4XC2

Crystal structure of GABARAP in complex with KBTBD6 LIR peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.198 

wwPDB Validation 3D Report Full Report


This is version 2.0 of the entry. See complete history

Literature

CUL3-KBTBD6/KBTBD7 Ubiquitin Ligase Cooperates with GABARAP Proteins to Spatially Restrict TIAM1-RAC1 Signaling.

Genau, H.M.Huber, J.Baschieri, F.Akutsu, M.Dotsch, V.Farhan, H.Rogov, V.Behrends, C.

(2015) Mol.Cell 57: 995-1010

  • DOI: 10.1016/j.molcel.2014.12.040

  • PubMed Abstract: 
  • The small Rho GTPase RAC1 is an essential regulator of cellular signaling that controls actin rearrangements and cell motility. Here, we identify a novel CUL3 RING ubiquitin ligase complex, containing the substrate adaptors KBTBD6 and KBTBD7, that me ...

    The small Rho GTPase RAC1 is an essential regulator of cellular signaling that controls actin rearrangements and cell motility. Here, we identify a novel CUL3 RING ubiquitin ligase complex, containing the substrate adaptors KBTBD6 and KBTBD7, that mediates ubiquitylation and proteasomal degradation of TIAM1, a RAC1-specific GEF. Increasing the abundance of TIAM1 by depletion of KBTBD6 and/or KBTBD7 leads to elevated RAC1 activity, changes in actin morphology, loss of focal adhesions, reduced proliferation, and enhanced invasion. KBTBD6 and KBTBD7 employ ATG8 family-interacting motifs to bind preferentially to GABARAP proteins. Surprisingly, ubiquitylation and degradation of TIAM1 by CUL3(KBTBD6/KBTBD7) depends on its binding to GABARAP proteins. Our study reveals that recruitment of CUL3(KBTBD6/KBTBD7) to GABARAP-containing vesicles regulates the abundance of membrane-associated TIAM1 and subsequently spatially restricted RAC1 signaling. Besides their role in autophagy and trafficking, we uncovered a previously unknown function of GABARAP proteins as membrane-localized signaling scaffolds.


    Organizational Affiliation

    Institute of Biochemistry II, Goethe University School of Medicine, 60590 Frankfurt am Main, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
GABA(A) receptor-associated protein
A, B, C, D
117Homo sapiensMutation(s): 0 
Gene Names: GABARAP (FLC3B)
Find proteins for O95166 (Homo sapiens)
Go to Gene View: GABARAP
Go to UniProtKB:  O95166
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Kelch repeat and BTB domain-containing protein 6
E, F, G, H
11Homo sapiensMutation(s): 0 
Gene Names: KBTBD6
Find proteins for Q86V97 (Homo sapiens)
Go to Gene View: KBTBD6
Go to UniProtKB:  Q86V97
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.198 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 38.893α = 65.30
b = 57.353β = 77.34
c = 67.310γ = 89.95
Software Package:
Software NamePurpose
XDSdata reduction
REFMACrefinement
MOLREPphasing
PDB_EXTRACTdata extraction
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
DKTKGermany--
Cluster of excellence FrankfurtGermany--
German Research FoundationGermanyBE 4685/1-1
European Research CouncilGermany282333
LOEWE Program of the State of HesseGermany--
Leibniz awardGermany--

Revision History 

  • Version 1.0: 2015-03-04
    Type: Initial release
  • Version 1.1: 2015-04-01
    Type: Database references
  • Version 2.0: 2017-09-06
    Type: Atomic model, Author supporting evidence