1XU1

The crystal structure of APRIL bound to TACI


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.167 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structures of APRIL-receptor complexes: Like BCMA, TACI employs only a single cysteine-rich domain for high-affinity ligand binding

Hymowitz, S.G.Patel, D.R.Wallweber, H.J.A.Runyon, S.Yan, M.Yin, J.Shriver, S.K.Gordon, N.C.Pan, B.Skelton, N.J.Kelley, R.F.Starovasnik, M.A.

(2005) J.Biol.Chem. 280: 7218-7227

  • DOI: 10.1074/jbc.M411714200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • TACI is a member of the tumor necrosis factor receptor superfamily and serves as a key regulator of B cell function. TACI binds two ligands, APRIL and BAFF, with high affinity and contains two cysteine-rich domains (CRDs) in its extracellular region; ...

    TACI is a member of the tumor necrosis factor receptor superfamily and serves as a key regulator of B cell function. TACI binds two ligands, APRIL and BAFF, with high affinity and contains two cysteine-rich domains (CRDs) in its extracellular region; in contrast, BCMA and BR3, the other known high affinity receptors for APRIL and BAFF, respectively, contain only a single or partial CRD. However, another form of TACI exists wherein the N-terminal CRD is removed by alternative splicing. We find that this shorter form is capable of ligand-induced cell signaling and that the second CRD alone (TACI_d2) contains full affinity for both ligands. Furthermore, we report the solution structure and alanine-scanning mutagenesis of TACI_d2 along with co-crystal structures of APRIL.TACI_d2 and APRIL.BCMA complexes that together reveal the mechanism by which TACI engages high affinity ligand binding through a single CRD, and we highlight sources of ligand-receptor specificity within the APRIL/BAFF system.


    Organizational Affiliation

    Department of Protein Engineering, Molecular Oncology, Medicinal Chemistry, and Immunology, Genentech, Inc., South San Francisco, California 94080, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Tumor necrosis factor ligand superfamily member 13
A, B, D
138Mus musculusMutation(s): 0 
Gene Names: Tnfsf13 (April)
Find proteins for Q9D777 (Mus musculus)
Go to UniProtKB:  Q9D777
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Tumor necrosis factor receptor superfamily member 13B
R, S, T
42Homo sapiensMutation(s): 0 
Gene Names: TNFRSF13B (TACI)
Find proteins for O14836 (Homo sapiens)
Go to Gene View: TNFRSF13B
Go to UniProtKB:  O14836
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NI
Query on NI

Download SDF File 
Download CCD File 
A
NICKEL (II) ION
Ni
VEQPNABPJHWNSG-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.167 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 59.339α = 90.00
b = 91.839β = 90.00
c = 102.268γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
SCALEPACKdata scaling
REFMACrefinement
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-11-09
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Advisory, Refinement description, Version format compliance