3SEI

Crystal Structure of Caskin1 Tandem SAMs


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.201 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Tandem SAM domain structure of human Caskin1: a presynaptic, self-assembling scaffold for CASK.

Stafford, R.L.Hinde, E.Knight, M.J.Pennella, M.A.Ear, J.Digman, M.A.Gratton, E.Bowie, J.U.

(2011) Structure 19: 1826-1836

  • DOI: 10.1016/j.str.2011.09.018
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The synaptic scaffolding proteins CASK and Caskin1 are part of the fibrous mesh of proteins that organize the active zones of neural synapses. CASK binds to a region of Caskin1 called the CASK interaction domain (CID). Adjacent to the CID, Caskin1 co ...

    The synaptic scaffolding proteins CASK and Caskin1 are part of the fibrous mesh of proteins that organize the active zones of neural synapses. CASK binds to a region of Caskin1 called the CASK interaction domain (CID). Adjacent to the CID, Caskin1 contains two tandem sterile α motif (SAM) domains. Many SAM domains form polymers so they are good candidates for forming the fibrous structures seen in the active zone. We show here that the SAM domains of Caskin1 form a new type of SAM helical polymer. The Caskin1 polymer interface exhibits a remarkable segregation of charged residues, resulting in a high sensitivity to ionic strength in vitro. The Caskin1 polymers can be decorated with CASK proteins, illustrating how these proteins may work together to organize the cytomatrix in active zones.


    Organizational Affiliation

    Department of Chemistry and Biochemistry, UCLA-DOE Institute of Genomics and Proteomics, Molecular Biology Institute, University of California, Los Angeles, Los Angeles, CA 90095-1570, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Caskin-1
A, B
149Homo sapiensMutation(s): 0 
Gene Names: CASKIN1 (KIAA1306)
Find proteins for Q8WXD9 (Homo sapiens)
Go to Gene View: CASKIN1
Go to UniProtKB:  Q8WXD9
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
CL
Query on CL

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.201 
  • Space Group: P 41
Unit Cell:
Length (Å)Angle (°)
a = 93.114α = 90.00
b = 93.114β = 90.00
c = 39.750γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
REFMACrefinement
ADSCdata collection
PDB_EXTRACTdata extraction
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-12-14
    Type: Initial release
  • Version 1.1: 2012-03-28
    Type: Database references