4V0C

Crystal Structure of the Kv7.1 proximal C-terminal Domain in Complex with Calmodulin

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.86 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.226 
  • R-Value Observed: 0.228 

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This is version 1.1 of the entry. See complete history. 


Literature

Structural Basis of a Kv7.1 Potassium Channel Gating Module: Studies of the Intracellular C-Terminal Domain in Complex with Calmodulin.

Sachyani, D., Dvir, M., Strulovich, R., Tria, G., Tobelaim, W., Peretz, A., Pongs, O., Svergun, D., Attali, B., Hirsch, J.A.

(2014) Structure 22: 1582

  • DOI: 10.1016/j.str.2014.07.016
  • Primary Citation of Related Structures:  
    4UMO, 4V0C

  • PubMed Abstract: 

    • Kv7 channels tune neuronal and cardiomyocyte excitability. In addition to the channel membrane domain, they also have a unique intracellular C-terminal (CT) domain, bound constitutively to calmodulin (CaM). This CT domain regulates gating and tetramerization ...

    Kv7 channels tune neuronal and cardiomyocyte excitability. In addition to the channel membrane domain, they also have a unique intracellular C-terminal (CT) domain, bound constitutively to calmodulin (CaM). This CT domain regulates gating and tetramerization. We investigated the structure of the membrane proximal CT module in complex with CaM by X-ray crystallography. The results show how the CaM intimately hugs a two-helical bundle, explaining many channelopathic mutations. Structure-based mutagenesis of this module in the context of concatemeric tetramer channels and functional analysis along with in vitro data lead us to propose that one CaM binds to one individual protomer, without crosslinking subunits and that this configuration is required for proper channel expression and function. Molecular modeling of the CT/CaM complex in conjunction with small-angle X-ray scattering suggests that the membrane proximal region, having a rigid lever arm, is a critical gating regulator.

    Organizational Affiliation: 

    Laboratory of Cell Biology, Howard Hughes Medical Institute, The Rockefeller University, 1230 York Avenue, New York, NY 10065, USA. hshi@rockefeller.edu



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
POTASSIUM VOLTAGE-GATED CHANNEL SUBFAMILY KQT MEMBER 1A, B112Homo sapiensMutation(s): 2 
Gene Names: KCNQ1, KCNA8, KCNA9, KVLQT1
UniProt & NIH Common Fund Data Resources
Find proteins for P51787 (Homo sapiens)
Explore P51787 
Go to UniProtKB:  P51787
PHAROS:  P51787
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP51787
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
CALMODULINC, D149Homo sapiensMutation(s): 0 
Gene Names: CALM1, CALM, CAM, CAM1
UniProt & NIH Common Fund Data Resources
Find proteins for P0DP23 (Homo sapiens)
Explore P0DP23 
Go to UniProtKB:  P0DP23
PHAROS:  P0DP23
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0DP23
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.86 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.226 
  • R-Value Observed: 0.228 
  • Space Group: P 65
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 152.092α = 90
b = 152.092β = 90
c = 56.33γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PHENIXphasing
SHARPphasing
PHENIXrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-11-05
    Type: Initial release
  • Version 1.1: 2014-12-17
    Changes: Database references