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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Inhibition of actin regulatory activity of the 74-kDa protein from bovine adrenal medulla (adseverin) by some phospholipids.

A 74-kDa protein (adseverin) derived from adrenal medulla severs actin filaments and nucleates actin polymerization in a Ca2(+)-dependent manner but does not form an EGTA-resistant complex with actin monomers, which is different from the gelsolin-actin interaction. The dissociation of gelsolin-actin complexes by phosphatidylinositol 4,5-bisphosphate (PIP2) and the inhibitory effect on actin filament severing by gelsolin was recently reported. This study shows that the activity of adseverin is inhibited not only by PIP2 but also by some common phospholipids including phosphatidylinositol (PI) and phosphatidylserine (PS). Other phospholipids such as phosphatidylcholine (PC) and phosphatidylethanolamine (PE) showed no effect. The addition of PC or PE to PI diminished the inhibitory effect of PI. Triton X-100 and neomycin were also found effective in suppressing the effect of PI, suggesting that the arrangement of polar head groups is important in exerting the inhibitory effect. Ca2(+)-dependent binding of adseverin to PS liposomes but not to PC or PE liposomes was observed by a centrifugation assay.[1]


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