How MASP2 Activates Prothrombin in the Immune System
Author Information
Author(s): Krarup Anders, Wallis Russell, Presanis Julia S., Gál Péter, Sim Robert B.
Primary Institution: MRC Immunochemistry Unit, Department of Biochemistry, University of Oxford, Oxford, United Kingdom
Hypothesis
Can MASP2 activate prothrombin in a manner similar to factor Xa?
Conclusion
MASP2 can activate prothrombin, generating thrombin that plays a role in the innate immune response.
Supporting Evidence
- MASP2 can cleave prothrombin, generating active thrombin.
- Thrombin generated by MASP2 can cleave fibrinogen and factor XIII.
- Fibrinogen turnover was observed when prothrombin was activated by MASP2.
- MBL/MASP2 complexes can bind to bacterial surfaces and promote fibrin deposition.
Takeaway
This study shows that a protein called MASP2 can help make another protein, prothrombin, turn into thrombin, which is important for our immune system.
Methodology
The study involved incubating prothrombin with MASP2 and measuring thrombin activity through substrate turnover and fibrinogen cleavage.
Limitations
The thrombin activation potential of MASP2 is low compared to the prothrombinase complex, which may limit its physiological relevance.
Digital Object Identifier (DOI)
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