6B8N

Crystal Structure of the Ca2+/CaM:Kv7.4 (KCNQ4) AB Domain Complex, 10 uM CaCl2 soak

  • Classification: METAL TRANSPORT
  • Organism(s): Homo sapiens
  • Expression System: Escherichia coli
  • Mutation(s): No 

  • Deposited: 2017-10-09 Released: 2018-03-14 
  • Deposition Author(s): Chang, A., Minor, D.L.
  • Funding Organization(s): National Institutes of Health/Eunice Kennedy Shriver National Institute of Child Health & Human Development (NIH/NICHD)

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.221 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

A Calmodulin C-Lobe Ca

Chang, A.Abderemane-Ali, F.Hura, G.L.Rossen, N.D.Gate, R.E.Minor, D.L.

(2018) Neuron 97: 836-852.e6

  • DOI: 10.1016/j.neuron.2018.01.035
  • Primary Citation of Related Structures:  
    6B8M, 6B8L, 6B8N, 6B8Q, 6B8P

  • PubMed Abstract: 
  • Kv7 (KCNQ) voltage-gated potassium channels control excitability in the brain, heart, and ear. Calmodulin (CaM) is crucial for Kv7 function, but how this calcium sensor affects activity has remained unclear. Here, we present X-ray crystallographic analysis of CaM:Kv7 ...

    Kv7 (KCNQ) voltage-gated potassium channels control excitability in the brain, heart, and ear. Calmodulin (CaM) is crucial for Kv7 function, but how this calcium sensor affects activity has remained unclear. Here, we present X-ray crystallographic analysis of CaM:Kv7.4 and CaM:Kv7.5 AB domain complexes that reveal an Apo/CaM clamp conformation and calcium binding preferences. These structures, combined with small-angle X-ray scattering, biochemical, and functional studies, establish a regulatory mechanism for Kv7 CaM modulation based on a common architecture in which a CaM C-lobe calcium-dependent switch releases a shared Apo/CaM clamp conformation. This C-lobe switch inhibits voltage-dependent activation of Kv7.4 and Kv7.5 but facilitates Kv7.1, demonstrating that mechanism is shared by Kv7 isoforms despite the different directions of CaM modulation. Our findings provide a unified framework for understanding how CaM controls different Kv7 isoforms and highlight the role of membrane proximal domains for controlling voltage-gated channel function. VIDEO ABSTRACT.


    Organizational Affiliation

    Cardiovascular Research Institute, University of California San Francisco, San Francisco, CA 94158, USA; Molecular Biophysics and Integrated Bio-imaging Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA; Departments of Biochemistry and Biophysics, and Cellular and Molecular Pharmacology, University of California San Francisco, San Francisco, CA 94158, USA; California Institute for Quantitative Biomedical Research, University of California San Francisco, San Francisco, CA 94158, USA; Kavli Institute for Fundamental Neuroscience, University of California San Francisco, San Francisco, CA 94158, USA. Electronic address: daniel.minor@ucsf.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Potassium voltage-gated channel subfamily KQT member 4A, C, E, G82Homo sapiensMutation(s): 0 
Gene Names: KCNQ4
UniProt & NIH Common Fund Data Resources
Find proteins for P56696 (Homo sapiens)
Explore P56696 
Go to UniProtKB:  P56696
PHAROS:  P56696
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Calmodulin-1B, D, F, H149Homo 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
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.221 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 108.299α = 90
b = 143.382β = 90
c = 164.469γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
XDSdata reduction
PHENIXphasing

Structure Validation

View Full Validation Report




Entry History & Funding Information

Deposition Data

  • Deposited Date: 2017-10-09 
  • Released Date: 2018-03-14 
  • Deposition Author(s): Chang, A., Minor, D.L.

Funding OrganizationLocationGrant Number
National Institutes of Health/Eunice Kennedy Shriver National Institute of Child Health & Human Development (NIH/NICHD)United StatesR01 DC007664

Revision History  (Full details and data files)

  • Version 1.0: 2018-03-14
    Type: Initial release
  • Version 1.1: 2019-12-11
    Changes: Author supporting evidence