How a Protein Cleaves Kininogen to Release Bradykinin
Author Information
Author(s): Dobó József, Major Balázs, Kékesi Katalin A., Szabó István, Megyeri Márton, Hajela Krishnan, Juhász Gábor, Závodszky Péter, Gál Péter
Primary Institution: Institute of Enzymology, Hungarian Academy of Sciences, Budapest, Hungary
Hypothesis
Activated MASPs can digest kininogen to release bradykinin.
Conclusion
MASP-1 can cleave high-molecular-weight kininogen to produce bradykinin, while MASP-2 can cleave kininogen but does not release bradykinin.
Supporting Evidence
- MASP-1 was shown to cleave high-molecular-weight kininogen resulting in bradykinin production.
- MASP-2 could cleave kininogen but did not release bradykinin.
- The catalytic efficiency of MASP-1 was significantly higher than that of MASP-2.
Takeaway
There are proteins in our blood that can cut up other proteins to make a substance called bradykinin, which can cause swelling. One of these proteins, called MASP-1, is really good at this job.
Methodology
The study used differential gel electrophoresis and HPLC to analyze the cleavage of kininogen by MASP-1 and MASP-2.
Limitations
The study did not explore the in vivo implications of MASP-1 activity on bradykinin levels in patients with hereditary angioedema.
Digital Object Identifier (DOI)
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