3B13

Crystal structure of the DHR-2 domain of DOCK2 in complex with Rac1 (T17N mutant)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.01 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.185 

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Literature

Structural basis for mutual relief of the Rac guanine nucleotide exchange factor DOCK2 and its partner ELMO1 from their autoinhibited forms.

Hanawa-Suetsugu, K.Kukimoto-Niino, M.Mishima-Tsumagari, C.Akasaka, R.Ohsawa, N.Sekine, S.Ito, T.Tochio, N.Koshiba, S.Kigawa, T.Terada, T.Shirouzu, M.Nishikimi, A.Uruno, T.Katakai, T.Kinashi, T.Kohda, D.Fukui, Y.Yokoyama, S.

(2012) Proc Natl Acad Sci U S A 109: 3305-3310

  • DOI: 10.1073/pnas.1113512109
  • Primary Citation of Related Structures:  
    2RQR, 3A98, 3B13

  • PubMed Abstract: 
  • DOCK2, a hematopoietic cell-specific, atypical guanine nucleotide exchange factor, controls lymphocyte migration through ras-related C3 botulinum toxin substrate (Rac) activation. Dedicator of cytokinesis 2-engulfment and cell motility protein 1 (DOCK2•ELMO1) complex formation is required for DOCK2-mediated Rac signaling ...

    DOCK2, a hematopoietic cell-specific, atypical guanine nucleotide exchange factor, controls lymphocyte migration through ras-related C3 botulinum toxin substrate (Rac) activation. Dedicator of cytokinesis 2-engulfment and cell motility protein 1 (DOCK2•ELMO1) complex formation is required for DOCK2-mediated Rac signaling. In this study, we identified the N-terminal 177-residue fragment and the C-terminal 196-residue fragment of human DOCK2 and ELMO1, respectively, as the mutual binding regions, and solved the crystal structure of their complex at 2.1-Å resolution. The C-terminal Pro-rich tail of ELMO1 winds around the Src-homology 3 domain of DOCK2, and an intermolecular five-helix bundle is formed. Overall, the entire regions of both DOCK2 and ELMO1 assemble to create a rigid structure, which is required for the DOCK2•ELMO1 binding, as revealed by mutagenesis. Intriguingly, the DOCK2•ELMO1 interface hydrophobically buries a residue which, when mutated, reportedly relieves DOCK180 from autoinhibition. We demonstrated that the ELMO-interacting region and the DOCK-homology region 2 guanine nucleotide exchange factor domain of DOCK2 associate with each other for the autoinhibition, and that the assembly with ELMO1 weakens the interaction, relieving DOCK2 from the autoinhibition. The interactions between the N- and C-terminal regions of ELMO1 reportedly cause its autoinhibition, and binding with a DOCK protein relieves the autoinhibition for ras homolog gene family, member G binding and membrane localization. In fact, the DOCK2•ELMO1 interface also buries the ELMO1 residues required for the autoinhibition within the hydrophobic core of the helix bundle. Therefore, the present complex structure reveals the structural basis by which DOCK2 and ELMO1 mutually relieve their autoinhibition for the activation of Rac1 for lymphocyte chemotaxis.


    Organizational Affiliation

    RIKEN Systems and Structural Biology Center, 1-7-22 Suehiro, Tsurumi, Yokohama 230-0045, Japan.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Dedicator of cytokinesis protein 2A, C431Homo sapiensMutation(s): 0 
Gene Names: DOCK2KIAA0209
Find proteins for Q92608 (Homo sapiens)
Explore Q92608 
Go to UniProtKB:  Q92608
NIH Common Fund Data Resources
PHAROS:  Q92608
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Ras-related C3 botulinum toxin substrate 1B, D184Homo sapiensMutation(s): 1 
Gene Names: RAC1TC25MIG5
EC: 3.6.5.2
Find proteins for P63000 (Homo sapiens)
Explore P63000 
Go to UniProtKB:  P63000
NIH Common Fund Data Resources
PHAROS:  P63000
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.01 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.185 
  • Space Group: P 65
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 168.651α = 90
b = 168.651β = 90
c = 129.718γ = 120
Software Package:
Software NamePurpose
PHASERphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-03-14
    Type: Initial release