Synthetic and Chemical Biological Studies of the Diazofluorene Antitumor Antibiot

重氮芴抗肿瘤抗生素的合成及化学生物学研究

• 批准号: 8305516
• 负责人: Seth B. Herzon
• 金额: $ 29.75万
• 依托单位: YALE UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-09-01 至 2016-04-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8305516
• 关键词: Antineoplastic Agents; Area; Bacteria; Bacterial Infections; Biological; Biological Factors; Cancer cell line; Carbohydrates; Cell Line; Chemicals; Complement; Coupled; Coupling; DNA; DNA Damage; Development; Digit structure; Dimerization; Disease; Evaluation; Evaluation Studies; Exhibits; Family; Foundations; Glycosides; Goals; Human; Infection; Investigation; Laboratories; Lead; Malignant Neoplasms; Malignant neoplasm of ovary; Methods; Mission; Modeling; Mono-S; Ovarian; Pathway interactions; Peripheral; Phase; Preparation; Process; Public Health; Quinones; Reaction; Reporting; Research; Role; Route; Solid; Structure; Structure-Activity Relationship; Study models; Therapeutic; United States National Institutes of Health; Work; analog; anticancer activity; base; cancer cell; cancer therapy; cytotoxicity; functional group; inhibitor/antagonist; insight; kinamycin F; lomaiviticin A; member; method development; microbial; novel; pharmacophore; small molecule; success; synthetic construct; tissue culture

DESCRIPTION (provided by applicant): This proposal describes the synthesis and study of the kinamycins and lomaiviticin A, bacterial metabolites with unprecedented structures and powerful biological activities. These isolates are nanomolar inhibitors of human cancers and microbial infections, which are among the public health issues that are central to the mission of the NIH. Lomaiviticin A is active against ovarian cell lines at single-digit picomolar concentrations, and is approximately 2-5 orders of magnitude more potent than any of the kinamycins. Overall, lomaiviticin may be regarded as a dimeric form of the kinamycins, although other structural dissimilarities exist, most notably four 2, 6-dideoxycarbohydrate residues that are found only in lomaiviticin. Common to all of these metabolites is a unique diazofluorene functional group, which has not been seen before in natural products. This functional group has been established as reactive under reducing conditions, but a clear understanding of the role of this reactivity in the observed biological activity of lomaiviticin A has not been developed. The objective of the proposed research is to complete the synthesis of lomaiviticin A and to elucidate the mechanism of action of this natural product. We hypothesize that the diazofluorene functional group is essential to biological activity, and that peripheral substituents can be used to modulate its reactivity. In order to probe this hypothesis, we will complete the synthesis of lomaiviticin A by developing a method for the dimerization of two "monomeric" precursors. A robust dimerization method will facilitate the preparation of simple dimeric diazofluorenes for chemical biological investigations. In parallel with these synthetic studies, we have initiated, and will continue, chemical biological investigations to elucidate the mechanism of action of lomaiviticin A. Evidence to date suggests lomaiviticin A targets DNA by a unique mode of interaction. Therefore we will focus our efforts on understanding the interaction of lomaiviticin and related analogs with DNA. Additionally, we will seek to understand the influence of substituent effects on the reactivity of the diazofluorene, with the goal of identifying easily-prepared, diazofluorene-based anticancer agents. To achieve this, we will conduct structure-function studies and probe the interaction of our synthetic constructs, and the natural product, with DNA. We expect that our research will enable efficient access to this entire family of natural products and related diazofluorenes, thereby overcoming the synthetic obstacles that have hindered the study of these natural products. These synthetic studies are complemented by our chemical biological investigations, which are aimed at developing a lucid understanding of the mechanism of action of lomaiviticin. These are important contributions that will provide the foundation for detailed evaluation of these natural products as new treatments for cancers and bacterial infections.

描述（由申请人提供）：该提案描述了运动霉素和洛马维霉素A的合成和研究，这些细菌代谢物具有前所未有的结构和强大的生物活性。这些分离物是人类癌症和微生物感染的纳摩尔抑制剂，这些是美国国立卫生研究院使命的核心公共卫生问题之一。 Lomaiviticin A 在个位数皮摩尔浓度下具有对抗卵巢细胞系的活性，并且比任何运动霉素的效力大约强 2-5 个数量级。总体而言，洛马伊霉素可被视为运动霉素的二聚形式，尽管存在其他结构差异，最显着的是仅在洛马伊霉素中发现的四个 2, 6-二脱氧碳水化合物残基。所有这些代谢物的共同点是独特的重氮芴官能团，以前在天然产物中从未见过。该官能团已被确定在还原条件下具有反应性，但尚未明确了解该反应性在观察到的洛马维霉素 A 生物活性中的作用。 本研究的目的是完成 Lomaiviticin A 的合成并阐明这种天然产物的作用机制。我们假设重氮芴官能团对于生物活性至关重要，并且外围取代基可用于调节其反应性。为了探讨这一假设，我们将通过开发一种两种“单体”前体二聚化的方法来完成 lomaiviticin A 的合成。强大的二聚方法将有助于制备用于化学生物学研究的简单二聚重氮芴。 在这些合成研究的同时，我们已经开始并将继续进行化学生物学研究，以阐明 lomaiviticin A 的作用机制。迄今为止的证据表明 lomaiviticin A 通过独特的相互作用模式靶向 DNA。因此，我们将集中精力了解 lomaiviticin 及相关类似物与 DNA 的相互作用。此外，我们将寻求了解取代基效应对重氮芴反应性的影响，目的是识别易于制备的基于重氮芴的抗癌剂。为了实现这一目标，我们将进行结构功能研究，并探讨我们的合成结构和天然产物与 DNA 的相互作用。 我们希望我们的研究能够有效地获取整个天然产物家族和相关的重氮芴，从而克服阻碍这些天然产物研究的合成障碍。这些合成研究得到了我们的化学生物学研究的补充，其目的是对洛马维霉素的作用机制有一个清晰的了解。这些都是重要的贡献，将为详细评估这些天然产物作为癌症和细菌感染的新疗法奠定基础。