5VJC

TOG-tubulin binding specificity promotes microtubule dynamics and mitotic spindle formation

  • Classification: CELL CYCLE
  • Organism(s): Drosophila melanogaster
  • Expression System: Escherichia coli
  • Mutation(s): No 

  • Deposited: 2017-04-19 Released: 2017-05-10 
  • Deposition Author(s): Byrnes, A.E., Slep, K.C.
  • Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS), March of Dimes, American Heart Association

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.189 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.5 of the entry. See complete history


Literature

TOG-tubulin binding specificity promotes microtubule dynamics and mitotic spindle formation.

Byrnes, A.E.Slep, K.C.

(2017) J Cell Biol 216: 1641-1657

  • DOI: https://doi.org/10.1083/jcb.201610090
  • Primary Citation of Related Structures:  
    5VJC

  • PubMed Abstract: 

    XMAP215, CLASP, and Crescerin use arrayed tubulin-binding tumor overexpressed gene (TOG) domains to modulate microtubule dynamics. We hypothesized that TOGs have distinct architectures and tubulin-binding properties that underlie each family's ability to promote microtubule polymerization or pause. As a model, we investigated the pentameric TOG array of a Drosophila melanogaster XMAP215 member, Msps. We found that Msps TOGs have distinct architectures that bind either free or polymerized tubulin, and that a polarized array drives microtubule polymerization. An engineered TOG1-2-5 array fully supported Msps-dependent microtubule polymerase activity. Requisite for this activity was a TOG5-specific N-terminal HEAT repeat that engaged microtubule lattice-incorporated tubulin. TOG5-microtubule binding maintained mitotic spindle formation as deleting or mutating TOG5 compromised spindle architecture and increased the mitotic index. Mad2 knockdown released the spindle assembly checkpoint triggered when TOG5-microtubule binding was compromised, indicating that TOG5 is essential for spindle function. Our results reveal a TOG5-specific role in mitotic fidelity and support our hypothesis that architecturally distinct TOGs arranged in a sequence-specific order underlie TOG array microtubule regulator activity.


  • Organizational Affiliation

    Department of Biochemistry and Biophysics, University of North Carolina, Chapel Hill, NC 27599.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Protein mini spindles
A, B
271Drosophila melanogasterMutation(s): 0 
Gene Names: mspsCG5000
UniProt
Find proteins for Q9VEZ3 (Drosophila melanogaster)
Explore Q9VEZ3 
Go to UniProtKB:  Q9VEZ3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9VEZ3
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.189 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 53.256α = 90
b = 80.035β = 90
c = 146.771γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
PHENIXphasing
Cootmodel building

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesT32GM008570
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01GM094415
March of DimesUnited StatesFY11-434
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesF31-GM115107
American Heart AssociationUnited States15PRE25380004

Revision History  (Full details and data files)

  • Version 1.0: 2017-05-10
    Type: Initial release
  • Version 1.1: 2017-05-31
    Changes: Data collection, Database references
  • Version 1.2: 2017-06-21
    Changes: Database references, Refinement description
  • Version 1.3: 2017-09-27
    Changes: Author supporting evidence
  • Version 1.4: 2020-01-01
    Changes: Author supporting evidence
  • Version 1.5: 2023-10-04
    Changes: Data collection, Database references, Refinement description