6EEB

Calmodulin in complex with malbrancheamide

  • Classification: METAL BINDING PROTEIN
  • Organism(s): Homo sapiens
  • Expression System: Escherichia coli BL21(DE3)
  • Mutation(s): No 

  • Deposited: 2018-08-13 Released: 2019-08-07 
  • Deposition Author(s): Beyett, T.S., Fraley, A.E., Tesmer, J.J.G.
  • Funding Organization(s): National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI), National Institutes of Health/National Cancer Institute (NIH/NCI), National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.96 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.219 

Starting Model: experimental
View more details

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history


Literature

Perturbation of the interactions of calmodulin with GRK5 using a natural product chemical probe.

Beyett, T.S.Fraley, A.E.Labudde, E.Patra, D.Coleman, R.C.Eguchi, A.Glukhova, A.Chen, Q.Williams, R.M.Koch, W.J.Sherman, D.H.Tesmer, J.J.G.

(2019) Proc Natl Acad Sci U S A 116: 15895-15900

  • DOI: https://doi.org/10.1073/pnas.1818547116
  • Primary Citation of Related Structures:  
    6EEB, 6O5G

  • PubMed Abstract: 

    G protein-coupled receptor (GPCR) kinases (GRKs) are responsible for initiating desensitization of activated GPCRs. GRK5 is potently inhibited by the calcium-sensing protein calmodulin (CaM), which leads to nuclear translocation of GRK5 and promotion of cardiac hypertrophy. Herein, we report the architecture of the Ca 2+ ·CaM-GRK5 complex determined by small-angle X-ray scattering and negative-stain electron microscopy. Ca 2+ ·CaM binds primarily to the small lobe of the kinase domain of GRK5 near elements critical for receptor interaction and membrane association, thereby inhibiting receptor phosphorylation while activating the kinase for phosphorylation of soluble substrates. To define the role of each lobe of Ca 2+ ·CaM, we utilized the natural product malbrancheamide as a chemical probe to show that the C-terminal lobe of Ca 2+ ·CaM regulates membrane binding while the N-terminal lobe regulates receptor phosphorylation and kinase domain activation. In cells, malbrancheamide attenuated GRK5 nuclear translocation and effectively blocked the hypertrophic response, demonstrating the utility of this natural product and its derivatives in probing Ca 2+ ·CaM-dependent hypertrophy.


  • Organizational Affiliation

    Program in Chemical Biology, University of Michigan, Ann Arbor, MI 48109.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Calmodulin-1152Homo sapiensMutation(s): 0 
Gene Names: CALM1CALMCAMCAM1
UniProt & NIH Common Fund Data Resources
Find proteins for P0DP23 (Homo sapiens)
Explore P0DP23 
Go to UniProtKB:  P0DP23
PHAROS:  P0DP23
GTEx:  ENSG00000198668 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0DP23
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.96 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.219 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 49.113α = 90
b = 56.88β = 90
c = 116.781γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
Aimlessdata scaling
PDB_EXTRACTdata extraction
Cootmodel building
PHASERphasing
DIALSdata reduction

Structure Validation

View Full Validation Report



Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)United StatesHL071818
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)United StatesHL122416
National Institutes of Health/National Cancer Institute (NIH/NCI)United StatesCA70375
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM118101

Revision History  (Full details and data files)

  • Version 1.0: 2019-08-07
    Type: Initial release
  • Version 1.1: 2019-08-21
    Changes: Data collection, Database references
  • Version 1.2: 2019-12-04
    Changes: Author supporting evidence
  • Version 1.3: 2023-10-11
    Changes: Data collection, Database references, Derived calculations, Refinement description