RCSB PDB - 1QBK: STRUCTURE OF THE KARYOPHERIN BETA2-RAN GPPNHP NUCLEAR TRANSPORT COMPLEX (original) (raw)
STRUCTURE OF THE KARYOPHERIN BETA2-RAN GPPNHP NUCLEAR TRANSPORT COMPLEX
This is version 1.5 of the entry. See complete history.
Structure of the nuclear transport complex karyopherin-beta2-Ran x GppNHp.
[Chook, Y.M.](/search?q=citation.rcsb%5Fauthors:Chook, Y.M.), [Blobel, G.](/search?q=citation.rcsb%5Fauthors:Blobel, G.)
(1999) Nature 399: 230-237
PubMed: 10353245 Search on PubMed
PubMed Abstract:
Transport factors in the karyopherin-beta (also called importin-beta) family mediate the movement of macromolecules in nuclear-cytoplasmic transport pathways. Karyopherin-beta2 (transportin) binds a cognate import substrate and targets it to the nuclear pore complex. In the nucleus, Ran x GTP binds karyopherin-beta2 and dissociates the substrate. Here we present the 3.0 A structure of the karyopherin-beta2-Ran x GppNHp complex where GppNHp is a non-hydrolysable GTP analogue. Karyopherin-beta2 contains eighteen HEAT repeats arranged into two continuous orthogonal arches. Ran is clamped in the amino-terminal arch and substrate-binding activity is mapped to the carboxy-terminal arch. A large loop in HEAT repeat 7 spans both arches. Interactions of the loop with Ran and the C-terminal arch implicate it in GTPase-mediated dissociation of the import-substrate. Ran x GppNHp in the complex shows extensive structural rearrangement, compared to Ran GDP, in regions contacting karyopherin-beta2. This provides a structural basis for the specificity of the karyopherin-beta family for the GTP-bound state of Ran, as well as a rationale for interactions of the karyopherin-Ran complex with the regulatory proteins ranGAP, ranGEF and ranBP1.
Organizational Affiliation:
Laboratory of Cell Biology, Howard Hughes Medical Institute, The Rockefeller University, New York, New York 10021, USA.
Macromolecule Content
- Total Structure Weight: 127.67 kDa
- Atom Count: 8,572
- Modelled Residue Count: 1,070
- Deposited Residue Count: 1,106
- Unique protein chains: 2
Find similar proteins by:
(by identity cutoff) | 3D Structure
Find similar proteins by:
(by identity cutoff) | 3D Structure
| Modified Residues 1 Unique | |||||
|---|---|---|---|---|---|
| ID | Chains | Type | Formula | 2D Diagram | Parent |
| MSEQuery on MSE | A [auth B] | L-PEPTIDE LINKING | C5 H11 N O2 Se |  |
MET |
Experimental Data & Validation
Experimental Data
- Space Group: [P 32 2 1](/search?q=symmetry.space%5Fgroup%5Fname%5FH%5FM:P 32 2 1)
Unit Cell:
| Length ( Å ) | Angle ( ˚ ) |
|---|---|
| a = 133.11 | α = 90 |
| b = 133.11 | β = 90 |
| c = 138.41 | γ = 120 |
Software Package:
| Software Name | Purpose |
|---|---|
| MLPHARE | phasing |
| CNS | refinement |
| DENZO | data reduction |
| SCALEPACK | data scaling |
Revision History (Full details and data files)
- Version 1.0: 1999-06-01
Type: Initial release - Version 1.1: 2008-04-27
Changes: Version format compliance - Version 1.2: 2011-07-13
Changes: Version format compliance - Version 1.3: 2018-01-31
Changes: Experimental preparation - Version 1.4: 2024-03-13
Changes: Data collection, Database references, Derived calculations, Source and taxonomy, Structure summary - Version 1.5: 2024-10-30
Changes: Structure summary