Gold(I)-Phosphine-N-Heterocycles: Biological Activity and Specific (Ligand) Interactions on the C-Terminal HIVNCp7 Zinc Finger

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• 作者：Camilla Abbehausen ; Erica J. Peterson ; Raphael E. F. de Paiva ; Pedro P. Corbi ; Andr茅 L. B. Formiga ; Yun Qu ; Nicholas P. Farrell
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：October 7, 2013
• 年：2013
• 卷：52
• 期：19
• 页码：11280-11287
• 全文大小：360K
• 年卷期：v.52,no.19(October 7, 2013)
• ISSN：1520-510X

文摘

The syntheses and the characterization by chemical analysis, ¹H and ³¹P NMR spectroscopy, and mass spectrometry of a series of linear triphenylphosphine gold(I) complexes with substituted N-heterocycle ligands (L), [(PPh₃)Au(I)(L)]⁺, is reported. The reaction of [(PPh₃)Au(L)]⁺ (L = Cl^{鈥?/sup> or substituted N- heterocyclic pyridine) with the C-terminal (Cys₃His) finger of HIVNCp7 shows evidence by mass spectrometry (ESI-MS) and 31P NMR spectroscopy of a long-lived {(PPh₃)Au}-S-peptide species resulting from displacement of the chloride or pyridine ligand by zinc-bound cysteine with concomitant displacement of Zn2+. In contrast, reactions with the Cys₂His₂ finger-3 of the Sp1 transcription factor shows significantly reduced intensities of {(PPh₃)Au} adducts. The results suggest the possibility of systematic (electronic, steric) variations of 鈥渃arrier鈥?group PR₃ and 鈥渓eaving鈥?group L as well as the nature of the zinc finger in modulation of biological activity. The cytotoxicity, cell cycle signaling effects, and cellular accumulation of the series are also reported. All compounds display cytotoxicity in the micromolar range upon 96 h continuous exposure to human tumor cells. The results may have relevance for the reported inhibition of viral load in simian virus by the gold(I) drug auranofin.}