB 

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 104144.48 
• Atom Count: 7158 
• Residue Count: 940 
• Unique protein chains: 2

1F59

IMPORTIN-BETA-FXFG NUCLEOPORIN COMPLEX

• DOI: 10.2210/pdb1F59/pdb

• Classification: TRANSPORT PROTEIN RECEPTOR
• Organism(s): Homo sapiens
• Expression System: Escherichia coli


• Deposited: 2000-06-13 Released: 2000-08-16 
• Deposition Author(s): Bayliss, R., Littlewood, T., Stewart, M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.8 Å
• R-Value Free: 0.262 
• R-Value Work: 0.225 

Literature

Structural basis for the interaction between FxFG nucleoporin repeats and importin-beta in nuclear trafficking.

Bayliss, R., Littlewood, T., Stewart, M.

(2000) Cell 102: 99-108

• PubMed: 10929717 


• PubMed Abstract: 
  

We describe the crystal structure of a complex between importin-beta residues 1-442 (Ib442) and five FxFG nucleoporin repeats from Nsp1p. Nucleoporin FxFG cores bind on the convex face of Ib442 to a primary site between the A helices of HEAT repeats 5 and 6, and to a secondary site between HEAT repeats 6 and 7. Mutations at importin-beta Ile178 in the primary FxFG binding site reduce both binding and nuclear protein import, providing direct evidence for the functional significance of the importin-beta-FxFG interaction. The FxFG binding sites on importin-beta do not overlap with the RanGTP binding site. Instead, RanGTP may release importin-beta from FxFG nucleoporins by generating a conformational change that alters the structure of the FxFG binding site.

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Organizational Affiliation: 

MRC Laboratory of Molecular Biology, Cambridge, United Kingdom.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
IMPORTIN BETA-1	A, B	442	Homo sapiens	Mutation(s): 0  Gene Names: KPNB1 (NTF97)
Find proteins for Q14974 (Homo sapiens) Go to Gene View: KPNB1 Go to UniProtKB:  Q14974

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
FXFG NUCLEOPORIN REPEATS	C, D	28	N/A	Mutation(s): 0
Protein Feature View is not available: No corresponding UniProt sequence found.

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
UNK	C, D	L-PEPTIDE LINKING	C4 H9 N O2		--

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.8 Å
• R-Value Free: 0.262 
• R-Value Work: 0.225 
• Space Group: P 2₁ 2₁ 2

Unit Cell:

Length (Å)	Angle (°)
a = 67.246	α = 90.00
b = 211.790	β = 90.00
c = 125.815	γ = 90.00

Software Package:

Software Name	Purpose
CNS	phasing
MOSFLM	data reduction
CNS	refinement
CCP4	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2000-06-13 
• Released Date: 2000-08-16 
• Deposition Author(s): Bayliss, R., Littlewood, T., Stewart, M.

Revision History 

• Version 1.0: 2000-08-16
  Type: Initial release
• Version 1.1: 2008-04-27
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance
• Version 1.3: 2018-01-31
  Type: Experimental preparation