4ZVO

Caspase-7 Variant 4 (V4) with reprogrammed substrate specificity due to Y230V/W232Y/S234V/Q276D substitutions bound to VEID inhibitor.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.85 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.209 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Reprogramming Caspase-7 Specificity by Regio-Specific Mutations and Selection Provides Alternate Solutions for Substrate Recognition.

Hill, M.E.MacPherson, D.J.Wu, P.Julien, O.Wells, J.A.Hardy, J.A.

(2016) Acs Chem.Biol. 11: 1603-1612

  • DOI: 10.1021/acschembio.5b00971
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The ability to routinely engineer protease specificity can allow us to better understand and modulate their biology for expanded therapeutic and industrial applications. Here, we report a new approach based on a caged green fluorescent protein (CA-GF ...

    The ability to routinely engineer protease specificity can allow us to better understand and modulate their biology for expanded therapeutic and industrial applications. Here, we report a new approach based on a caged green fluorescent protein (CA-GFP) reporter that allows for flow-cytometry-based selection in bacteria or other cell types enabling selection of intracellular protease specificity, regardless of the compositional complexity of the protease. Here, we apply this approach to introduce the specificity of caspase-6 into caspase-7, an intracellular cysteine protease important in cellular remodeling and cell death. We found that substitution of substrate-contacting residues from caspase-6 into caspase-7 was ineffective, yielding an inactive enzyme, whereas saturation mutagenesis at these positions and selection by directed evolution produced active caspases. The process produced a number of nonobvious mutations that enabled conversion of the caspase-7 specificity to match caspase-6. The structures of the evolved-specificity caspase-7 (esCasp-7) revealed alternate binding modes for the substrate, including reorganization of an active site loop. Profiling the entire human proteome of esCasp-7 by N-terminomics demonstrated that the global specificity toward natural protein substrates is remarkably similar to that of caspase-6. Because the esCasp-7 maintained the core of caspase-7, we were able to identify a caspase-6 substrate, lamin C, that we predict relies on an exosite for substrate recognition. These reprogrammed proteases may be the first tool built with the express intent of distinguishing exosite dependent or independent substrates. This approach to specificity reprogramming should also be generalizable across a wide range of proteases.


    Organizational Affiliation

    Department of Chemistry, 104 LGRT, 710 N. Pleasant St., University of Massachusetts , Amherst, Massachusetts 01003, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Caspase-7
A, C
198Homo sapiensMutation(s): 0 
Gene Names: CASP7 (MCH3)
EC: 3.4.22.60
Find proteins for P55210 (Homo sapiens)
Go to Gene View: CASP7
Go to UniProtKB:  P55210
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Caspase-7
B, D
113Homo sapiensMutation(s): 4 
Gene Names: CASP7 (MCH3)
EC: 3.4.22.60
Find proteins for P55210 (Homo sapiens)
Go to Gene View: CASP7
Go to UniProtKB:  P55210
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Peptide ACE-VAL-GLU-ILE-ASJ
E, F
5N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Biologically Interesting Molecules 1 Unique
IDChainsNameType/Class2D Diagram3D Interactions
PRD_000929
Query on PRD_000929
E,FN-acetyl-L-valyl-L-alpha-glutamyl-N-[(2S)-1-carboxy-3-hydroxypropan-2-yl]-L-isoleucinamidePeptide-like / Inhibitor

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.85 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.209 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 88.268α = 90.00
b = 88.268β = 90.00
c = 187.278γ = 120.00
Software Package:
Software NamePurpose
PHENIXrefinement
iMOSFLMdata reduction
PHASERphasing
SCALAdata scaling
PDB_EXTRACTdata extraction
REFMACrefinement
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical SciencesUnited StatesR01GM080532

Revision History 

  • Version 1.0: 2016-04-20
    Type: Initial release
  • Version 1.1: 2016-05-25
    Type: Structure summary
  • Version 1.2: 2016-07-06
    Type: Database references
  • Version 1.3: 2017-09-20
    Type: Author supporting evidence, Derived calculations, Refinement description