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Analysis of β-Amyloid-induced Abnormalities on Fibrin Clot Structure by Spectroscopy and Scanning Electron Microscopy
Published on: November 30, 2018
Oxidation-induced modification of the fibrinogen polypeptide chains
A V Bychkova1, A D Vasilyeva2, A E Bugrova2
1Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Moscow, Russia. anna.v.bychkova@gmail.com.
Oxidation of fibrinogen affects its Aα, Bβ, and γ chains, with the αC-region being most vulnerable. These oxidative modifications inhibit protofibril aggregation, suggesting antioxidant roles for modified residues.
Area of Science:
- Biochemistry
- Proteomics
- Oxidative Stress
Background:
- Fibrinogen is a key protein in blood coagulation.
- Oxidative modifications can alter protein structure and function.
- Understanding fibrinogen oxidation is crucial for studying thrombosis and related diseases.
Purpose of the Study:
- To investigate the specific sites of oxidative modification on fibrinogen polypeptide chains (Aα, Bβ, γ).
- To determine the impact of oxidation on fibrinogen's self-assembly properties, particularly protofibril aggregation.
- To explore the potential antioxidant role of oxidized amino acid residues in fibrinogen.
Main Methods:
- Mass spectrometry was employed to identify and map oxidative modifications on fibrinogen.
- Analysis focused on the Aα, Bβ, and γ polypeptide chains of fibrinogen.
- Comparative analysis of oxidation susceptibility across different fibrinogen structural elements.
Main Results:
- The αC-region of the Aα chain is the most susceptible to oxidation (e.g., by ozone).
- Oxidative sites on the Bβ chain are distributed across its structural elements, with the β-nodule being highly susceptible.
- The γ chains are the least affected by oxidative modification.
- Oxidation does not involve the self-assembly centers (knob "A": hole "a").
- Numerous oxidative sites were identified, correlating with inhibited lateral aggregation of protofibrils.
Conclusions:
- Oxidative modification of fibrinogen primarily targets specific regions, notably the αC-region and parts of the Bβ chain.
- These modifications significantly inhibit the lateral aggregation of fibrinogen protofibrils.
- The identified oxidative sites may play a role in the antioxidant defense of fibrinogen.
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