title: Two dimensional blue native/SDS-PAGE to identify mitochondrial complex I subunits modified by 4-hydroxynonenal (HNE).
abstract: The lipid peroxidation product 4-hydroxynonenal (HNE) can form protein-linked HNE adducts, thereby impacting protein structure and function. Mitochondrial complex I (NADH-ubiquinone oxidoreductase), containing at least 45 subunits in mammalian cells, sits in a lipid-rich environment and is thus very susceptible to HNE modifications. In this paper, a procedure for the identification of HNE-modified complex I subunits is described. Complex I was isolated by first dimensional non-gradient blue native polyacrylamide gel electrophoresis (BN-PAGE). The isolated complex I band, visualized by either Coomassie blue staining or silver staining, was further analyzed by second dimensional sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE). HNE-modified proteins were visualized by Western blotting probed with anti-HNE antibodies. HNE-positive bands were then excised and the proteins contained in them were identified by mass spectrometric peptide sequencing. The method was successfully applied for the identification of two complex I subunits that showed enhanced HNE-modifications in diabetic kidney mitochondria.
authors: Department of Pharmaceutical Sciences, UNT System College of Pharmacy, University of North Texas Health Science Center Fort Worth, TX, USA.
authors: Jinzi
authors: J
authors: Wu
authors: Department of Pharmaceutical Sciences, UNT System College of Pharmacy, University of North Texas Health Science Center Fort Worth, TX, USA ; Department of Biochemistry and Molecular Biology, Gannan Medical University Ganzhou, China.
authors: Xiaoting
authors: X
authors: Luo
authors: Department of Pharmaceutical Sciences, UNT System College of Pharmacy, University of North Texas Health Science Center Fort Worth, TX, USA.
authors: Liang-Jun
authors: LJ
authors: Yan
keywords: 4-hydroxynonenal; blue native/SDS-PAGE; diabetes; mitochondria; reactive oxygen species; streptozotocin