Steric-free labeling strategies to study disease-related non-histone substrates of post-translational modifications

首席研究员/项目主任(最后、第一、中间)：Wang、Ross、E. 无立体标记策略用于研究与疾病相关的非组蛋白底物 翻译修饰语 拟议的研究将询问基于氟-硫醇的生物正交反应，以进行无空间标记 翻译后修改(PTM)。尽管最近在生物医学研究方面取得了进展，但疾病仍然 困扰着人类。许多癌症类型仍然是致命的，对传统疗法具有耐药性，而大多数 炎症性疾病会造成慢性或长期的负担，缺乏选择性免疫抑制。 在市场上。因此，需要新的治疗方法。PTM最近已经成为一类 可能揭开潜在的新治疗靶点的重要生物途径。PTMS修改现有 具有额外化学功能的蛋白质，以调节蛋白质功能，从而调节各种细胞 活动。据报道，PTM相关蛋白的失调是某些人类疾病的关键，如 癌症和炎症性疾病。然而，这些非组蛋白的特性还不完全清楚。 已澄清。目前这一领域的研究在很大程度上依赖于化学蛋白质组学，即用 乙炔或叠氮修饰的PTM辅因子或前体。PTM部位上的这些化学标记稍后可以 通过使用用于成像的荧光团或生物素亲和探针的生物正交点化学原位衍生化 用于下拉和基于蛋白质组学的目标识别。然而，这些基于乙炔/叠氮的标签在 长度和大小，以及对于许多情况下标记了炔或叠氮的PTM前体/辅因子(例如，用于乙酰化， 甲基化)几乎没有结合到底物上，从而限制了与PTM相关的靶标识别。 为了解决这个问题，这里将开发一种创新的化学标记方法，它可以是无空间的， 并可广泛用于与重要的各种类型的PTM相关的蛋白质的全球图谱 与人类疾病的发病或复发有关。我们假设，与叠氮化物和炔烃不同，氟标记可以 最好地模拟了固有的碳氢键，因此是无空间位阻的，并且通常适用于标签PTM 辅因子/前体物。第一个研究主旨是利用化学合成对普通的PTM进行衍生化。 辅因子/前体与氟结合，然后劫持PTM生物途径，以氟标记底物蛋白， 最后用硫醇衍生的探针修饰氟化底物蛋白质以用于成像或蛋白质 身份证明。第二个研究重点涉及将这种氟-硫醇标记策略应用于 询问PTM的底物蛋白，它们对癌细胞的生存具有潜在的重要作用，但不是 普通细胞。最后的推力将研究介导人类T细胞激活的PTMS的底物，以及 对调节自身反应性免疫反应具有潜在的关键作用。 这些研究目标的完成将导致一种化学标记方法的发明，这种方法可以有效地 准确识别与疾病相关的亚细胞成分。这一战略将导致系统性的剖析。 与PTM相关的疾病信号。取得的成果将大大加快疾病的诊断和治疗， 还将产生一个工具箱，里面有无空间位阻的PTM探针，造福于科学界。 第1页

Principal Investigator/Program Director (Last, first, middle): Wang, Ross, E. Steric-free labeling strategies to study disease-related non-histone substrates of post- translational modifications The proposed research will interrogate fluorine-thiol based bioorthogonal reactions for steric-free labeling of post-translational modifications (PTMs). Despite recent advances in biomedical research, diseases are still haunting human beings. Many cancer types remain lethal and are resistant to traditional therapy, while most inflammatory diseases result in chronic or long-term burdens, and there is a lack of selective immunosuppressive on the market. Thus, new therapeutic approaches are needed. PTMs have recently emerged as a class of important biological pathways that could unravel potentially novel therapeutic targets. PTMs modify existing proteins with additional chemical functionalities to modulate protein function, and thereby mediate various cellular activities. Dysregulation of PTM-related proteins has been reported to be key to certain human diseases such as cancer and inflammatory disorders. Yet, the identity of these non-histone proteins has not been fully elucidated. Current research in this area heavily relies on chemical proteomics, which tags target proteins with alkyne or azide- modified PTM cofactors or precursors. These chemical tags on PTM sites can later be derivatized in situ through bio-orthogonal `click chemistry' with a fluorophore for imaging or a biotin affinity probe for pull down and proteomics-based target identification. However, these alkyne/azide- based tags are bulky in length and size, and for many cases alkyne or azide- tagged PTM precursors/cofactors (e.g. for acetylation, methylation) were barely incorporated onto substrates, thereby limiting PTM-related target identification. To solve this issue, an innovative chemical tagging approach will be developed here, which could be steric free, and can be broadly used for the global profiling of proteins related to various types of PTMs that are important to the onset or relapse of human diseases. We hypothesize that unlike azides and alkynes, fluorine labeling can best mimic the intrinsic carbon-hydrogen bond, and is thereby steric free and generally applicable to tag PTM cofactors/precursors. The first research thrust seeks to utilize chemical synthesis to derivatize common PTM cofactor/precursors with fluorine, then to hijack the PTM biological pathway to tag substrate proteins with fluorine, and finally to modify the fluorinated substrate proteins with thiol-derivatized probes for imaging or protein identification. The second research thrust involves the application of this fluorine-thiol tagging strategy to interrogate the substrate proteins of PTMs, which are potentially important to the survival of cancer cells, but not regular cells. The final thrust will investigate the substrates of PTMs which mediate human T cell activation, and are potentially pivotal to the modulation of auto-reactive immune responses. Completion of these research goals will result in the invention of a chemical labeling method that efficiently and accurately identifies disease-associated subcellular components. This strategy will lead to a systemic dissection of PTM-related disease signaling. The achieved results will greatly accelerate disease diagnosis and treatment, and will also result in a tool box of steric-free PTM probes for the benefit of the scientific community. Page 1