Abstract
The interaction of a single-chain variable fragment (scFv) directed against human tissue factor (TF) was predicted using an in silico approach with the aim to establish a most likely mechanism of inhibition. The structure of the TF inhibiting scFv (TFI-scFv) was predicted using homology modeling, and complementarity-determining regions (CDRs) were identified. The CDR was utilized to direct molecular docking between the homology model of TFI-scFv and the crystal structure of the extracellular domains of human tissue factor. The rigid-body docking model was refined by means of molecular dynamic (MD) simulations, and the most prevalent cluster was identified. MD simulations predicted improved interaction between TFI-scFv and TF and propose the formation of stable complex for duration of the 600-ns simulation. Analysis of the refined docking model suggests that the interactions between TFI-scFv would interfere with the allosterical activation of coagulation factor VII (FVII) by TF. This interaction would prevent the formation of the active TF:VIIa complex and in so doing inhibit the initiation phase of blood coagulation as observers during in vitro testing.
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03 May 2020
One of the co-author’s details (Leon du Preez-lategaan) was printed incorrectly in the above publication. The correct details are provided below.
Abbreviations
- CDR:
-
Complementarity-determining regions
- NPT:
-
Constant number, volume, and pressure
- NVT:
-
Constant number, volume, and temperature
- dsFv:
-
Disulfide-stabilized variable fragments
- E. coli :
-
Escherichia coli
- FVII:
-
Factor VII
- FX:
-
Factor X
- Hv:
-
Heavy chain variable domains
- IgG:
-
Immunoglobulin
- Lv:
-
Light chain variable domains
- PME:
-
Particle mesh Ewald
- PBC:
-
Periodic boundary conditions
- pFv:
-
Permutated variable fragments
- ps:
-
Pico seconds
- PSSM:
-
Position-specific scoring matrix
- PDB:
-
Protein data bank
- scFv:
-
Single-chain variable fragment
- TF:
-
Tissue factor
- TF:FVIIa:
-
Tissue factor: factor VIIa complex
- TFI-scFv:
-
Tissue factor inhibitor scFv
- VMD:
-
Visual molecular dynamics
- YASARA:
-
Yet another scientific artificial reality application
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Acknowledgments
I would like to thank the Department of Haematology and Cell Biology; Department of Virology of the Faculty of Health Sciences; and the Department of Microbial, Biochemical and Food Biotechnology, Faculty of Agricultural Sciences at the University of the Free State as well as High-Performance Computing Cluster at the University of the Free State and the National Health Laboratory Service for their assistance throughout the project.
Funding
This work was funded by the Technology Innovation Agency of South Africa.
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Dr. J Vermeulen: principle researcher and main author
Mr. LL du Preez: experimental design and molecular dynamic analysis
Prof SM Meiring: study leader, experimental design and manuscript editing
Prof. FJ Burt: co-study leader, manuscript editing and infrastructure support
Prof. E van Heerden: co-study leader, experimental design and infrastructure support
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The original version of this article was revised: One of the co-author’s details (Leon du Preez-lategaan) was printed incorrectly in the above publication. Leon du Preez-lategaan should be Louis Lategan du Preez.
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Vermeulen, JG., Burt, F., van Heerden, E. et al. Characterization of the inhibition mechanism of a tissuefactor inhibiting single-chain variable fragment: a combined computational approach. J Mol Model 26, 87 (2020). https://doi.org/10.1007/s00894-020-4350-7
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DOI: https://doi.org/10.1007/s00894-020-4350-7