CHARACTERIZATION OF THE RNA BINDING MODE OF A PLATINUM-ACRIDINE AGENT

Pt-ACRAMTU (ACRAMTU = 1-[2-(acridin-9-ylamino)ethyl]-1,3-dimethylthiourea) is a DNA-targeted anticancer agent that shows activity in a broad range of solid tumor cell lines. Unlike the classical platinum-based cross-linking drugs, this agent produces its cytotoxic effect by two synergistic DNA binding mechanisms: monofunctional platination and intercalation of the acridine chromophore. The RNA binding of platinum drugs has been studied to a much lesser extent. Recently, the RNA interactions of platinum-containing drugs and drug conjugates have been reported. In the current study, an RNA hairpin has been generated through in vitro transcription and treated with Pt-ACRAMTU. Our goal was to determine if specific RNA structural motifs are susceptible to intercalator-driven platination. Acidic digestion assays in conjunction with liquid chromatography-electrospray mass spectrometry analysis (LC-ESMS) was used to determine the specific bases modified by platinum. In addition, the RNA conformational changes induced by ACRAMTU and PT-ACRAMTU were also analyzed by circular dichroism (CD) spectroscopy.

Grantor dc:publisher

Wake Forest University

Year dc:date.issued

2009

Author dc:creator

• Vasquez-Valdivieso, Montserrat Guadalupe

• Biochemistry

Language dc:language.iso

en

Handle dc:identifier.uri

http://hdl.handle.net/10339/14770

OAI identifier oai:identifier

oai:wakespace.lib.wfu.edu:10339/14770