Research Article
DNA Oxidative Cleavage Induced by the Novel Peptide Derivatives of 3-(quinoxalin-6-yl)alanine in Combination with Cu(II) or Fe(II) Ions
Table 1
ESI-MS characteristics of the complexes of peptides DPQa-Gly, DFQa-Gly, and DPPZa-Gly with Cu(II) and Fe(II) (see Figure
2 for the signals plot).
| | Peptide | Cu(II) | Fe(II) | | Relative intensity | m/z | Stoichiometry of main complex | Relative intensity | m/z | Stoichiometry of main complex |
| | DFQa-Gly | Not detected | — | — | Not detected | — | — | | DPQa-Gly | 20% | 490.0838 | [LCu–H] + | Not detected | — | — | | DPPZa-Gly | 100% | 488.0747 | [L2Cu2–2H]2+ | 100% | 667.1888 | [L3Fe]2+ |
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