Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 22.21 kDa 
• Atom Count: 1814 
• Modelled Residue Count: 189 
• Deposited Residue Count: 195 
• Unique protein chains: 1

2BBR

Crystal Structure of MC159 Reveals Molecular Mechanism of DISC Assembly and vFLIP Inhibition

• PDB DOI: 10.2210/pdb2BBR/pdb

• Classification: VIRAL PROTEIN
• Organism(s): Molluscum contagiosum virus subtype 1
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2005-10-17 Released: 2006-02-14 
• Deposition Author(s): Yang, J.K., Wang, L., Zheng, L., Wan, F., Ahmed, M., Lenardo, M.J., Wu, H.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.20 Å
• R-Value Free: 0.226 
• R-Value Work: 0.211 
• R-Value Observed: 0.211 

Literature

Crystal structure of MC159 reveals molecular mechanism of DISC assembly and FLIP inhibition.

Yang, J.K., Wang, L., Zheng, L., Wan, F., Ahmed, M., Lenardo, M.J., Wu, H.

(2005) Mol Cell 20: 939-949

• PubMed: 16364918 
• DOI: 10.1016/j.molcel.2005.10.023
• Primary Citation of Related Structures:  
  2BBR, 2BBZ


• PubMed Abstract: 
  

The death-inducing signaling complex (DISC) comprising Fas, Fas-associated death domain (FADD), and caspase-8/10 is assembled via homotypic associations between death domains (DDs) of Fas and FADD and between death effector domains (DEDs) of FADD and caspase-8/10. Caspase-8/10 and FLICE/caspase-8 inhibitory proteins (FLIPs) that inhibit caspase activation at the DISC level contain tandem DEDs. Here, we report the crystal structure of a viral FLIP, MC159, at 1.2 Angstroms resolution. It reveals a noncanonical fold of DED1, a dumbbell-shaped structure with rigidly associated DEDs and a different mode of interaction in the DD superfamily. Whereas the conserved hydrophobic patch of DED1 interacts with DED2, the corresponding region of DED2 mediates caspase-8 recruitment and contributes to DISC assembly. In contrast, MC159 cooperatively assembles with Fas and FADD via an extensive surface that encompasses the conserved charge triad. This interaction apparently competes with FADD self-association and disrupts higher-order oligomerization required for caspase activation in the DISC.

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Organizational Affiliation: 

Department of Biochemistry, Weill Medical College of Cornell University, New York, New York 10021, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Viral CASP8 and FADD-like apoptosis regulator	A	195	Molluscum contagiosum virus subtype 1	Mutation(s): 0  Gene Names: MC159L, H-H2.2
UniProt
Find proteins for Q98325 (Molluscum contagiosum virus subtype 1) Explore Q98325  Go to UniProtKB:  Q98325

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
AZI	B [auth A]	AZIDE ION N3 IVRMZWNICZWHMI-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.20 Å
• R-Value Free: 0.226 
• R-Value Work: 0.211 
• R-Value Observed: 0.211 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 34.979	α = 90
b = 62.867	β = 90
c = 75.806	γ = 90

Software Package:

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

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2005-10-17 
• Released Date: 2006-02-14 
Deposition Author(s): Yang, J.K., Wang, L., Zheng, L., Wan, F., Ahmed, M., Lenardo, M.J., Wu, H.

Revision History  

• Version 1.0: 2006-02-14
  Type: Initial release
  
• Version 1.1: 2008-05-01
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance