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Specific Metal‐Oligonucleotide Binding Studied by High Resolution Tandem Mass Spectrometry
Author(s) -
Wu Qinyuan,
Cheng Xueheng,
Hofstadler Steven A.,
Smith Richard D.
Publication year - 1996
Publication title -
journal of mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 1076-5174
DOI - 10.1002/(sici)1096-9888(199606)31:6<669::aid-jms340>3.0.co;2-5
Subject(s) - chemistry , fourier transform ion cyclotron resonance , electrospray ionization , mass spectrometry , metal , oligonucleotide , metal ions in aqueous solution , tandem mass spectrometry , phosphodiester bond , ion , collision induced dissociation , analytical chemistry (journal) , chromatography , dna , organic chemistry , rna , biochemistry , gene
Electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (ESI‐FTICR‐MS) was used to study the binding of metal ions to two oligonucleotides, d(pGCTTGCATp) and d(TTGGCCCTCCTT). Collision‐induced dissociation (CID) of the metal–oligonucleotide complex revealed that metal ions preferentially bound to the central thymine region of the sequence. The most probable binding sites were the phosphodiester backbone since the sum of the maximum number of charge addition from the metal ions and the charge state of the whole complex was found to be equal to the number of ionizable protons on the DNA backbone. Although site‐specific and sequence‐specific binding was observed for all three of the metal ions studied, the binding specificity of UO 2 2+ ions was significantly greater than for Mg 2+ and Na + . These experiments demonstrate that ESI‐MS/MS can be applied to study the binding of metal ions and their complexes to oligonucleotides, providing not only information on the number of metal ions binding to the oligonucleotide, but also information related to the binding site(s) and binding specificity.