Fluorescent nanoparticles consisting of lipopeptides and fluorescein-modified polyanions for monitoring of protein kinase activity

Haruka Koga, Riki Toita, Takeshi Mori, Tetsuro Tomiyama, Jeong Hun Kang, Takuro Niidome, Yoshiki Katayama

    Research output: Contribution to journalArticlepeer-review

    17 Citations (Scopus)

    Abstract

    Protein kinase (PK)-responsive nanoparticles (NPs) comprising a hydrophobically modified peptide substrate for PKs and a fluorescein-labeled polyanion (pA-F) were reported for monitoring PK activity via fluorescence intensity measurements. In this system, the formation of NPs by mixing lipopeptides and pA-Fs results in fluorescence quenching, while the quenched fluorescence recovered following dissociation of the NPs owing to the phosphorylation reaction of PKs. Eleven lipopeptides with different hydrophobic moieties (hydrocarbon and lithocholic acid) and four pA-Fs having main chains with differing flexibilities and fluorescein contents were synthesized and used to fabricate a series of twenty-four PK-responsive NP probes. The responses of the PK-responsive NP probes to PKs were evaluated to screen the most suitable NP probes. The assay system was then used to determine the IC 50 values for five inhibitors, the results of which were very similar to those previously reported. Thus, PK-responsive NPs are useful tools for high-throughput screening (HTS) of PK inhibitors.

    Original languageEnglish
    Pages (from-to)1526-1534
    Number of pages9
    JournalBioconjugate Chemistry
    Volume22
    Issue number8
    DOIs
    Publication statusPublished - Aug 17 2011

    All Science Journal Classification (ASJC) codes

    • Biotechnology
    • Bioengineering
    • Biomedical Engineering
    • Pharmacology
    • Pharmaceutical Science
    • Organic Chemistry

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