2A5Y

Structure of a CED-4/CED-9 complex

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.249 
  • R-Value Observed: 0.249 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history. 


Literature

Structure of the CED-4-CED-9 complex provides insights into programmed cell death in Caenorhabditis elegans.

Yan, N., Chai, J., Lee, E.S., Gu, L., Liu, Q., He, J., Wu, J.W., Kokel, D., Li, H., Hao, Q., Xue, D., Shi, Y.

(2005) Nature 437: 831-837

  • DOI: 10.1038/nature04002
  • Primary Citation of Related Structures:  
    2A5Y

  • PubMed Abstract: 

    • Interplay among four genes--egl-1, ced-9, ced-4 and ced-3--controls the onset of programmed cell death in the nematode Caenorhabditis elegans. Activation of the cell-killing protease CED-3 requires CED-4. However, CED-4 is constitutively inhibited by CED-9 until its release by EGL-1 ...

    Interplay among four genes--egl-1, ced-9, ced-4 and ced-3--controls the onset of programmed cell death in the nematode Caenorhabditis elegans. Activation of the cell-killing protease CED-3 requires CED-4. However, CED-4 is constitutively inhibited by CED-9 until its release by EGL-1. Here we report the crystal structure of the CED-4-CED-9 complex at 2.6 A resolution, and a complete reconstitution of the CED-3 activation pathway using homogeneous proteins of CED-4, CED-9 and EGL-1. One molecule of CED-9 binds to an asymmetric dimer of CED-4, but specifically recognizes only one of the two CED-4 molecules. This specific interaction prevents CED-4 from activating CED-3. EGL-1 binding induces pronounced conformational changes in CED-9 that result in the dissociation of the CED-4 dimer from CED-9. The released CED-4 dimer further dimerizes to form a tetramer, which facilitates the autoactivation of CED-3. Together, our studies provide important insights into the regulation of cell death activation in C. elegans.

    Organizational Affiliation: 

    Department of Molecular Biology, Princeton University, Lewis Thomas Laboratory, Washington Road, Princeton, New Jersey 08544, USA.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Apoptosis regulator ced-9A204Caenorhabditis elegansMutation(s): 3 
Gene Names: ced-9, T07C4.8
Find proteins for P41958 (Caenorhabditis elegans)
Explore P41958 
Go to UniProtKB:  P41958
Protein Feature View
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  • Reference Sequence
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
ced-4B, C549Caenorhabditis elegansMutation(s): 0 
Gene Names: ced-4, C35D10.9
Find proteins for P30429 (Caenorhabditis elegans)
Explore P30429 
Go to UniProtKB:  P30429
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ATP
Query on ATP
Download Ideal Coordinates CCD File 
 E [auth B], G [auth C]ADENOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O13 P3
ZKHQWZAMYRWXGA-KQYNXXCUSA-N		 Ligand Interaction
MG
Query on MG
Download Ideal Coordinates CCD File 
 D [auth B], F [auth C]MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.249 
  • R-Value Observed: 0.249 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 128.898α = 90
b = 128.898β = 90
c = 209.928γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
SCALEPACKdata scaling
SOLVEphasing
CNSrefinement
HKL-2000data reduction

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-10-11
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance