6B27

Crystal structure of human STAC2 Tandem SH3 Domains (296-411) in complex with a CaV1.1 II-III loop peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.73 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.179 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural insights into binding of STAC proteins to voltage-gated calcium channels.

Wong King Yuen, S.M.Campiglio, M.Tung, C.C.Flucher, B.E.Van Petegem, F.

(2017) Proc. Natl. Acad. Sci. U.S.A. 114: E9520-E9528

  • DOI: 10.1073/pnas.1708852114
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Excitation-contraction (EC) coupling in skeletal muscle requires functional and mechanical coupling between L-type voltage-gated calcium channels (CaV1.1) and the ryanodine receptor (RyR1). Recently, STAC3 was identified as an essential protein for E ...

    Excitation-contraction (EC) coupling in skeletal muscle requires functional and mechanical coupling between L-type voltage-gated calcium channels (CaV1.1) and the ryanodine receptor (RyR1). Recently, STAC3 was identified as an essential protein for EC coupling and is part of a group of three proteins that can bind and modulate L-type voltage-gated calcium channels. Here, we report crystal structures of tandem-SH3 domains of different STAC isoforms up to 1.2-Å resolution. These form a rigid interaction through a conserved interdomain interface. We identify the linker connecting transmembrane repeats II and III in two different CaV isoforms as a binding site for the SH3 domains and report a crystal structure of the complex with the STAC2 isoform. The interaction site includes the location for a disease variant in STAC3 that has been linked to Native American myopathy (NAM). Introducing the mutation does not cause misfolding of the SH3 domains, but abolishes the interaction. Disruption of the interaction via mutations in the II-III loop perturbs skeletal muscle EC coupling, but preserves the ability of STAC3 to slow down inactivation of CaV1.2.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, University of British Columbia, V6T 1Z3 Vancouver, BC, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SH3 and cysteine-rich domain-containing protein 2
A, B, C, D, E, F
120Homo sapiensMutation(s): 0 
Gene Names: STAC2
Find proteins for Q6ZMT1 (Homo sapiens)
Go to Gene View: STAC2
Go to UniProtKB:  Q6ZMT1
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Voltage-dependent L-type calcium channel subunit alpha-1S
G, H, I, J, K, L
14Homo sapiensMutation(s): 0 
Gene Names: CACNA1S (CACH1, CACN1, CACNL1A3)
Find proteins for Q13698 (Homo sapiens)
Go to Gene View: CACNA1S
Go to UniProtKB:  Q13698
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A, B, C, D, E, F
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
CL
Query on CL

Download SDF File 
Download CCD File 
E
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.73 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.179 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 47.920α = 90.00
b = 114.650β = 90.00
c = 144.678γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
REFMACphasing
REFMACrefinement
SCALEPACKdata scaling
HKL-2000data collection
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Canadian Institutes of Health ResearchCanadaMOP-119608

Revision History 

  • Version 1.0: 2017-10-25
    Type: Initial release
  • Version 1.1: 2017-11-08
    Type: Database references
  • Version 1.2: 2017-11-22
    Type: Database references
  • Version 1.3: 2017-12-06
    Type: Author supporting evidence