6BJC

TPX2_mini decorated GMPCPP-microtubule

  • Classification: CELL CYCLE
  • Organism(s): Sus scrofa, Homo sapiens
  • Expression System: Spodoptera aff. frugiperda 2 RZ-2014
  • Mutation(s): No 

  • Deposited: 2017-11-05 Released: 2017-11-22 
  • Deposition Author(s): Zhang, R., Nogales, E.
  • Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS), Howard Hughes Medical Institute (HHMI), Cancer Research UK, Medical Research Council (MRC, United Kingdom), Wellcome Trust

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 Å
  • Aggregation State: HELICAL ARRAY 
  • Reconstruction Method: HELICAL 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structural insight into TPX2-stimulated microtubule assembly.

Zhang, R.Roostalu, J.Surrey, T.Nogales, E.

(2017) Elife 6

  • DOI: 10.7554/eLife.30959
  • Primary Citation of Related Structures:  
    6BJC

  • PubMed Abstract: 
  • During mitosis and meiosis, microtubule (MT) assembly is locally upregulated by the chromatin-dependent Ran-GTP pathway. One of its key targets is the MT-associated spindle assembly factor TPX2. The molecular mechanism of how TPX2 stimulates MT assembly ...

    During mitosis and meiosis, microtubule (MT) assembly is locally upregulated by the chromatin-dependent Ran-GTP pathway. One of its key targets is the MT-associated spindle assembly factor TPX2. The molecular mechanism of how TPX2 stimulates MT assembly remains unknown because structural information about the interaction of TPX2 with MTs is lacking. Here, we determine the cryo-electron microscopy structure of a central region of TPX2 bound to the MT surface. TPX2 uses two flexibly linked elements ('ridge' and 'wedge') in a novel interaction mode to simultaneously bind across longitudinal and lateral tubulin interfaces. These MT-interacting elements overlap with the binding site of importins on TPX2. Fluorescence microscopy-based in vitro reconstitution assays reveal that this interaction mode is critical for MT binding and facilitates MT nucleation. Together, our results suggest a molecular mechanism of how the Ran-GTP gradient can regulate TPX2-dependent MT formation.


    Organizational Affiliation

    Howard Hughes Medical Institute, University of California, Berkeley, Berkeley, United States.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Tubulin alpha-1B chain ACEJKL451Sus scrofaMutation(s): 0 
Gene Names: TUBA1B
Find proteins for Q2XVP4 (Sus scrofa)
Explore Q2XVP4 
Go to UniProtKB:  Q2XVP4
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Tubulin beta chain BDFGHI445Sus scrofaMutation(s): 0 
Find proteins for P02554 (Sus scrofa)
Explore P02554 
Go to UniProtKB:  P02554
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Targeting protein for Xklp2 PT747Homo sapiensMutation(s): 0 
Gene Names: TPX2C20orf1C20orf2DIL2HCA519
Find proteins for Q9ULW0 (Homo sapiens)
Explore Q9ULW0 
Go to UniProtKB:  Q9ULW0
NIH Common Fund Data Resources
PHAROS:  Q9ULW0
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GTP
Query on GTP

Download Ideal Coordinates CCD File 
A, C, E, J, K, L
GUANOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O14 P3
XKMLYUALXHKNFT-UUOKFMHZSA-N
 Ligand Interaction
G2P
Query on G2P

Download Ideal Coordinates CCD File 
B, D, F, G, H, I
PHOSPHOMETHYLPHOSPHONIC ACID GUANYLATE ESTER
C11 H18 N5 O13 P3
GXTIEXDFEKYVGY-KQYNXXCUSA-N
 Ligand Interaction
MG
Query on MG

Download Ideal Coordinates CCD File 
A, B, C, D, E, F, G, H, I, J, K, L
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 Å
  • Aggregation State: HELICAL ARRAY 
  • Reconstruction Method: HELICAL 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2017-11-05 
  • Released Date: 2017-11-22 
  • Deposition Author(s): Zhang, R., Nogales, E.

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM051487
Howard Hughes Medical Institute (HHMI)United States--
Cancer Research UKUnited KingdomFC001163
Medical Research Council (MRC, United Kingdom)United KingdomFC001163
Wellcome TrustUnited KingdomFC001163

Revision History 

  • Version 1.0: 2017-11-22
    Type: Initial release
  • Version 1.1: 2018-10-03
    Changes: Data collection, Other, Refinement description
  • Version 1.2: 2019-11-20
    Changes: Author supporting evidence
  • Version 1.3: 2019-12-18
    Changes: Author supporting evidence, Other