2LG1

Solution structure of the human AKAP13 PH domain and stabilizing DH helix


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural Insights into the Activation of the RhoA GTPase by the Lbc Oncoprotein.

Lenoir, M.Sugawara, M.Kaur, J.Ball, L.J.Overduin, M.

(2014) J.Biol.Chem. 3: 215-218

  • DOI: 10.1074/jbc.M114.561787

  • PubMed Abstract: 
  • The small GTPase RhoA promotes deregulated signaling upon interaction with lymphoid blast crisis (Lbc), the oncogenic form of A-kinase anchoring protein 13 (AKAP13). The onco-Lbc protein is a hyperactive Rho-specific guanine nucleotide exchange facto ...

    The small GTPase RhoA promotes deregulated signaling upon interaction with lymphoid blast crisis (Lbc), the oncogenic form of A-kinase anchoring protein 13 (AKAP13). The onco-Lbc protein is a hyperactive Rho-specific guanine nucleotide exchange factor (GEF), but its structural mechanism has not been reported despite its involvement in cardiac hypertrophy and cancer causation. The pleckstrin homology (PH) domain of Lbc is located at the C-terminal end of the protein and is shown here to specifically recognize activated RhoA rather than lipids. The isolated dbl homology (DH) domain can function as an independent activator with an enhanced activity. However, the DH domain normally does not act as a solitary Lbc interface with RhoA-GDP. Instead it is negatively controlled by the PH domain. In particular, the DH helical bundle is coupled to the structurally dependent PH domain through a helical linker, which reduces its activity. Together the two domains form a rigid scaffold in solution as evidenced by small angle x-ray scattering and (1)H,(13)C,(15)N-based NMR spectroscopy. The two domains assume a "chair" shape with its back possessing independent GEF activity and the PH domain providing a broad seat for RhoA-GTP docking rather than membrane recognition. This provides structural and dynamical insights into how DH and PH domains work together in solution to support regulated RhoA activity. Mutational analysis supports the bifunctional PH domain mediation of DH-RhoA interactions and explains why the tandem domain is required for controlled GEF signaling.


    Related Citations: 
    • Resonance assignments of the human AKAP13-PH domain and stabilizing DH helix.
      Sugawara, M.,Whittaker, S.B.,Bishop, S.,Ball, L.,Overduin, M.
      (2009) Biomol.Nmr Assign. 3: 215


    Organizational Affiliation

    From the School of Cancer Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
A-kinase anchor protein 13
A
185Homo sapiensMutation(s): 0 
Gene Names: AKAP13 (BRX, HT31, LBC)
Find proteins for Q12802 (Homo sapiens)
Go to Gene View: AKAP13
Go to UniProtKB:  Q12802
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 
  • Olderado: 2LG1 Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-08-03
    Type: Initial release
  • Version 1.1: 2014-08-13
    Type: Database references