Abstract
Previously we purified fibrinogenase from venom of Echis multisquamatis and showed that the enzyme predominantly cleaves BβArg42-Ala43 peptide bond of fibrinogen. A much slower hydrolysis of its Aα-chain was also shown. To evaluate the accessibility of the hydrolysis sites to fibrinogenase’s hydrolytic action, the pathway of cleavage of Aα- and Bβ-chains of fibrinogen, monomeric and polymeric fibrin desA and desAB has been investigated using western blot with monoclonal antibodies to Bβ 26–42 and Aα 20–78 of fibrinogen. The data indicated that the BβArg42-Ala43 peptide bond is available for cleavage in all forms of fibrin(ogen) with the exception of polymerized fibrin desAB. This is direct evidence of BβN-domain involvement in formation of protofibrils that makes it inaccessible to protease. The Aα-chain of fibrinogen remained intact after 3 min of incubation with fibrinogenase. Further incubation resulted in cleaving of the fibrin(ogen) αC-regions with the formation of two kinds of degradation products (~30 and ~60 kDa). In the case of monomeric fibrin desA or desAB we observed simultaneous hydrolysis of Aα and Bβ-chains and the cleavage of Aα-chain was more apparent for both forms of polymeric fibrin.
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Abbreviations
- tPA:
-
Tissue plasminogen activator
- SDS:
-
Sodium dodecyl sulphate
- PAGE:
-
Polyacrylamide gel electrophoresis
- TBS:
-
Tris-buffered saline
- PBS:
-
Phosphate-buffered saline
- HRP:
-
Horseradish peroxidase
- TEMED:
-
Tetramethylethylenediamine
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Acknowledgments
Author gratefully acknowledges Dr Lyuba Mikhalovska for her help with N-terminal analysis of polypeptides and Prof. Eduard Lugovskoy for helpful advice on the choice of specific antibodies.
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Chernyshenko, V.O. Limited Proteolysis of Fibrinogen by Fibrinogenase from Echis multisquamatis Venom. Protein J 34, 130–134 (2015). https://doi.org/10.1007/s10930-015-9605-2
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DOI: https://doi.org/10.1007/s10930-015-9605-2