6MZG

Structural Basis of Tubulin Recruitment and Assembly by Microtubule Polymerases with Tumor Overexpressed Gene (TOG) Domain Arrays


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.21 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.180 

wwPDB Validation   3D Report Full Report


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Literature

Structural basis of tubulin recruitment and assembly by microtubule polymerases with Tumor Overexpressed Gene (TOG) domain arrays.

Nithianantham, S.Cook, B.D.Beans, M.Guo, F.Chang, F.Al-Bassam, J.

(2018) Elife 7

  • DOI: 10.7554/eLife.38922
  • Primary Citation of Related Structures:  
    6MZF, 6MZE, 6MZG

  • PubMed Abstract: 
  • XMAP215/Stu2/Alp14 proteins accelerate microtubule plus-end polymerization by recruiting tubulins via arrays of tumor overexpressed gene (TOG) domains, yet their mechanism remains unknown. Here, we describe the biochemical and structural basis for TOG arrays in recruiting and polymerizing tubulins ...

    XMAP215/Stu2/Alp14 proteins accelerate microtubule plus-end polymerization by recruiting tubulins via arrays of tumor overexpressed gene (TOG) domains, yet their mechanism remains unknown. Here, we describe the biochemical and structural basis for TOG arrays in recruiting and polymerizing tubulins. Alp14 binds four tubulins via dimeric TOG1-TOG2 subunits, in which each domain exhibits a distinct exchange rate for tubulin. X-ray structures revealed square-shaped assemblies composed of pseudo-dimeric TOG1-TOG2 subunits assembled head-to-tail, positioning four unpolymerized tubulins in a polarized wheel-like configuration. Crosslinking and electron microscopy show Alp14-tubulin forms square assemblies in solution, and inactivating their interfaces destabilize this organization without influencing tubulin binding. An X-ray structure determined using approach to modulate tubulin polymerization revealed an unfurled assembly, in which TOG1-TOG2 uniquely bind to two polymerized tubulins. Our findings suggest a new microtubule polymerase model in which TOG arrays recruit tubulins by forming square assemblies that then unfurl, facilitating their concerted polymerization into protofilaments.


    Organizational Affiliation

    Molecular Cellular Biology Department, University of California, Davis, United States.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Tubulin alpha-1A chain ACGI451Sus scrofaMutation(s): 0 
Gene Names: TUBA1A
Find proteins for P02550 (Sus scrofa)
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Go to UniProtKB:  P02550
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Tubulin beta chain BDHJ445Sus scrofaMutation(s): 0 
Find proteins for P02554 (Sus scrofa)
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Go to UniProtKB:  P02554
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Protein Stu2p/Alp14p EK554Lachancea kluyveri NRRL Y-12651Mutation(s): 0 
Gene Names: SKLU-Cont10078
Find proteins for A0A493R6X8 (Lachancea kluyveri (strain ATCC 58438 / CBS 3082 / BCRC 21498 / NBRC 1685 / JCM 7257 / NCYC 543 / NRRL Y-12651))
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Go to UniProtKB:  A0A493R6X8
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Truncated Darpin-D1 FL140Escherichia coliMutation(s): 0 
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.21 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.180 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 115.13α = 90
b = 194.99β = 90.19
c = 149.57γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
PHASERphasing
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 StatesGM110283

Revision History  (Full details and data files)

  • Version 1.0: 2018-11-28
    Type: Initial release
  • Version 1.1: 2020-01-01
    Changes: Author supporting evidence