Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Hetero 6-mer - A2B2C2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 100.94 kDa 
• Atom Count: 6245 
• Residue Count: 777 
• Unique protein chains: 3

4LSZ

Caspase-7 in Complex with DARPin D7.18

• DOI: 10.2210/pdb4LSZ/pdb

• Classification: HYDROLASE
• Organism(s): Homo sapiens, synthetic construct
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2013-07-23 Released: 2014-07-02 
• Deposition Author(s): Fluetsch, A., Lukarska, M., Gruetter, M.G.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.26 Å
• R-Value Free: 0.208 
• R-Value Work: 0.175 
• R-Value Observed: 0.176 

Literature

Combined inhibition of caspase 3 and caspase 7 by two highly selective DARPins slows down cellular demise.

Flutsch, A., Ackermann, R., Schroeder, T., Lukarska, M., Hausammann, G.J., Weinert, C., Briand, C., Grutter, M.G.

(2014) Biochem J 461: 279-290

• PubMed: 24779913 
• DOI: 10.1042/BJ20131456
• Primary Citation of Related Structures:  
  4LSZ


• PubMed Abstract: 
  

Caspases play important roles during apoptosis, inflammation and proliferation. The high homology among family members makes selective targeting of individual caspases difficult, which is necessary to precisely define the role of these enzymes. We have selected caspase-7-specific binders from a library of DARPins (designed ankyrin repeat proteins). The DARPins D7.18 and D7.43 bind specifically to procaspase 7 and active caspase 7, but not to other members of the family. Binding of the DARPins does not affect the active enzyme, but interferes with its activation by other caspases. The crystal structure of the caspase 7-D7.18 complex elucidates the high selectivity and the mode of inhibition. Combining these caspase-7-specific DARPins with the previously reported caspase-3-inhibitory DARPin D3.4S76R reduces the activity of caspase 3 and 7 in double-transfected HeLa cells during apoptosis. In addition, these cells showed less susceptibility to TRAIL (tumour-necrosis-factor-related apoptosis-inducing ligand)-induced apoptosis in living cell experiments. D7.18 and D7.43 are therefore novel tools for in vitro studies on procaspase 7 activation as well as for clarifying the role of its activation in different cellular processes. If applied in combination with D3.4S76R, they represent an excellent instrument to increase our understanding of these enzymes during various cellular processes.

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Organizational Affiliation: 

*Department of Biochemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Caspase-7 subunit p20	A, C	175	Homo sapiens	Mutation(s): 0  Gene Names: CASP7, MCH3 EC: 3.4.22.60
Find proteins for P55210 (Homo sapiens) Explore P55210  Go to UniProtKB:  P55210
NIH Common Fund Data Resources
PHAROS:  P55210 GTEx:  ENSG00000165806

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Caspase-7 subunit p10	B, D	105	Homo sapiens	Mutation(s): 0  Gene Names: CASP7, MCH3 EC: 3.4.22.60
Find proteins for P55210 (Homo sapiens) Explore P55210  Go to UniProtKB:  P55210
NIH Common Fund Data Resources
PHAROS:  P55210 GTEx:  ENSG00000165806

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
DARPin D7.18	E, F	169	synthetic construct	Mutation(s): 0

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.26 Å
• R-Value Free: 0.208 
• R-Value Work: 0.175 
• R-Value Observed: 0.176 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 59.84	α = 90
b = 82.31	β = 91.86
c = 95.08	γ = 90

Software Package:

Software Name	Purpose
PHASER	phasing
PHENIX	refinement
XDS	data reduction
XSCALE	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2013-07-23 
• Released Date: 2014-07-02 
Deposition Author(s): Fluetsch, A., Lukarska, M., Gruetter, M.G.

Revision History 

• Version 1.0: 2014-07-02
  Type: Initial release
  
• Version 1.1: 2014-07-09
  Changes: Database references
• Version 1.2: 2017-11-15
  Changes: Refinement description