Ovalbumin oxidative modification fingerprints depend on gas plasma-driven reactive species profiles.
This study maps over 80 oxidative modifications on ovalbumin, showing how different reactive species profiles influence these changes. It underscores the complexity of protein oxidation processes.
Where it sits
this study against the rest of the kpv corpusSummary and findings
The study investigated oxidative modifications of the chicken egg protein ovalbumin using gas plasma technology, which generates reactive species. High-resolution mass spectrometry identified over 80 distinct oxidative modifications at the amino acid level. Different gas plasma compositions resulted in specific oxidation profiles, highlighting the role of atomic oxygen and hydrogen peroxide.
Abstract
<h4>Objective</h4>Oxidative protein modifications have been linked to several diseases, but the variety and diversity of modifications are less studied.<h4>Methods</h4>We used the chicken egg protein ovalbumin and gas plasma technology, a potent source of various reactive species, for protein oxidation. Using high-resolution mass spectrometry and an in-house workflow, over 80 distinct oxidative protein modifications were mapped at per-amino-acid resolution. To examine how modification profiles depend on changes in reactive species types and concentrations, we generated 12 distinct argon gas plasmas by systematically varying molecular gas admixtures (water, ethanol, oxygen, and nitrogen).<h4>Results</h4>Optical emission spectroscopy (OES) and photometric determination of deposited long-lived species (hydrogen peroxide, nitrite, and nitrate) were applied to profile gas plasma conditions, revealing the admixture-dependent impact on the reactive oxygen/nitrogen species (ROS/RNS) fingerprint. Correlation analysis with mass spectrometry data revealed the significant involvement of atomic oxygen and hydrogen peroxide in protein oxidation. The enrichment of specific reactive species created by a defined gas plasma composition generated specific ovalbumin oxidation profiles resolved per amino acid. Feed gas-dependent oxidation hotspots, such as Trp149 for dry argon gas or Met274 for hydroxyl radical-rich humidified argon gas, were identified.<h4>Discussion</h4>This first-of-its-kind study reveals intricate relationships between dynamic reactive species environments and protein oxidation profiles using ovalbumin as a model system.
Background
This study addresses the question of how oxidative protein modifications, which are linked to various diseases, are influenced by different reactive species. While the diversity of these modifications is less studied, understanding them is crucial for elucidating disease mechanisms. The research uses ovalbumin as a model protein to explore these modifications under different reactive species conditions generated by gas plasma technology.
Methods
The study employed high-resolution mass spectrometry to map oxidative modifications on ovalbumin at the amino acid level. Gas plasma technology was used to generate reactive species, with 12 distinct argon gas plasmas created by varying molecular gas admixtures such as water, ethanol, oxygen, and nitrogen. Optical emission spectroscopy and photometric determination were used to profile gas plasma conditions and correlate them with mass spectrometry data.
Results
The study identified over 80 distinct oxidative modifications on ovalbumin, with specific profiles depending on the reactive species generated by different gas plasma compositions. Atomic oxygen and hydrogen peroxide were significantly involved in protein oxidation. Specific oxidation hotspots were identified, such as Trp149 for dry argon gas and Met274 for hydroxyl radical-rich humidified argon gas.
Interpretation
The findings demonstrate the intricate relationship between reactive species environments and protein oxidation profiles, providing insights into how specific reactive species contribute to oxidative modifications. While the study offers valuable mechanistic insights, the clinical significance remains uncertain due to the in vitro nature of the research. The results highlight the potential for tailoring reactive species environments to study specific oxidative modifications.
Key findings
- Over 80 distinct oxidative protein modifications mapped.
- 12 distinct argon gas plasmas generated by varying molecular gas admixtures.
- Significant involvement of atomic oxygen and hydrogen peroxide in protein oxidation.
- Feed gas-dependent oxidation hotspots identified, such as Trp149 and Met274.
Limitations
- In vitro model using ovalbumin, not representative of human proteins.
- Findings based on specific gas plasma conditions, limiting generalizability.
- No direct clinical relevance due to model system.