1XTE | pdb_00001xte

crystal structure of CISK-PX domain

• PDB DOI: https://doi.org/10.2210/pdb1XTE/pdb

• Classification: TRANSFERASE
• Organism(s): Mus musculus
• Expression System: Escherichia coli BL21
• Mutation(s): No 


• Deposited: 2004-10-21 Released: 2004-11-16 
• Deposition Author(s): Xing, Y., Liu, D., Zhang, R., Joachimiak, A., Songyang, Z., Xu, W.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free: 
  0.220 (Depositor), 0.223 (DCC) 
• R-Value Work: 
  0.187 (Depositor), 0.190 (DCC) 
• R-Value Observed: 
  0.187 (Depositor) 

Literature

Structural basis of membrane targeting by the Phox homology domain of cytokine-independent survival kinase (CISK-PX)

Xing, Y., Liu, D., Zhang, R., Joachimiak, A., Songyang, Z., Xu, W.

(2004) J Biological Chem 279: 30662-30669

• PubMed: 15126499 
• DOI: https://doi.org/10.1074/jbc.M404107200
• Primary Citation Related Structures: 
  1XTE, 1XTN


• PubMed Abstract: 
  

  The cytokine-independent survival kinase (CISK) in the serum and glucocorticoid-regulated kinase family plays an important role in mediating cell growth and survival. N-terminal to its catalytic kinase domain, CISK contains a phox homology (PX) domain, a phosphoinositide-binding motif that directs the membrane localization of CISK and regulates CISK activity. We have determined the crystal structures of the mouse CISK-PX domain to unravel the structural basis of membrane targeting of CISK. In addition to the specific interactions conferred by the phosphoinositide-binding pocket, the structure suggests that a hydrophobic loop region and a hydrophilic beta-turn contribute to the interactions with the membrane. Furthermore, biochemical studies reveal that CISK-PX dimerizes in the presence of the linker between the PX domain and kinase domain, suggesting a multivalent mechanism in membrane localization of CISK.

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Organizational Affiliation: 
• Department of Biological Structure, University of Washington, Seattle, Washington 98195-7420, USA.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 18.02 kDa 
• Atom Count: 1,110 
• Modeled Residue Count: 116 
• Deposited Residue Count: 154 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Serine/threonine-protein kinase Sgk3	A	154	Mus musculus	Mutation(s): 0  Gene Names: Cisk EC: 2.7.1.37 (PDB Primary Data), 2.7.11.1 (UniProt)
UniProt
Find proteins for Q9ERE3 (Mus musculus) Explore Q9ERE3  Go to UniProtKB:  Q9ERE3

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free:  0.220 (Depositor), 0.223 (DCC) 
• R-Value Work:  0.187 (Depositor), 0.190 (DCC) 
• R-Value Observed: 0.187 (Depositor) 

Space Group: I 4

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 74.954	α = 90
b = 74.954	β = 90
c = 51.697	γ = 90

Software Package:

Software Name	Purpose
CNS	refinement
HKL-2000	data reduction
SCALEPACK	data scaling
SOLVE	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2004-11-16 
Deposition Author(s): Xing, Y., Liu, D., Zhang, R., Joachimiak, A., Songyang, Z., Xu, W.

Revision History  

• Version 1.0: 2004-11-16
  Type: Initial release
  
• Version 1.1: 2008-04-30
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2018-01-24
  Changes: Database references, Structure summary
• Version 1.4: 2024-02-14
  Changes: Data collection, Database references