Leukotriene A4 hydrolase: A critical role of glutamic acid-296 for the binding of bestatin

M. Andberg, A. Wetterholm, J.F. Medina, J.Z. Haeggström

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Leukotriene A4 hydrolase is a bifunctional Zn2+-containing enzyme catalysing the formation of the potent chemotaxin leukotriene B4. From an analysis of three mutants of Glu-296 we have found that this catalytic residue is critical for the binding of bestatin, a classical aminopeptidase inhibitor. For bestatin, but not for three other tight-binding inhibitors, the IC50 values for inhibition of the epoxide hydrolase activity decreased in the mutants to 0.7-0.003% of the control. Hence Glu-296 is an important structural determinant for binding of bestatin to leukotriene A4 hydrolase; this conclusion might also apply to other members of the M1 family of metallopeptidases.
Original languageEnglish
Pages (from-to)621-625
JournalBiochemical Journal
Issue number3
Publication statusPublished - 2000
MoE publication typeA1 Journal article-refereed


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