4QMJ

The XMAP215 family drives microtubule polymerization using a structurally diverse TOG array


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.215 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

The XMAP215 family drives microtubule polymerization using a structurally diverse TOG array.

Fox, J.C.Howard, A.E.Currie, J.D.Rogers, S.L.Slep, K.C.

(2014) Mol Biol Cell 25: 2375-2392

  • DOI: 10.1091/mbc.E13-08-0501
  • Primary Citation of Related Structures:  
    4QMH, 4QMI, 4QMJ

  • PubMed Abstract: 
  • XMAP215 family members are potent microtubule (MT) polymerases, with mutants displaying reduced MT growth rates and aberrant spindle morphologies. XMAP215 proteins contain arrayed tumor overexpressed gene (TOG) domains that bind tubulin. Whether these TOG domains are architecturally equivalent is unknown ...

    XMAP215 family members are potent microtubule (MT) polymerases, with mutants displaying reduced MT growth rates and aberrant spindle morphologies. XMAP215 proteins contain arrayed tumor overexpressed gene (TOG) domains that bind tubulin. Whether these TOG domains are architecturally equivalent is unknown. Here we present crystal structures of TOG4 from Drosophila Msps and human ch-TOG. These TOG4 structures architecturally depart from the structures of TOG domains 1 and 2, revealing a conserved domain bend that predicts a novel engagement with α-tubulin. In vitro assays show differential tubulin-binding affinities across the TOG array, as well as differential effects on MT polymerization. We used Drosophila S2 cells depleted of endogenous Msps to assess the importance of individual TOG domains. Whereas a TOG1-4 array largely rescues MT polymerization rates, mutating tubulin-binding determinants in any single TOG domain dramatically reduces rescue activity. Our work highlights the structurally diverse yet positionally conserved TOG array that drives MT polymerization.


    Organizational Affiliation

    Department of Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599 kslep@bio.unc.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Cytoskeleton-associated protein 5A240Homo sapiensMutation(s): 0 
Gene Names: chTOGCKAP5KIAA0097
UniProt & NIH Common Fund Data Resources
Find proteins for Q14008 (Homo sapiens)
Explore Q14008 
Go to UniProtKB:  Q14008
PHAROS:  Q14008
GTEx:  ENSG00000175216 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ14008
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.215 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 79.125α = 90
b = 79.125β = 90
c = 68.499γ = 90
Software Package:
Software NamePurpose
SERGUIdata collection
PHENIXmodel building
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHENIXphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-07-09
    Type: Initial release
  • Version 1.1: 2014-09-03
    Changes: Database references