Attempt to Detect Natural Anticancer Compounds—Protein Binding through Precursor Ion Scan and MS/MS Measurements
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- NEGISHI Jun
- Department of Life Science and Biotechnology, Faculty of Chemistry, Material and Bioengineering
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- SHIRAHAMA Tatsuya
- Department of Life Science and Biotechnology, Faculty of Chemistry, Material and Bioengineering
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- NAGAOKA Yasuo
- Department of Life Science and Biotechnology, Faculty of Chemistry, Material and Bioengineering High Technology Research Center, Kansai University
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- TAKEMOTO Yoshiki
- Department of Life Science and Biotechnology, Faculty of Chemistry, Material and Bioengineering
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- UESATO Shinichi
- Department of Life Science and Biotechnology, Faculty of Chemistry, Material and Bioengineering High Technology Research Center, Kansai University
Bibliographic Information
- Other Title
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- Attempt to detect natural anticancer compounds: protein binding through precursor ion scan and MS/MS measurements
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Abstract
A 2′-succinyltaxol-bovine serum albumin (BSA) conjugate was prepared as an antigen to produce an anti-taxol monoclonal antibody by immunizing mice. Formation of a linkage between hapten and protein is usually confirmed by the UV or fluorescamine method. However, it was difficult to confirm the binding of 2′-succinyltaxol to BSA by these methods owing to the similar UV absorption maxima of 2′-succinyltaxol (273 nm) and BSA (280 nm). In the present study, we therefore conducted a mass spectrometric analysis using the precursor ion scan and MS/MS techniques to confirm the formulation of the 2′-succinyltaxol-BSA conjugate in the following way: The conjugate was subjected to thermal denaturalization, dithiothreitol (DTT)-reduction, iodoacetamide-alkylation and trypsin-digestion, affording a peptide fragment mixture. This was then analyzed by electrospray ionization (ESI)-MS in the positive mode by scanning the peaks containing a mass of 854 corresponding to taxol. The detected peaks were in turn subjected to MS/MS measurements. Among them, a peak at m/z 1247.4 was found to be a peptide fragment containing Lys (ε-2′-succinyltaxol), demonstrating the formulation of the 2′-succinyltaxol-BSA conjugate. In order to confirm the feasibility of this analytical method, the deacetylvinblastine (deacetylVLB)-BSA antigen which produced the anti-VLB monoclonal antibody (MAb-10-A9), was subjected to the same analytical treatment as above, giving a peak at m/z 851.3 originating from a Lys (ε-deacetylVLB). Thus, this new method could serve as an additional tool for confirmation of the formation of hapten-protein conjugates which are difficult to detect by the above spectrophotometric methods.<br>
Journal
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- YAKUGAKU ZASSHI
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YAKUGAKU ZASSHI 128 (9), 1317-1323, 2008-09-01
The Pharmaceutical Society of Japan
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Details 詳細情報について
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- CRID
- 1390001206126522624
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- NII Article ID
- 110006873990
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- NII Book ID
- AN00284903
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- ISSN
- 13475231
- 00316903
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- NDL BIB ID
- 9636386
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed