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Marker null for mass spectrometry of phosphorylation protein and phosphorylation position analysis
Marker null for mass spectrometry of phosphorylation protein and phosphorylation position analysis
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机译：磷酸化蛋白质谱分析和磷酸化位置分析的无效标记
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摘要
Disclosed is a method of analyzing mass of the phosphoproteins or phosphopeptides and of analyzing phosphorylated positions at a phosphoprotein or phosphopeptide, comprising the steps of: 1) dephosphorylating at least one Ser and/or Thr residue of the phosphoprotein or phosphopeptide; 2) tagging the dephosphorylated amino acid residues with a tag having a R-L-G moiety wherein R is a nucleophilic functional group that selectively bind with dephosphorylated amino acid residues, G is selected from the group consisting of guanidine moiety or protected guanidine moiety such as a mono-N-protected guanidino group, a di-N,N'-protected guanidino group and an N'-protected guanidino group, and L is a linker linking the R and the G; and 3) subjecting the tagged proteins or peptides to mass spectrometry. The method is capable of precisely analyzing mass of phosphoproteins of trace amounts as well as positions of phosphoryated amino acids.
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