Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Biological Assembly 2  

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

Biological assembly 2 assigned by authors.

Macromolecule Content

• Total Structure Weight: 29.11 kDa 
• Atom Count: 2,017 
• Modelled Residue Count: 224 
• Deposited Residue Count: 240 
• Unique protein chains: 1

 1XTN

crystal structure of CISK-PX domain with sulfates

• PDB DOI:  https://doi.org/10.2210/pdb1XTN/pdb

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


• Deposited: 2004-10-22 Released: 2004-11-02 
• 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: 2.20 Å
• R-Value Free: 0.240 
• R-Value Work: 0.200 
• R-Value Observed: 0.200 

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 Biol Chem 279: 30662-30669

• PubMed: 15126499 
• DOI: https://doi.org/10.1074/jbc.M404107200
• Primary Citation of 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.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Serine/threonine-protein kinase Sgk3	A, B	120	Mus musculus	Mutation(s): 0  Gene Names: Sgkl, Cisk, Sgk3 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

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	C [auth A], D [auth A], E [auth B], F [auth B]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.240 
• R-Value Work: 0.200 
• R-Value Observed: 0.200 
• Space Group: P 2₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 114.139	α = 90
b = 45.002	β = 90
c = 59.202	γ = 90

Software Package:

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

Structure Validation

Entry History 

Deposition Data

• Released Date: 2004-11-02 
Deposition Author(s): Xing, Y., Liu, D., Zhang, R., Joachimiak, A., Songyang, Z., Xu, W.

Revision History  

• Version 1.0: 2004-11-02
  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