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

Covalent attachment of palmitoleic acid (C16:1 delta 9) to proteins in Saccharomyces cerevisiae. Evidence for a third class of acylated proteins.

Saccharomyces cerevisiae was used as a model system to characterize the covalent attachment of palmitoleic acid to proteins. Chemically synthesized cis-[9,10-3H]hexadecenoic acid (palmitoleic acid) was used to demonstrate the attachment of this lipid species to at least six proteins (m = 122, 58, 45, 41, 31, and 17 kDa). The majority of the labeled proteins are distinct from those labeled with [3H]palmitic acid (16:0). Based on the lability of the bond in the presence of methanolic KOH or hydroxylamine (pH 8), we propose that [3H] palmitoleic acid is attached to proteins via a thioester linkage. The identity of the palmitoleic acid was established by C-18 reverse phase high performance thin layer chromatography and argentation thin layer chromatography analysis after the fatty acid was liberated from the proteins by either transesterification or saponification. Incorporation of [3H]palmitoleic acid into proteins was only slightly inhibited (relative to [3H] myristic acid) by the presence of cycloheximide, indicating that the attachment of [3H]palmitoleic acid occurs post-translationally. This report is the first description of multiprotein acylation by a long chain unsaturated fatty acid.[1]


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