Highly potent bifunctional inhibitors of Factor VIIa (FVIIa) were generated by linking two distinct peptides, recently shown to bind to two discrete exosites on the FVIIa protease domain [Dennis, Eigenbrot, Skelton, Ultsch, Santell, Dwyer, O'Connell and Lazarus (2000) Nature (London) 404, 465–470; Dennis, Roberge, Quan and Lazarus (2001) Biochemistry 40, 9513–9521; Roberge, Santell, Dennis, Eigenbrot, Dwyer and Lazarus (2001) Biochemistry 40, 9522–9531]. Fusion peptides consisting of an N-terminal A-series peptide followed by flexible linkers, an E-series peptide, and the Z-domain of protein A were expressed in Escherichia coli and purified using IgG—Sepharose affinity chromatography. The fusion peptides were potent anticoagulants and had steep concentration dependence curves in tissue factor-dependent prothrombin time (PT) assays in comparison to the individual peptides or their noncovalent combination. This phenomenon was dependent on the length of the linker joining the A- and E-peptides. The fusion of the peptides increased the extent of inhibition of Factor X (FX) activation to 100% at saturating peptide concentrations, but did not improve the binding affinity for Factor VIIa (FVIIa) at the A- and E- binding sites or the IC50 for the inhibition of FX activation. Differences between the peptides in the PT fold prolongation in normal and FVII-deficient plasma, in conjunction with the inhibition of 125I-FVII activation, suggest that the enhanced effects of the fusion peptides involve the inhibition of FVII autoactivation.
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April 2002
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Research Article|
April 08 2002
Fusion of two distinct peptide exosite inhibitors of Factor VIIa
Martin ROBERGE;
Martin ROBERGE
∗Department of Protein Engineering, Genentech Inc., 1 DNA Way, South San Francisco, California 94080, U.S.A.
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Mark PEEK;
Mark PEEK
†Department of Physiology, Genentech Inc., 1 DNA Way, South San Francisco, California 94080, U.S.A.
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Daniel KIRCHHOFER;
Daniel KIRCHHOFER
†Department of Physiology, Genentech Inc., 1 DNA Way, South San Francisco, California 94080, U.S.A.
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Mark S. DENNIS;
Mark S. DENNIS
∗Department of Protein Engineering, Genentech Inc., 1 DNA Way, South San Francisco, California 94080, U.S.A.
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Robert A. LAZARUS
Robert A. LAZARUS
1
∗Department of Protein Engineering, Genentech Inc., 1 DNA Way, South San Francisco, California 94080, U.S.A.
1To whom correspondence should be addressed (e-mail lazarus.bob@gene.com).
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Publisher: Portland Press Ltd
Received:
September 04 2001
Revision Received:
December 19 2001
Accepted:
February 07 2002
Online ISSN: 1470-8728
Print ISSN: 0264-6021
The Biochemical Society, London ©2002
2002
Biochem J (2002) 363 (2): 387–393.
Article history
Received:
September 04 2001
Revision Received:
December 19 2001
Accepted:
February 07 2002
Citation
Martin ROBERGE, Mark PEEK, Daniel KIRCHHOFER, Mark S. DENNIS, Robert A. LAZARUS; Fusion of two distinct peptide exosite inhibitors of Factor VIIa. Biochem J 15 April 2002; 363 (2): 387–393. doi: https://doi.org/10.1042/bj3630387
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