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Updated: Dec 31, 2025
07:16
Resin-Assisted Capture Coupled with Isobaric Tandem Mass Tag Labeling for Multiplexed Quantification of Protein Thiol Oxidation
Published on: June 21, 2021
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Substrate specificity of thioredoxins and glutaredoxins - towards a functional classification
Manuela Gellert1, Md Faruq Hossain1, Felix Jacob Ferdinand Berens1,2
1Institute for Medical Biochemistry and Molecular Biology, University Medicine Greifswald, Germany.
Heliyon
|January 1, 2020
Summary
Protein thiol redox reactions are key in cell signaling. This study reveals electrostatic properties, not sequence or structure, dictate target specificity for thioredoxin-like proteins, impacting redox signaling pathways.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Signaling
Background:
- Protein thiol oxidation and reduction are crucial for cellular signal transduction across all life forms.
- Thioredoxin (Trx) proteins are central to catalyzing thiol-disulfide exchange reactions, functioning as key regulators of thiol switches.
- Despite extensive research, the precise determinants of Trx family protein substrate specificity remain incompletely understood.
Purpose of the Study:
- To comprehensively compare redoxins from all domains of life.
- To investigate the correlation between protein similarity (sequence, structure, electrostatics) and substrate specificity.
- To identify the primary drivers of target recognition in thiol-disulfide oxidoreductases.
Main Methods:
- Comparative analysis of redoxins based on amino acid sequence.
- Tertiary structure comparison of redoxins.
- Analysis of electrostatic properties of redoxins.
- Correlation of protein similarities with known and predicted interaction partners.
Main Results:
- Classification and clustering of redoxins based on sequence and tertiary structure do not align with their substrate specificity.
- Electrostatic properties demonstrate a strong correlation with target specificity.
- This electrostatic similarity dictates specificity independently of Trx or glutaredoxin subfamily classification.
Conclusions:
- Substrate specificity in thiol-disulfide oxidoreductases is primarily governed by electrostatic interactions, not sequence or structural homology.
- Existing classification systems based on sequence and structure do not fully explain functional specificity.
- Understanding electrostatic complementarity is vital for predicting and understanding redoxin-substrate interactions in cellular signaling.
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