3J2T

An improved model of the human apoptosome


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 9.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Changes in apaf-1 conformation that drive apoptosome assembly.

Yuan, S.Topf, M.Reubold, T.F.Eschenburg, S.Akey, C.W.

(2013) Biochemistry 52: 2319-2327

  • DOI: 10.1021/bi301721g
  • Primary Citation of Related Structures:  
    3J2T

  • PubMed Abstract: 
  • Apoptosome assembly is highly regulated in the intrinsic cell death pathway. To better understand this step, we created an improved model of the human apoptosome using a crystal structure of full length Apaf-1 and a single particle, electron density map at ~9 ...

    Apoptosome assembly is highly regulated in the intrinsic cell death pathway. To better understand this step, we created an improved model of the human apoptosome using a crystal structure of full length Apaf-1 and a single particle, electron density map at ~9.5 Å resolution. The apoptosome model includes N-terminal domains of Apaf-1, cognate β-propellers, and cytochrome c. A direct comparison of Apaf-1 in the apoptosome and as a monomer reveals conformational changes that occur during the first two steps of assembly. This includes an induced-fit mechanism for cytochrome c binding to regulatory β-propellers, which is dependent on shape and charge complementarity, and a large rotation of the nucleotide binding module during nucleotide exchange. These linked conformational changes create an extended Apaf-1 monomer and drive apoptosome assembly. Moreover, the N-terminal CARD in the inactive Apaf-1 monomer is not shielded from other proteins by β-propellers. Hence, the Apaf-1 CARD may be free to interact with a procaspase-9 CARD either before or during apoptosome assembly. Irrespective of the timing, the end product of assembly is a holo-apoptosome with an acentric CARD-CARD disk and tethered pc-9 catalytic domains. Subsequent activation of pc-9 leads to a proteolytic cascade and cell death.


    Related Citations: 
    • Structure of an apoptosome-procaspase-9 CARD complex.
      Yuan, S., Yu, X., Topf, M., Ludtke, S.J., Wang, X., Akey, C.W.
      (2010) Structure 18: 571

    Organizational Affiliation

    Department of Physiology and Biophysics, Boston University School of Medicine, 700 Albany Street, Boston, MA 02118, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Apoptotic protease-activating factor 1A, B, C, D, E, F, G1263Homo sapiensMutation(s): 0 
Gene Names: Apaf-1APAF1KIAA0413
UniProt & NIH Common Fund Data Resources
Find proteins for O14727 (Homo sapiens)
Explore O14727 
Go to UniProtKB:  O14727
PHAROS:  O14727
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome cH, I, J, K, L, M, N104Bos taurusMutation(s): 0 
Gene Names: CYCSCYC
UniProt
Find proteins for P62894 (Bos taurus)
Explore P62894 
Go to UniProtKB:  P62894
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 9.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-04-10
    Type: Initial release
  • Version 1.1: 2013-04-17
    Changes: Database references
  • Version 1.2: 2018-07-18
    Changes: Data collection