Biological Assembly 1  

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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)

Macromolecule Content

• Total Structure Weight: 52016.16 
• Atom Count: 3400 
• Residue Count: 480 
• Unique protein chains: 2

1PJM

Mouse Importin alpha-bipartite NLS from human retinoblastoma protein Complex

• DOI: 10.2210/pdb1PJM/pdb

• Classification: PROTEIN TRANSPORT
• Organism(s): Homo sapiens, Mus musculus
• Expression System: Escherichia coli
• Mutation(s): 3 


• Deposited: 2003-06-03 Released: 2003-08-19 
• Deposition Author(s): Fontes, M.R.M., Teh, T., Jans, D., Brinkworth, R.I., Kobe, B.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.5 Å
• R-Value Free: 0.239 
• R-Value Work: 0.204 

Literature

Structural basis for the specificity of bipartite nuclear localization sequence binding by importin-alpha

Fontes, M.R.M., Teh, T., Jans, D., Brinkworth, R.I., Kobe, B.

(2003) J.Biol.Chem. 278: 27981-27987

• PubMed: 12695505 
• DOI: 10.1074/jbc.M303275200
• Primary Citation of Related Structures:  
  1PJN


• PubMed Abstract: 
  

Importin-alpha is the nuclear import receptor that recognizes cargo proteins carrying conventional basic monopartite and bipartite nuclear localization sequences (NLSs) and facilitates their transport into the nucleus. Bipartite NLSs contain two clusters of basic residues, connected by linkers of variable lengths. To determine the structural basis of the recognition of diverse bipartite NLSs by mammalian importin-alpha, we co-crystallized a non-autoinhibited mouse receptor protein with peptides corresponding to the NLSs from human retinoblastoma protein and Xenopus laevis phosphoprotein N1N2, containing diverse sequences and lengths of the linker. We show that the basic clusters interact analogously in both NLSs, but the linker sequences adopt different conformations, whereas both make specific contacts with the receptor. The available data allow us to draw general conclusions about the specificity of NLS binding by importin-alpha and facilitate an improved definition of the consensus sequence of a conventional basic/bipartite NLS (KRX10-12KRRK) that can be used to identify novel nuclear proteins.

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Related Citations: 

• Autoinhibition by an internal nuclear localization signal reveled by the crystal structure of mammalian importin alpha
  Kobe, B.
  (1999) Nat.Struct.Mol.Biol. 6: 388
• Biophysical Characterization of Interactions Involving Impostin-alpha during Nuclear Import
  Catimel, B.,Teh, T.,Fontes, M.R.M.,Jennings, I.G.,Jans, D.,Howlett, G.J.,Nice, E.C.,Kobe, B.
  (2001) J.Biol.Chem. 276: 34189
• Structural basis of recognition of monopartite and bipartite nuclear localization sequences by mammalian importin-alpha
  Fontes, M.R.M.,Teh, T.,Kobe, B.
  (2000) J.Mol.Biol. 297: 1183




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Organizational Affiliation: 

Structural Biology Laboratory, St. Vincent's Institute of Medical Research, 41 Victoria Parade, Fitzroy, Victoria 3065, Australia.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Retinoblastoma-associated protein	A	20	Homo sapiens	Mutation(s): 3  Gene Names: RB1
Find proteins for P06400 (Homo sapiens) Go to Gene View: RB1 Go to UniProtKB:  P06400

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
Importin alpha-2 subunit	B	460	Mus musculus	Mutation(s): 0  Gene Names: Kpna2 (Rch1)
Find proteins for P52293 (Mus musculus) Go to UniProtKB:  P52293

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.5 Å
• R-Value Free: 0.239 
• R-Value Work: 0.204 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length (Å)	Angle (°)
a = 79.000	α = 90.00
b = 89.179	β = 90.00
c = 100.992	γ = 90.00

Software Package:

Software Name	Purpose
CNS	refinement
DENZO	data reduction
CNS	phasing
SCALEPACK	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2003-06-03 
• Released Date: 2003-08-19 
• Deposition Author(s): Fontes, M.R.M., Teh, T., Jans, D., Brinkworth, R.I., Kobe, B.

Revision History 

• Version 1.0: 2003-08-19
  Type: Initial release
• Version 1.1: 2008-04-29
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance