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© The Rockefeller University Press, 0021-9525/1999//1219 $5.00
The Journal of Cell Biology, Volume 145, Number 6, , 1999 1219-1232

Role of Phosphorylation Sites and the C2 Domain in Regulation of Cytosolic Phospholipase A₂

Division of Basic Science, Department of Pediatrics, National Jewish Medical and Research Center, Denver, Colorado 80206; and Department of Pathology, University of Colorado School of Medicine, Denver, Colorado 80262

Cytosolic phospholipase A₂ (cPLA₂) mediates agonist-induced arachidonic acid release, the first step in eicosanoid production. cPLA₂ is regulated by phosphorylation and by calcium, which binds to a C2 domain and induces its translocation to membrane. The functional roles of phosphorylation sites and the C2 domain of cPLA₂ were investigated. In Sf9 insect cells expressing cPLA₂, okadaic acid, and the calcium-mobilizing agonists A23187 and CryIC toxin induce arachidonic acid release and translocation of green fluorescent protein (GFP)-cPLA₂ to the nuclear envelope. cPLA₂ is phosphorylated on multiple sites in Sf9 cells; however, only S505 phosphorylation partially contributes to cPLA₂ activation. Although okadaic acid does not increase calcium, mutating the calcium-binding residues D43 and D93 prevents arachidonic acid release and translocation of cPLA₂, demonstrating the requirement for a functional C2 domain. However, the D93N mutant is fully functional with A23187, whereas the D43N mutant is nearly inactive. The C2 domain of cPLA₂ linked to GFP translocates to the nuclear envelope with calcium-mobilizing agonists but not with okadaic acid. Consequently, the C2 domain is necessary and sufficient for translocation of cPLA₂ to the nuclear envelope when calcium is increased; however, it is required but not sufficient with okadaic acid.

Key Words: phospholipase A₂ • calcium • phosphorylation • C2 domain • Sf9 cells

Abbreviations used in this paper: cPLA₂, cytosolic phospholipase A₂; GFP, green fluorescent protein; HSA, human serum albumin; PKC, protein kinase C; Sf9, Spodoptera frugiperda.

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