Structure of the 2nd TOG domain from yeast CLASP protein STU1

Experimental Data Snapshot

  • Resolution: 1.89 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.173 
  • R-Value Observed: 0.175 

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An isolated CLASP TOG domain suppresses microtubule catastrophe and promotes rescue.

Majumdar, S.Kim, T.Chen, Z.Munyoki, S.Tso, S.C.Brautigam, C.A.Rice, L.M.

(2018) Mol Biol Cell 29: 1359-1375

  • DOI: https://doi.org/10.1091/mbc.E17-12-0748
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Microtubules are heavily regulated dynamic polymers of αβ-tubulin that are required for proper chromosome segregation and organization of the cytoplasm. Polymerases in the XMAP215 family use arrayed TOG domains to promote faster microtubule elongation. Regulatory factors in the cytoplasmic linker associated protein (CLASP) family that reduce catastrophe and/or increase rescue also contain arrayed TOGs, but how CLASP TOGs contribute to activity is poorly understood. Here, using Saccharomyces cerevisiae Stu1 as a model CLASP, we report structural, biochemical, and reconstitution studies that clarify functional properties of CLASP TOGs. The two TOGs in Stu1 have very different tubulin-binding properties: TOG2 binds to both unpolymerized and polymerized tubulin, and TOG1 binds very weakly to either. The structure of Stu1-TOG2 reveals a CLASP-specific residue that likely confers distinctive tubulin-binding properties. The isolated TOG2 domain strongly suppresses microtubule catastrophe and increases microtubule rescue in vitro, contradicting the expectation that regulatory activity requires an array of TOGs. Single point mutations on the tubulin-binding surface of TOG2 ablate its anti-catastrophe and rescue activity in vitro, and Stu1 function in cells. Revealing that an isolated CLASP TOG can regulate polymerization dynamics without being part of an array provides insight into the mechanism of CLASPs and diversifies the understanding of TOG function.

  • Organizational Affiliation

    Department of Microbiology, UT Southwestern Medical Center, Dallas, TX 75390.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Protein STU1320Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: STU1YBL034CYBL0416
Find proteins for P38198 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P38198 
Go to UniProtKB:  P38198
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP38198
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.89 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.173 
  • R-Value Observed: 0.175 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 31.412α = 90
b = 111.009β = 101.36
c = 44.937γ = 90
Software Package:
Software NamePurpose
HKL-3000data reduction
HKL-3000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-01-23
    Type: Initial release