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: 2.847 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.231 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

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:  

  • 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 ...

    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.,Institute of Physics, Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic.,Division BIOCEV, Institute of Microbiology of the Czech Academy of Sciences, Vestec, Czech Republic.,Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University, Prague, Czech Republic.,2nd Faculty of Medicine, Charles University, Prague, Czech Republic.,Department of Biochemistry, Faculty of Science, Charles University, Prague, Czech Republic.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
14-3-3 protein gamma
A, B, C, D, E, F, G, H
234Homo sapiensMutation(s): 0 
Gene Names: YWHAG
Find proteins for P61981 (Homo sapiens)
Go to Gene View: YWHAG
Go to UniProtKB:  P61981
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Caspase-2
I, J, K, L, M, N
8Homo sapiensMutation(s): 0 
Gene Names: CASP2 (ICH1, NEDD2)
EC: 3.4.22.55
Find proteins for P42575 (Homo sapiens)
Go to Gene View: CASP2
Go to UniProtKB:  P42575
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
SEP
Query on SEP
I, J, K, L, M, N
L-PEPTIDE LINKINGC3 H8 N O6 PSER
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.847 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.231 
  • Space Group: P 41 21 2
Unit Cell:
Length (Å)Angle (°)
a = 121.987α = 90.00
b = 121.987β = 90.00
c = 311.004γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
MOLREPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



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
    Type: Data collection, Database references, Structure summary