https://scholars.lib.ntu.edu.tw/handle/123456789/177689
標題: | Study of the preferred modification sites of the quinone methide intermediate resulting from the latent trapping device of the activity probes for hydrolases | 作者: | Lo, Lee-Chiang Chiang, Ying-Ling Kuo, Chi-Hsien Liao, Hsin-Kai Chen, Yu-Ju Lin, Jing-Jer JING-JER LIN LEE-CHIANG LO |
關鍵字: | uinone methide;Hydrolases;Protein tyrosine phosphatase;Glucosidase;Cysteine;Labeling;Proteome;Activity probe;Mechanismbased | 公開日期: | 2005 | 出版社: | Taipei:National Taiwan University Dept Chem Engn | 卷: | 326 | 期: | 1 | 起(迄)頁: | 30-35 | 來源出版物: | Biochemical & Biophysical Research Communications | 摘要: | Use of activity probes has been demonstrated to be a powerful tool in modern chemical proteomic study. Previously we have designed & synthesized a series of mechanism-based activity probes that utilized quinone methide chemistry. Here, we characterized the trend of chemical reactivity for the reactive quinone methide intermediate 3 (QM-3) resulting from the latent trapping device. In a competition assay, the labeling of PTP1B by probe 1a was blocked by externally added cysteine without affecting the catalytic activity of the enzyme. Further sequencing analysis on the trypsin-digested peptides of probe 1a-labeled PTP1B using tandem mass spectrometry revealed that all six cysteine residues of PTP1B are capable of being modified by probe 1a. These results indicated that the sulfhydryl group of cysteine residue is the preferred nucleophile for the reactive QM-3. Our finding provides the first example in understanding the preferred amino acid residues modified by the reactive QM-3, which is also the key structural unit responsible for forming covalent bonds in many biochemical applications. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/2006111501265139 http://ntur.lib.ntu.edu.tw/bitstream/246246/2006111501265139/1/4199.pdf |
其他識別: | 246246/2006111501265139 | DOI: | 10.1016/j.bbrc.2004.11.003 |
顯示於: | 化學系 |
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