4DCP

Crystal Structure of caspase 3, L168F mutant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.199 

wwPDB Validation   3D Report Full Report



Literature

Molecular insight into the role of the leucine residue on the L2 loop in the catalytic activity of caspases 3 and 7

Kang, H.J.Lee, Y.M.Jeong, M.S.Kim, M.Bae, K.H.Kim, S.J.Chung, S.J.

(2012) Biosci Rep 32: 305-313

  • DOI: 10.1042/BSR20120009
  • Primary Citation of Related Structures:  
    4DCO, 4DCP, 4DCJ

  • PubMed Abstract: 
  • Various apoptotic signals can activate caspases 3 and 7 by triggering the L2 loop cleavage of their proenzymes. These two enzymes have highly similar structures and functions, and serve as apoptotic executioners. The structures of caspase 7 and procaspas ...

    Various apoptotic signals can activate caspases 3 and 7 by triggering the L2 loop cleavage of their proenzymes. These two enzymes have highly similar structures and functions, and serve as apoptotic executioners. The structures of caspase 7 and procaspase 7 differ significantly in the conformation of the loops constituting the active site, indicating that the enzyme undergoes a large structural change during activation. To define the role of the leucine residue on the L2 loop, which shows the largest movement during enzyme activation but has not yet been studied, Leu168 of caspase 3 and Leu191 of caspase 7 were mutated. Kinetic analysis indicated that the mutation of the leucine residues sometimes improved the Km but also greatly decreased the kcat, resulting in an overall decrease in enzyme activity. The tryptophan fluorescence change at excitation/emission = 280/350 nm upon L2-L2' loop cleavage was found to be higher in catalytically active mutants, including the corresponding wild-type caspase, than in the inactive mutants. The crystal structures of the caspase 3 mutants were solved and compared with that of wild-type. Significant alterations in the conformations of the L1 and L4 loops were found. These results indicate that the leucine residue on the L2 loop has an important role in maintaining the catalytic activity of caspases 3 and 7.


    Organizational Affiliation

    BioNanotechnology Research Center, KRIBB, Yuseong, Daejeon, 305-806, Korea.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Caspase-3 subunit p17 AD147Homo sapiensMutation(s): 1 
Gene Names: CASP3CPP32
EC: 3.4.22.56
Find proteins for P42574 (Homo sapiens)
Explore P42574 
Go to UniProtKB:  P42574
NIH Common Fund Data Resources
PHAROS:  P42574
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Caspase-3 subunit p12 BE108Homo sapiensMutation(s): 0 
Gene Names: CASP3CPP32
EC: 3.4.22.56
Find proteins for P42574 (Homo sapiens)
Explore P42574 
Go to UniProtKB:  P42574
NIH Common Fund Data Resources
PHAROS:  P42574
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Caspase Inhibitor AC-DEVD-CHO CF5N/AMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Biologically Interesting Molecules (External Reference) 1 Unique
Entity ID: 3
IDChainsNameType/Class2D Diagram3D Interactions
PRD_000422
Query on PRD_000422
C, FAc-Asp-Glu-Val-Asp-AldehydePeptide-like /  Inhibitor

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.199 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.182α = 90
b = 68.245β = 101.84
c = 94.048γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
PHASERphasing
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-12-12
    Type: Initial release