Quantitation of protein carbonylation by dot blot.
Protein carbonylation is the most commonly used measure of oxidative modification of proteins. It is frequently measured spectrophotometrically or immunochemically by derivatizing proteins with the classical carbonyl reagent, 2,4-dinitrophenylhydrazine. We developed an immunochemical dot blot method for quantitation of protein carbonylation in homogenates or purified proteins. Dimethyl sulfoxide was employed as the solvent because it very efficiently extracts proteins from tissues and keeps them soluble. It also readily dissolves 2,4-dinitrophenylhydrazine and wets polyvinylidene difluoride (PVDF) membranes. The detection limit is 0.19 ± 0.04 pmol of carbonyl, and 60 ng of protein is sufficient to measure protein carbonyl content. This level of sensitivity allowed measurement of protein carbonylation in individual Drosophila.
Laboratory of Biochemistry, National Heart, Lung, and Blood Institute, Bethesda, MD 20892, USA.
Nancy B
NB
Wehr
Rodney L
RL
Levine
D000818:Animals; D004330:Drosophila / Q000378:metabolism; D006834:Hydrazines / Q000737:chemistry; D015151:Immunoblotting; D008567:Membranes, Artificial; D011145:Polyvinyls / Q000737:chemistry; D040081:Protein Array Analysis; D050050:Protein Carbonylation; D011506:Proteins / Q000032:analysis* / Q000276:immunology; D013454:Sulfoxides / Q000737:chemistry; D005465:Fluorocarbon Polymers
D006834:Hydrazines; D008567:Membranes, Artificial; D011145:Polyvinyls; D011506:Proteins; D013454:Sulfoxides; C446799:dinitrophenylhydrazine; C454662:diethyl sulfoxide; C024865:polyvinylidene fluoride; D005465:Fluorocarbon Polymers