PHYSICAL STUDIES OF DRUG AND PROTEIN-DNA INTERACTIONS

拟议的研究涉及药物-DNA加合物的荧光研究， proteins. 这些系统的复杂排放将通过以下方式解决： 时间分辨荧光衰减数据的全球分析， 不同的实验条件。 吡咯并（1，4）- 苯并二氮卓类抗肿瘤抗生素与DNA将表征使用 光谱和流体动力学技术。 DNA序列的影响， 构象对共价药物-DNA相互作用的影响将在 合成和天然DNA的荧光和CD实验。 的 药物结合对DNA溶液构象的影响将通过 静态和动态光散射。 这些抗生素提供了新的 DNA双螺旋中快速内部运动的荧光探针。 DNA 动力学将通过荧光去极化测量进行研究， 时域和频域。 的发射各向异性数据 共价药物-DNA加合物将根据预测的 非指数衰减律 影响因素动态 将对DNA结构的影响进行研究。 两种酶参与 核酸代谢将通过稳态和 时间分辨荧光测量。 终端的交互作用 具有单体和聚合物底物的腺苷脱氨酶的转移酶 将表征基态和过渡态抑制剂。 配体结合对蛋白质构象动力学的影响将是 测定 上述研究旨在阐明DNA的作用 生物功能的灵活性。 它还提供了深入了解 抗肿瘤抗生素和重要酶的作用机制 人类白血病

The proposed research involves fluorescence studies of drug-DNA adducts and proteins. The complicated emissions from these systems will be resolved by global analysis of time-resolved fluorescence decay data obtained under different experimental conditions. The interaction of pyrrolo(1,4)- bensodiazepine antitumor antibiotics with DNA will be characterized using spectroscopic and hydrodynamic techniques. The effects of DNA sequence and conformation on the covalent drug-DNA interaction will be investigated in fluorescence and CD experiments with synthetic and natural DNAs. The effects of drug binding on DNA solution conformation will be determined by static and dynamic light scattering. These antibiotics provide a new fluorescent probe for rapid internal motions in the DNA double helix. DNA dynamics will be studied by fluorescence depolarization measurements in the time as well as frequency domains. The emission anisostropy data for covalent drug-DNA adducts will be analyzed according to the predicted nonexponential decay law. The effects on the dynamics of factors influencing DNA structure will be examined. Two enzymes involved in nucleic acid metabolism will be investigated by steady-state and time-resolved fluorescence measurements. The interactions of terminal transferase with monomer and polymer substrates and of adenosine deaminase with ground-state and transition-state inhibitors will be characterized. The effects of ligand binding on protein conformation nand dynamics will be determined. The above research is aimed at elucidation of the role of DNA flexibility in biological function. It also offers insight into the mechanism of action of antitumor antibiotics and of enzymes important in human leukemia.