Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Hetero 4-mer - A2B2 

Biological assembly 1 assigned by authors and generated by PQS (software)

Macromolecule Content

• Total Structure Weight: 136655.95 
• Atom Count: 8879 
• Residue Count: 1234 
• Unique protein chains: 2

2C5D

Structure of a minimal Gas6-Axl complex

• DOI: 10.2210/pdb2C5D/pdb

• Classification: SIGNALING PROTEIN/RECEPTOR
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21, Homo sapiens


• Deposited: 2005-10-26 Released: 2005-12-19 
• Deposition Author(s): Sasaki, T., Knyazev, P.G., Clout, N.J., Cheburkin, Y., Goehring, W., Ullrich, A., Timpl, R., Hohenester, E.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.3 Å
• R-Value Free: 0.265 
• R-Value Work: 0.241 

Literature

Structural Basis for Gas6-Axl Signalling.

Sasaki, T., Knyazev, P.G., Clout, N.J., Cheburkin, Y., Goehring, W., Ullrich, A., Timpl, R., Hohenester, E.

(2006) Embo J. 25: 80

• PubMed: 16362042 
• DOI: 10.1038/sj.emboj.7600912


• PubMed Abstract: 
  

Receptor tyrosine kinases of the Axl family are activated by the vitamin K-dependent protein Gas6. Axl signalling plays important roles in cancer, spermatogenesis, immunity, and platelet function. The crystal structure at 3.3 A resolution of a minimal human Gas6/Axl complex reveals an assembly of 2:2 stoichiometry, in which the two immunoglobulin-like domains of the Axl ectodomain are crosslinked by the first laminin G-like domain of Gas6, with no direct Axl/Axl or Gas6/Gas6 contacts. There are two distinct Gas6/Axl contacts of very different size, both featuring interactions between edge beta-strands. Structure-based mutagenesis, protein binding assays and receptor activation experiments demonstrate that both the major and minor Gas6 binding sites are required for productive transmembrane signalling. Gas6-mediated Axl dimerisation is likely to occur in two steps, with a high-affinity 1:1 Gas6/Axl complex forming first. Only the minor Gas6 binding site is highly conserved in the other Axl family receptors, Sky/Tyro3 and Mer. Specificity at the major contact is suggested to result from the segregation of charged and apolar residues to opposite faces of the newly formed beta-sheet.

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Related Citations: 

• Ligand Recognition and Homophilic Interactions in Tyro3
  Heiring, C.,Dahlback, B.,Muller, Y.A.
  (2004) J.Biol.Chem. 279: 6952
• Crystal Structure of a C-Terminal Fragment of Growth Arrest-Specific Protein Gas6
  Sasaki, T.,Knyazev, P.G.,Cheburkin, Y.,Goehring, W.,Tisi, D.,Ullrich, A.,Timpl, R.,Hohenester, E.
  (2002) J.Biol.Chem. 277: 44164




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Organizational Affiliation: 

Max-Planck-Institut für Biochemie, Martinsried, Germany.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
GROWTH-ARREST-SPECIFIC PROTEIN 6 PRECURSOR	A, B	422	Homo sapiens	Mutation(s): 0  Gene Names: GAS6 (AXLLG)
Find proteins for Q14393 (Homo sapiens) Go to Gene View: GAS6 Go to UniProtKB:  Q14393

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
TYROSINE-PROTEIN KINASE RECEPTOR UFO	C, D	195	Homo sapiens	Mutation(s): 0  Gene Names: AXL (UFO) EC: 2.7.10.1
Find proteins for P30530 (Homo sapiens) Go to Gene View: AXL Go to UniProtKB:  P30530

Small Molecules

Ligands 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
SO4	C	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
CA	A, B	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N
NAG	A, B	N-ACETYL-D-GLUCOSAMINE C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N
NI	C, D	NICKEL (II) ION Ni VEQPNABPJHWNSG-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.3 Å
• R-Value Free: 0.265 
• R-Value Work: 0.241 
• Space Group: P 6₁

Unit Cell:

Length (Å)	Angle (°)
a = 292.951	α = 90.00
b = 292.951	β = 90.00
c = 63.951	γ = 120.00

Software Package:

Software Name	Purpose
SCALA	data scaling
MOSFLM	data reduction
CNS	refinement
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2005-10-26 
• Released Date: 2005-12-19 
• Deposition Author(s): Sasaki, T., Knyazev, P.G., Clout, N.J., Cheburkin, Y., Goehring, W., Ullrich, A., Timpl, R., Hohenester, E.

Revision History 

• Version 1.0: 2005-12-19
  Type: Initial release
• Version 1.1: 2011-05-08
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance