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• W2010323214 endingPage "8387" @default.
• W2010323214 startingPage "8383" @default.
• W2010323214 abstract "Leukotriene A4 (LTA4) hydrolase [7E,9E,11Z,14Z)-(5S,6S)-5,6-epoxyicosa-7,9 ,11,14-tetraenoate hydrolase; EC 3.3.2.6] is a bifunctional zinc metalloenzyme which converts LTA4 into the chemotactic agent leukotriene B4 (LTB4). Suicide inactivation, a typical feature of LTA4 hydrolase/aminopeptidase, occurs via an irreversible, apparently mechanism-based, covalent binding of LTA4 to the protein in a 1:1 stoichiometry. Differential lysine-specific peptide mapping of unmodified and suicide-inactivated LTA4 hydrolase has been used to identify a henicosapeptide, encompassing the amino acid residues 365-385 of human LTA4 hydrolase, which is involved in the binding of LTA4, LTA4 methyl ester, and LTA4 ethyl ester to the native enzyme. A modified form of this peptide, generated by lysine-specific digestion of LTA4 hydrolase inactivated by LTA4 ethyl ester, could be isolated for complete Edman degradation. The sequence analysis revealed a gap at position 14, which shows that binding of the leukotriene epoxide had occurred via Tyr-378 in LTA4 hydrolase. Inactivation of the epoxide hydrolase and the aminopeptidase activity was accompanied by a proportionate modification of the peptide. Furthermore, both enzyme inactivation and peptide modification could be prevented by preincubation of LTA4 hydrolase with the competitive inhibitor bestatin, which demonstrates that the henicosapeptide contains functional elements of the active site(s). It may now be possible to clarify the molecular mechanisms underlying suicide inactivation and epoxide hydrolysis by site-directed mutagenesis combined with structural analysis of the lipid molecule, covalently bound to the peptide." @default.
• W2010323214 created "2016-06-24" @default.
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• W2010323214 date "1995-08-29" @default.
• W2010323214 modified "2023-10-03" @default.
• W2010323214 title "Leukotriene A4 hydrolase: mapping of a henicosapeptide involved in mechanism-based inactivation." @default.
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• W2010323214 doi "https://doi.org/10.1073/pnas.92.18.8383" @default.
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