4OGX

Crystal structure of Fab DX-2930 in complex with human plasma kallikrein at 2.4 Angstrom resolution

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.188 

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This is version 1.1 of the entry. See complete history. 


Literature

Inhibition of plasma kallikrein by a highly specific active site blocking antibody.

Kenniston, J.A., Faucette, R.R., Martik, D., Comeau, S.R., Lindberg, A.P., Kopacz, K.J., Conley, G.P., Chen, J., Viswanathan, M., Kastrapeli, N., Cosic, J., Mason, S., DiLeo, M., Abendroth, J., Kuzmic, P., Ladner, R.C., Edwards, T.E., TenHoor, C., Adelman, B.A., Nixon, A.E., Sexton, D.J.

(2014) J Biol Chem 289: 23596-23608

  • DOI: 10.1074/jbc.M114.569061
  • Primary Citation of Related Structures:  
    4OGX, 4OGY, 4PUB

  • PubMed Abstract: 

    • Plasma kallikrein (pKal) proteolytically cleaves high molecular weight kininogen to generate the potent vasodilator and the pro-inflammatory peptide, bradykinin. pKal activity is tightly regulated in healthy individuals by the serpin C1-inhibitor, but individuals with hereditary angioedema (HAE) are deficient in C1-inhibitor and consequently exhibit excessive bradykinin generation that in turn causes debilitating and potentially fatal swelling attacks ...

    Plasma kallikrein (pKal) proteolytically cleaves high molecular weight kininogen to generate the potent vasodilator and the pro-inflammatory peptide, bradykinin. pKal activity is tightly regulated in healthy individuals by the serpin C1-inhibitor, but individuals with hereditary angioedema (HAE) are deficient in C1-inhibitor and consequently exhibit excessive bradykinin generation that in turn causes debilitating and potentially fatal swelling attacks. To develop a potential therapeutic agent for HAE and other pKal-mediated disorders, we used phage display to discover a fully human IgG1 monoclonal antibody (DX-2930) against pKal. In vitro experiments demonstrated that DX-2930 potently inhibits active pKal (Ki = 0.120 ± 0.005 nM) but does not target either the zymogen (prekallikrein) or any other serine protease tested. These findings are supported by a 2.1-Å resolution crystal structure of pKal complexed to a DX-2930 Fab construct, which establishes that the pKal active site is fully occluded by the antibody. DX-2930 injected subcutaneously into cynomolgus monkeys exhibited a long half-life (t½ ∼ 12.5 days) and blocked high molecular weight kininogen proteolysis in activated plasma in a dose- and time-dependent manner. Furthermore, subcutaneous DX-2930 reduced carrageenan-induced paw edema in rats. A potent and long acting inhibitor of pKal activity could be an effective treatment option for pKal-mediated diseases, such as HAE.

    Organizational Affiliation: 

    From the Dyax Corp., Burlington, Massachusetts 01803, dsexton@dyax.com.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Plasma kallikreinA241Homo sapiensMutation(s): 4 
Gene Names: KLK3, KLKB1, KLKB1_HUMAN
EC: 3.4.21.34
UniProt & NIH Common Fund Data Resources
Find proteins for P03952 (Homo sapiens)
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Go to UniProtKB:  P03952
PHAROS:  P03952
GTEx:  ENSG00000164344 
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UniProt GroupP03952
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
DX-2930 HEAVY CHAINB [auth H]225Homo sapiensMutation(s): 0 
UniProt
Find proteins for S6C4R2 (Homo sapiens)
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UniProt GroupS6C4R2
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
DX-2930 LIGHT CHAINC [auth L]213Homo sapiensMutation(s): 0 
UniProt
Find proteins for Q7Z3Y4 (Homo sapiens)
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UniProt GroupQ7Z3Y4
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Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.188 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 109.61α = 90
b = 171.5β = 90
c = 42.32γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
PHASERphasing
REFMACrefinement
PDB_EXTRACTdata extraction
StructureStudiodata collection
XDSdata reduction

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-07-09
    Type: Initial release
  • Version 1.1: 2014-09-10
    Changes: Database references