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Widespread, Reversible Cysteine Modification by Methylglyoxal Regulates Metabolic Enzyme Function
John S Coukos1, Chris W Lee1, Kavya S Pillai1
1Department of Chemistry, The University of Chicago, 929 E. 57th Street, Chicago, Illinois 60637, United States.
ACS Chemical Biology
|December 23, 2022
Summary
Methylglyoxal (MGO), a glucose metabolism byproduct, modifies proteins at cysteine residues. This study maps these modifications, revealing potential regulatory roles in cellular metabolism and responses to nutrient changes.
Area of Science:
- Biochemistry
- Proteomics
- Metabolomics
Background:
- Methylglyoxal (MGO) is a reactive metabolite from glucose metabolism.
- MGO forms posttranslational modifications (PTMs) on nucleophilic amino acids, particularly cysteine.
- These modifications can serve as rapid cellular sensors for metabolic flux.
Purpose of the Study:
- To map the proteome-wide landscape of MGO modification on cysteine residues.
- To identify potential sites of functional regulation by MGO.
- To characterize the impact of MGO modification on metabolic enzymes and cellular metabolism.
Main Methods:
- Quantitative LC-MS/MS-based chemoproteomic profiling.
- Utilized a cysteine-reactive probe to capture MGO-modified sites.
- Investigated MGO modification in a key metabolic enzyme.
Main Results:
- Identified a wide range of cysteine residues modified by MGO across the proteome.
- Discovered numerous sites potentially regulated by MGO.
- Characterized the functional consequences of MGO modification on a metabolic enzyme's catalytic activity and cellular metabolism.
Conclusions:
- MGO-cysteine modifications represent a significant layer of proteome regulation.
- These modifications offer a mechanism for cells to dynamically respond to metabolic shifts.
- Understanding MGO PTMs is crucial for deciphering cellular metabolic control and disease states.
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