Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Cyclic - C3  (3D View)
Global Stoichiometry: Homo 3-mer - A3 

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

Macromolecule Content

• Total Structure Weight: 15.71 kDa 
• Atom Count: 1050 
• Residue Count: 130 
• Unique protein chains: 1

1U5X

Crystal structure of murine APRIL at pH 5.0

• DOI: 10.2210/pdb1U5X/pdb

• Classification: CYTOKINE, HORMONE/GROWTH FACTOR
• Organism(s): Mus musculus
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2004-07-28 Released: 2004-10-12 
• Deposition Author(s): Wallweber, H.J., Compaan, D.M., Starovasnik, M.A., Hymowitz, S.G.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 0.256 
• R-Value Work: 0.214 
• R-Value Observed: 0.218 

Literature

The Crystal Structure of A Proliferation-inducing Ligand, APRIL.

Wallweber, H.J., Compaan, D.M., Starovasnik, M.A., Hymowitz, S.G.

(2004) J Mol Biol 343: 283-290

• PubMed: 15451660 
• DOI: 10.1016/j.jmb.2004.08.040
• Structures With Same Primary Citation


• PubMed Abstract: 
  

A proliferation-inducing ligand (APRIL) is a TNF-like cytokine that stimulates tumor cell growth. Within the TNF ligand superfamily, APRIL is most similar to B-cell activation factor (BAFF) with which it shares 30% sequence identity. APRIL binds the receptors B-cell maturation antigen (BCMA) and TACI with high affinity; both of these receptors have also been shown to bind BAFF, although BCMA has significantly higher affinity for APRIL than BAFF. Determination of the crystal structure of APRIL from three crystallization conditions at resolutions of 1.8-2.4A over a pH range from 5.0 to 8.5 reveals a compact trimeric ligand with a backbone fold very similar to that of BAFF (1.1A RMSD over 122 structurally equivalent Calpha atoms), with the exception of differences in the AA' and DE loop regions. Whereas BAFF has been shown to form 20-trimer assemblies under certain conditions, the molecular determinants required for BAFF-like assemblies are absent in the APRIL structure. No crystal packing suggestive of the formation of higher-order assemblies is seen in any of the crystal forms nor does the structure vary significantly between pH 5.0 and 8.5. Modeling of the APRIL-BCMA complex shows the resulting interface is in agreement with mutagenesis data.

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Organizational Affiliation: 

Department of Protein Engineering, Genentech, Inc., 1 DNA Way, South San Francisco, CA 94080, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Tumor necrosis factor ligand superfamily member 13	A	140	Mus musculus	Mutation(s): 0  Gene Names: Tnfsf13, April
Find proteins for Q9D777 (Mus musculus) Explore Q9D777  Go to UniProtKB:  Q9D777

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 0.256 
• R-Value Work: 0.214 
• R-Value Observed: 0.218 
• Space Group: I 2 3

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 90.779	α = 90
b = 90.779	β = 90
c = 90.779	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
DENZO	data reduction
SCALEPACK	data scaling
AMoRE	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-07-28 
• Released Date: 2004-10-12 
Deposition Author(s): Wallweber, H.J., Compaan, D.M., Starovasnik, M.A., Hymowitz, S.G.

Revision History 

• Version 1.0: 2004-10-12
  Type: Initial release
  
• Version 1.1: 2008-04-30
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Advisory, Derived calculations, Version format compliance