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标题：Selective cleavage of thioether linkage in proteins modified with 4-hydroxynonenal.
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作者：K Uchida ; E R Stadtman
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：1992
卷号：89
期号：12
页码：5611-5615
DOI：10.1073/pnas.89.12.5611
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：The peroxidation of polyunsaturated fatty acids leads to numerous products, including 4-hydroxynonenal (HNE). That 4-hydroxy-2-alkenal compounds react with sulfhydryl groups of proteins to form thioether adducts possessing a carbonyl function has been established [Schauenstein, E. & Esterbauer, H. (1979) Ciba Found. Symp. 67, 225-244]. Taking advantage of the fact that Raney nickel catalyzes cleavage of thioether bonds, we have developed a procedure to quantitate the amount of HNE moiety bound to protein by means of a thioether linkage. Adducts of HNE with N-acetylcysteine and glutathione were prepared, labeled with NaB[3H]H4, and then treated with Raney nickel. The 3H-labeled product was recovered in 85-90% yield from both HNE-N-acetylcysteine and HNE-glutathione adducts in a solvent [10% (vol/vol) methanol/chloroform]-estractable form. Treatment of proteins with HNE led to the disappearance of protein sulfhydryl groups. However, less than 10% of the labeled adducts obtained after subsequent reduction with NaB[3H]H4 could be released in a solvent-extractable form upon treatment with Raney nickel. This and the observation that HNE reacts with proteins lacking a sulfhydryl group attests to the fact that HNE can react with amino acid residues other than cysteinyl residues.