Phosphorylated peptide detection

05-May-2009 - Japan

Itaru Hamachi and colleagues from Kyoto University have created a chemosensor that shows a high binding selectivity towards (i, i+1) bisphosphorylated peptide, displaying a dual-emission fluorescence change.

Phosphorylated peptide detection

Fluorescent Chemosensor for phosphorylated peptide.

'Development of artificial chemosensors that can detect phosphorylated proteins or peptides is useful to analyze their functions and the activities of relevant protein kinase and phosphatase,' Hamachi explains. 'This helps our understanding of cell signaling and the development of therapeutics and medical diagnosis for the related disease.'

'Sequence- or site-specific detection of a certain protein phosphorylation with an artificial chemosensor still remains a challenging task' says Hamachi. 'We have developed a new fluorescent chemosensor on the basis of a unique molecular design; the two phosphate recognition sites are directly conjugated with a rigid fluorophore.'

Hamachi explains that the high binding selectivity of their chemosensor towards (i, i+1) bis-phosphorylated peptide, and the clear dual-emission change on formation of the binding complex, cannot be readily achieved with previously reported chemosensors. 'We anticipate that the present molecular design would be generally applicable for sequence selective detection of various types of (i, i+n) bis-phosphorylated peptides, by adjustable elongation of the olefine spacer unit between the two phosphate recognition sites.'

Original article: Ishida et al.; Chem. Commun. 2009

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