Biological Assembly 1  

 3D View: Structure | 1D-3D View | Validation Report | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 93.55 kDa 
• Atom Count: 6782 
• Modelled Residue Count: 844 
• Deposited Residue Count: 844 
• Unique protein chains: 1

1BK5

KARYOPHERIN ALPHA FROM SACCHAROMYCES CEREVISIAE

• PDB DOI: 10.2210/pdb1BK5/pdb

• Classification: PROTEIN TRANSPORT
• Organism(s): Saccharomyces cerevisiae
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 1998-07-14 Released: 1999-01-06 
• Deposition Author(s): Conti, E., Uy, M., Leighton, L., Blobel, G., Kuriyan, J.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.276 
• R-Value Work: 0.237 
• R-Value Observed: 0.237 

Literature

Crystallographic analysis of the recognition of a nuclear localization signal by the nuclear import factor karyopherin alpha.

Conti, E., Uy, M., Leighton, L., Blobel, G., Kuriyan, J.

(1998) Cell 94: 193-204

• PubMed: 9695948 
• DOI: 10.1016/s0092-8674(00)81419-1
• Primary Citation of Related Structures:  
  1BK5, 1BK6


• PubMed Abstract: 
  

Selective nuclear import is mediated by nuclear localization signals (NLSs) and cognate transport factors known as karyopherins or importins. Karyopherin alpha recognizes "classical" monopartite and bipartite NLSs. We report the crystal structure of a 50 kDa fragment of the 60 kDa yeast karyopherin alpha, in the absence and presence of a monopartite NLS peptide at 2.2 A and 2.8 A resolution, respectively. The structure shows a tandem array of ten armadillo repeats, organized in a right-handed superhelix of helices. Binding of the NLS peptide occurs at two sites within a helical surface groove that is lined by conserved residues. The structure reveals the determinants of NLS specificity and suggests a model for the recognition of bipartite NLSs.

---

Organizational Affiliation: 

Laboratories of Molecular Biophysics, The Rockefeller University, New York, New York 10021, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
KARYOPHERIN ALPHA	A, B	422	Saccharomyces cerevisiae	Mutation(s): 0  Gene Names: SRP1
UniProt
Find proteins for Q02821 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c)) Explore Q02821  Go to UniProtKB:  Q02821

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CO	C [auth A], D [auth B]	COBALT (II) ION Co XLJKHNWPARRRJB-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.276 
• R-Value Work: 0.237 
• R-Value Observed: 0.237 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 157.98	α = 90
b = 74.14	β = 90
c = 84.05	γ = 90

Software Package:

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

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1998-07-14 
• Released Date: 1999-01-06 
Deposition Author(s): Conti, E., Uy, M., Leighton, L., Blobel, G., Kuriyan, J.

Revision History  

• Version 1.0: 1999-01-06
  Type: Initial release
  
• Version 1.1: 2008-03-03
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance