4Y5J

Drosophila melanogaster Mini spindles TOG3


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.303 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.176 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Drosophila melanogaster Mini Spindles TOG3 Utilizes Unique Structural Elements to Promote Domain Stability and Maintain a TOG1- and TOG2-like Tubulin-binding Surface.

Howard, A.E.Fox, J.C.Slep, K.C.

(2015) J.Biol.Chem. 290: 10149-10162

  • DOI: 10.1074/jbc.M114.633826

  • PubMed Abstract: 
  • Microtubule-associated proteins regulate microtubule (MT) dynamics spatially and temporally, which is essential for proper formation of the bipolar mitotic spindle. The XMAP215 family is comprised of conserved microtubule-associated proteins that use ...

    Microtubule-associated proteins regulate microtubule (MT) dynamics spatially and temporally, which is essential for proper formation of the bipolar mitotic spindle. The XMAP215 family is comprised of conserved microtubule-associated proteins that use an array of tubulin-binding tumor overexpressed gene (TOG) domains, consisting of six (A-F) Huntingtin, elongation factor 3, protein phosphatase 2A, target of rapamycin (HEAT) repeats, to robustly increase MT plus-end polymerization rates. Recent work showed that TOG domains have differentially conserved architectures across the array, with implications for position-dependent TOG domain tubulin binding activities and function within the XMAP215 MT polymerization mechanism. Although TOG domains 1, 2, and 4 are well described, structural and mechanistic information characterizing TOG domains 3 and 5 is outstanding. Here, we present the structure and characterization of Drosophila melanogaster Mini spindles (Msps) TOG3. Msps TOG3 has two unique features as follows: the first is a C-terminal tail that stabilizes the ultimate four HEAT repeats (HRs), and the second is a unique architecture in HR B. Structural alignments of TOG3 with other TOG domain structures show that the architecture of TOG3 is most similar to TOG domains 1 and 2 and diverges from TOG4. Docking TOG3 onto recently solved Stu2 TOG1· and TOG2·tubulin complex structures suggests that TOG3 uses similarly conserved tubulin-binding intra-HEAT loop residues to engage α- and β-tubulin. This indicates that TOG3 has maintained a TOG1- and TOG2-like TOG-tubulin binding mode despite structural divergence. The similarity of TOG domains 1-3 and the divergence of TOG4 suggest that a TOG domain array with polarized structural diversity may play a key mechanistic role in XMAP215-dependent MT polymerization activity.


    Organizational Affiliation

    From the Department of Biochemistry and Biophysics, Program in Molecular and Cellular Biophysics, and.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MINI SPINDLES TOG3
A
248Drosophila melanogasterMutation(s): 0 
Gene Names: msps
Find proteins for Q9VEZ3 (Drosophila melanogaster)
Go to UniProtKB:  Q9VEZ3
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.303 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.176 
  • Space Group: P 32 1 2
Unit Cell:
Length (Å)Angle (°)
a = 49.824α = 90.00
b = 49.824β = 90.00
c = 204.992γ = 120.00
Software Package:
Software NamePurpose
Cootmodel building
HKL-2000data scaling
PHENIXrefinement
HKL-2000data reduction
PHENIXphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical SciencesUnited StatesT32GM008570
National Institutes of Health/National Institute of General Medical SciencesUnited StatesR01GM094415
March of DimesUnited StatesFY14-247

Revision History 

  • Version 1.0: 2015-03-11
    Type: Initial release
  • Version 1.1: 2015-03-18
    Type: Database references
  • Version 1.2: 2015-04-29
    Type: Database references
  • Version 1.3: 2017-08-23
    Type: Data collection, Database references, Derived calculations, Source and taxonomy, Structure summary
  • Version 1.4: 2017-09-20
    Type: Author supporting evidence, Refinement description