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- W2024467420 abstract "Modification of the natural phosphodiester backbone of deoxyribooligonucleotides can impart increased biostability via nuclease resistance. Further, uniform incorporation of phosphorothioate linkages renders oligonucleotides highly resistant to reagents traditionally used in sequencing reactions. As a consequence, analytical tests crucial for establishing the identity of such oligonucleotide drugs are less informative. To circumvent this problem, chemical oxidation has been employed for converting the phosphorothioate to the uniform phosphodiester, thereby facilitating enzymatic degradation. Following oxidation, exonucleases which sequentially cleave individual bases from the 3' or 5' terminus of the oligonucleotide or base-specific cleavage chemicals were used to facilitate sequence identification of the oligonucleotide. Matrix-assisted laser desorption ionization-time-of-flight/mass spectrometry (MALDI-TOF/MS), previously used to sequence natural phosphodiester DNA, was then used to sequence the chemically oxidized phosphorothioate. Sequential enzymatic cleavage of desulphurized phosphorothioates in combination with MALDI analysis not only provides a viable alternative to radiolabeling as used in conventional sequencing approaches (e.g. Maxam-Gilbert), but also enables rapid sequencing of phosphorothioate oligonucleotides, for routine drug analysis." @default.
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- W2024467420 date "1995-09-01" @default.
- W2024467420 modified "2023-09-26" @default.
- W2024467420 title "Sequence analysis of phosphorothioate oligonucleotides via matrix-assisted laser desorption ionization time-of-flight mass spectrometry" @default.
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- W2024467420 doi "https://doi.org/10.1016/0731-7085(95)01534-r" @default.
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