A novel lipid hydroperoxide-derived cyclic covalent modification to histone H4 - PubMed (original) (raw)
. 2003 Oct 24;278(43):42098-105.
doi: 10.1074/jbc.M308167200. Epub 2003 Aug 20.
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- PMID: 12930824
- DOI: 10.1074/jbc.M308167200
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A novel lipid hydroperoxide-derived cyclic covalent modification to histone H4
Tomoyuki Oe et al. J Biol Chem. 2003.
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Abstract
Previous studies have established that 4-hydroxy-2-nonenal is a lipid hydroperoxide-derived aldehydic bifunctional electrophile that reacts with DNA and proteins. However, it has now been recognized that 4-oxo-2-nonenal is also a major product of lipid hydroperoxide decomposition. Furthermore, 4-oxo-2-nonenal is more reactive than 4-hydroxy-2-nonenal toward the DNA-bases 2'-deoxyguanosine, 2'-deoxyadenosine, and 2'-deoxycytidine and proteins. The formation of 4-oxo-2-nonenal can be induced through vitamin C-mediated or transition metal ion-mediated homolytic decomposition of polyunsaturated omega-3 lipid hydroperoxides such as 13(S)-hydroperoxyoctadecadienoic acid. We have discovered that synthetic 4-oxo-nonenal or 4-oxo-2-nonenal-generated from 13(S)-hydroperoxyoctadecadienoic acid recognizes the specific amino acid motifs of His75, Ala76, and Lys77 in bovine histone H4. Reaction of the histidine and lysine residues with 4-oxo-2-nonenal results in the formation of a novel cyclic structure within the protein. The cyclic structure incorporates the histidine imidazole ring and a newly formed pyrrole derived from the lysine. The cyclic imidazole-pyrrole derivative that is formed from the small Nalpha-acetyl-His-Ala-Lys peptide exists as a mixture of two atropisomers that inter-convert upon heating. Such lipid hydroperoxide-derived modifications could potentially modulate transcriptional activation in vivo. Furthermore, the ability to synthesize cyclic peptides using 4-oxo-2-nonenal will facilitate the preparation of novel structural analogs with potential biological activity.
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