Quantitation of Protein Carbonylation by Dot Blot

Overview

Journal Anal Biochem

Publisher Elsevier

Specialty Biochemistry

Date 2012 Feb 14

PMID 22326366

Citations 18

Authors

Nancy B Wehr

Rodney L Levine

Affiliations

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Abstract

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.

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