4FFB

A TOG:alpha/beta-tubulin Complex Structure Reveals Conformation-Based Mechanisms For a Microtubule Polymerase

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.88 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.207 
  • R-Value Observed: 0.210 

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Literature

A TOG: alpha beta-tubulin complex structure reveals conformation-based mechanisms for a microtubule polymerase.

Ayaz, P., Ye, X., Huddleston, P., Brautigam, C.A., Rice, L.M.

(2012) Science 337: 857-860

  • DOI: 10.1126/science.1221698
  • Primary Citation of Related Structures:  
    4FFB

  • PubMed Abstract: 

    • Stu2p/XMAP215/Dis1 family proteins are evolutionarily conserved regulatory factors that use αβ-tubulin-interacting tumor overexpressed gene (TOG) domains to catalyze fast microtubule growth. Catalysis requires that these polymerases discriminate between unpolymerized and polymerized forms of αβ-tubulin, but the mechanism by which they do so has remained unclear ...

    Stu2p/XMAP215/Dis1 family proteins are evolutionarily conserved regulatory factors that use αβ-tubulin-interacting tumor overexpressed gene (TOG) domains to catalyze fast microtubule growth. Catalysis requires that these polymerases discriminate between unpolymerized and polymerized forms of αβ-tubulin, but the mechanism by which they do so has remained unclear. Here, we report the structure of the TOG1 domain from Stu2p bound to yeast αβ-tubulin. TOG1 binds αβ-tubulin in a way that excludes equivalent binding of a second TOG domain. Furthermore, TOG1 preferentially binds a curved conformation of αβ-tubulin that cannot be incorporated into microtubules, contacting α- and β-tubulin surfaces that do not participate in microtubule assembly. Conformation-selective interactions with αβ-tubulin explain how TOG-containing polymerases discriminate between unpolymerized and polymerized forms of αβ-tubulin and how they selectively recognize the growing end of the microtubule.

    Organizational Affiliation: 

    Department of Biophysics, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX 75390, USA.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Tubulin alpha-1 chainA447Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: TUB1, YML085C
UniProt
Find proteins for P09733 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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Go to UniProtKB:  P09733
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UniProt GroupP09733
Protein Feature View
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Tubulin beta chainB463Saccharomyces cerevisiae S288CMutation(s): 2 
Gene Names: TUB2, YFL037W
EC: 3.6.5.6
UniProt
Find proteins for P02557 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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UniProt GroupP02557
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Protein STU2C278Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: L2108, STU2, YLR045C
UniProt
Find proteins for P46675 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P46675 
Go to UniProtKB:  P46675
Entity Groups  
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UniProt GroupP46675
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GTP
Query on GTP
Download Ideal Coordinates CCD File 
E [auth A],
G [auth B]		GUANOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O14 P3
XKMLYUALXHKNFT-UUOKFMHZSA-N		 Ligand Interaction
MG
Query on MG
Download Ideal Coordinates CCD File 
D [auth A],
F [auth B]		MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.88 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.207 
  • R-Value Observed: 0.210 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 89.12α = 90
b = 98.04β = 100.31
c = 91.366γ = 90
Software Package:
Software NamePurpose
SBC-Collectdata collection
PHENIXmodel building
PHENIXrefinement
HKL-3000data reduction
HKL-3000data scaling
PHENIXphasing

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-08-15
    Type: Initial release
  • Version 1.1: 2013-08-28
    Changes: Database references