Molecular basis of the specific subcellular localization of the C2-like domain of 5-lipoxygenase

Shilpa Kulkarni, Sudipto Das, Colin D. Funk, Diana Murray, Wonhwa Cho

Research output: Contribution to journalArticle

142 Scopus citations

Abstract

The activation of 5-lipoxygenase (5-LO) involves its calcium-dependent translocation to the nuclear envelope, where it catalyzes the two-step transformation of arachidonic acid into leukotriene A4, leading to the synthesis of various leukotrienes. To understand the mechanism by which 5-LO is specifically targeted to the nuclear envelope, we studied the membrane binding properties of the amino-terminal domain of 5-LO, which has been proposed to have a C2 domain-like structure. The model building, electrostatic potential calculation, and in vitro membrane binding studies of the isolated C2-like domain of 5-LO and selected mutants show that this Ca2+-dependent domain selectively binds zwitterionic phosphatidylcholine, which is conferred by tryptophan residues (Trp13, Trp75, and Trp102) located in the putative Ca2+-binding loops. The spatiotemporal dynamics of the enhanced green fluorescence protein-tagged C2-like domain of 5-LO and mutants in living cells also show that the phosphatidylcholine selectivity of the C2-like domain accounts for the specific targeting of 5-LO to the nuclear envelope. Together, these results show that the C2-like domain of 5-LO is a genuine Ca2+-dependent membrane-targeting domain and that the subcellular localization of the domain is governed in large part by its membrane binding properties.

Original languageEnglish (US)
Pages (from-to)13167-13174
Number of pages8
JournalJournal of Biological Chemistry
Volume277
Issue number15
DOIs
Publication statusPublished - Apr 12 2002

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ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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