Glycome Atlas
molecule
Also known as MGO, MG, pyruvaldehyde
Plain-language answer
Methylglyoxal is a small, highly reactive molecule the body makes as a byproduct of breaking down sugar for energy. It carries two reactive carbon centers, which makes it much more aggressive at sticking to proteins than glucose is. Cells have a dedicated cleanup system to keep its levels in check.12
Because methylglyoxal reacts so readily with proteins, it is one of the main drivers of advanced glycation end product formation. When blood sugar runs high or the cleanup system is overwhelmed, methylglyoxal builds up and speeds the sugar damage linked to diabetic complications and aging.1
Technical detail
Methylglyoxal is a reactive alpha-dicarbonyl formed chiefly by non-enzymatic degradation of triose phosphate intermediates of glycolysis; it modifies arginine and lysine residues far faster than glucose and is a principal precursor of advanced glycation end products, being detoxified predominantly by the glyoxalase system.1
Methylglyoxal arises largely from spontaneous phosphate elimination from the triose phosphate intermediates dihydroxyacetone phosphate and glyceraldehyde-3-phosphate during glycolysis, with smaller contributions from lipid and amino acid metabolism. Its two adjacent carbonyl groups make it strongly electrophilic, so it reacts preferentially with arginine residues to form hydroimidazolone adducts, driving advanced glycation end product formation more efficiently than glucose.1
The glyoxalase system, comprising glyoxalase 1 and glyoxalase 2 with glutathione as cofactor, converts methylglyoxal to D-lactate and is the main route limiting its accumulation. When glycolytic flux is high or glyoxalase capacity is exceeded, methylglyoxal concentrations rise and increase dicarbonyl-derived protein modification.1
Human relevance
Elevated methylglyoxal, a state termed dicarbonyl stress, accelerates advanced glycation end product formation and is mechanistically implicated in the tissue damage of chronic hyperglycemia.1
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References