6GKG

Structure of 14-3-3 gamma in complex with caspase-2 14-3-3 binding motif Ser164


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.85 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.231 
  • R-Value Observed: 0.233 

wwPDB Validation   3D Report Full Report


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Literature

14-3-3 protein masks the nuclear localization sequence of caspase-2.

Smidova, A.Alblova, M.Kalabova, D.Psenakova, K.Rosulek, M.Herman, P.Obsil, T.Obsilova, V.

(2018) FEBS J 285: 4196-4213

  • DOI: 10.1111/febs.14670
  • Primary Citation of Related Structures:  
    6GKG, 6GKF

  • PubMed Abstract: 
  • Caspase-2 is an apical protease responsible for the proteolysis of cellular substrates directly involved in mediating apoptotic signaling cascades. Caspase-2 activation is inhibited by phosphorylation followed by binding to the scaffolding protein 14-3-3 ...

    Caspase-2 is an apical protease responsible for the proteolysis of cellular substrates directly involved in mediating apoptotic signaling cascades. Caspase-2 activation is inhibited by phosphorylation followed by binding to the scaffolding protein 14-3-3, which recognizes two phosphoserines located in the linker between the caspase recruitment domain and the p19 domains of the caspase-2 zymogen. However, the structural details of this interaction and the exact role of 14-3-3 in the regulation of caspase-2 activation remain unclear. Moreover, the caspase-2 region with both 14-3-3-binding motifs also contains the nuclear localization sequence (NLS), thus suggesting that 14-3-3 binding may regulate the subcellular localization of caspase-2. Here, we report a structural analysis of the 14-3-3ζ:caspase-2 complex using a combined approach based on small angle X-ray scattering, NMR, chemical cross-linking, and fluorescence spectroscopy. The structural model proposed in this study suggests that phosphorylated caspase-2 and 14-3-3ζ form a compact and rigid complex in which the p19 and the p12 domains of caspase-2 are positioned within the central channel of the 14-3-3 dimer and stabilized through interactions with the C-terminal helices of both 14-3-3ζ protomers. In this conformation, the surface of the p12 domain, which is involved in caspase-2 activation by dimerization, is sterically occluded by the 14-3-3 dimer, thereby likely preventing caspase-2 activation. In addition, 14-3-3 protein binding to caspase-2 masks its NLS. Therefore, our results suggest that 14-3-3 protein binding to caspase-2 may play a key role in regulating caspase-2 activation. DATABASE: The atomic coordinates and structure factors have been deposited in the Protein Data Bank, www.ww pdb.org (PDB ID codes 6GKF and 6GKG).


    Organizational Affiliation

    Department of Structural Biology of Signaling Proteins, Division BIOCEV, Institute of Physiology of the Czech Academy of Sciences, Vestec, Czech Republic.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
14-3-3 protein gamma ABCDEFGH234Homo sapiensMutation(s): 0 
Gene Names: YWHAG
Find proteins for P61981 (Homo sapiens)
Explore P61981 
Go to UniProtKB:  P61981
NIH Common Fund Data Resources
PHAROS:  P61981
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Caspase-2 IJKLMN8Homo sapiensMutation(s): 0 
Gene Names: CASP2ICH1NEDD2
EC: 3.4.22.55
Find proteins for P42575 (Homo sapiens)
Explore P42575 
Go to UniProtKB:  P42575
NIH Common Fund Data Resources
PHAROS:  P42575
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
SEP
Query on SEP
I,J,K,L,M,NL-PEPTIDE LINKINGC3 H8 N O6 PSER
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.85 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.231 
  • R-Value Observed: 0.233 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 121.987α = 90
b = 121.987β = 90
c = 311.004γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
MOLREPphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Czech Science FoundationCzech Republic17-00726S

Revision History 

  • Version 1.0: 2018-10-17
    Type: Initial release
  • Version 1.1: 2018-11-28
    Changes: Data collection, Database references, Structure summary