3H11

Zymogen caspase-8:c-FLIPL protease domain complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.212 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Mechanism of procaspase-8 activation by c-FLIPL.

Yu, J.W.Jeffrey, P.D.Shi, Y.

(2009) Proc.Natl.Acad.Sci.USA 106: 8169-8174

  • DOI: 10.1073/pnas.0812453106
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Cellular FLICE-inhibitory protein (c-FLIP(L)) is a key regulator of the extrinsic cell death pathway. Although widely regarded as an inhibitor of initiator caspase activation and cell death, c-FLIP(L) is also capable of enhancing procaspase-8 activat ...

    Cellular FLICE-inhibitory protein (c-FLIP(L)) is a key regulator of the extrinsic cell death pathway. Although widely regarded as an inhibitor of initiator caspase activation and cell death, c-FLIP(L) is also capable of enhancing procaspase-8 activation through heterodimerization of their respective protease domains. However, the underlying mechanism of this activation process remains enigmatic. Here, we demonstrate that cleavage of the intersubunit linker of c-FLIP(L) by procaspase-8 potentiates the activation process by enhancing heterodimerization between the two proteins and vastly improving the proteolytic activity of unprocessed caspase-(C)8. The crystal structures of the protease-like domain of c-FLIP(L) alone and in complex with zymogen C8 identify the unique determinants that favor heterodimerization over procaspase-8 homodimerization, and induce the latent active site of zymogen C8 into a productive conformation. Together, these findings provide molecular insights into a key aspect of c-FLIP(L) function that modulates procaspase-8 activation to elicit diverse responses in different cellular contexts.


    Organizational Affiliation

    Department of Molecular Biology, Lewis Thomas Laboratory, Princeton University, Princeton, NJ 08544, USA. jwyu@princeton.edu




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CASP8 and FADD-like apoptosis regulator
A
272Homo sapiensMutation(s): 0 
Gene Names: CFLAR (CASH, CASP8AP1, CLARP, MRIT)
Find proteins for O15519 (Homo sapiens)
Go to Gene View: CFLAR
Go to UniProtKB:  O15519
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Caspase-8
B
271Homo sapiensMutation(s): 2 
Gene Names: CASP8 (MCH5)
EC: 3.4.22.61
Find proteins for Q14790 (Homo sapiens)
Go to Gene View: CASP8
Go to UniProtKB:  Q14790
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
IETD aldehyde inhibitor
C
5N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
ASA
Query on ASA
C
L-PEPTIDE LINKINGC4 H7 N O3ASP
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.212 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 52.990α = 90.00
b = 76.680β = 90.00
c = 114.190γ = 90.00
Software Package:
Software NamePurpose
CBASSdata collection
CNSrefinement
PHASERphasing
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-04-28
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance