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- W2058792246 abstract "The localization of oncogenic Src and Ras proteins to cellular plasma membranes is critical for the proliferation of specific cancers. In addition to other lipid modifications, these proteins require posttranslational palmitoylation of specific cysteine residues by the enzyme palmitoyl acyltransferase (PAT) in order to be stably anchored at plasma membranes. Hence, the identification of inhibitors of protein palmitoylation has significant potential to define a new class of antitumor agents. However, studies of protein palmitoylation have been hindered by the dynamic and reversible nature of cysteine acylation and the lack of sensitive and convenient assays of PAT activity. To facilitate the rapid identification of compounds that affect protein palmitoylation, we report the solid-phase synthesis of a fluorescent cell-permeable palmitoyl acyltransferase substrate that mimics the N-terminus of Src family proteins. Metabolic radiolabeling and epifluorescence microscopy of Jurkat lymphocytes treated with this Src-mimetic lipopeptide revealed that this compound is palmitoylated intracellularly, which confers localization at cellular plasma membranes. Addition of the palmitoylation inhibitor 2-bromopalmitic acid to substrate-treated cells blocked palmitoylation and diminished substrate-mediated plasma membrane fluorescence. Analysis of inhibition of palmitoylation by flow cytometry revealed that this fluorescent lipopeptide substrate represents a highly sensitive molecular probe of palmitoyl acyltransferase activity that enables unprecedented high-throughput assays of protein palmitoylation." @default.
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- W2058792246 date "2002-02-23" @default.
- W2058792246 modified "2023-10-17" @default.
- W2058792246 title "Sensitive and Rapid Analysis of Protein Palmitoylation with a Synthetic Cell-Permeable Mimic of Src Oncoproteins" @default.
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- W2058792246 doi "https://doi.org/10.1021/ja017671x" @default.
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