The Facility for Atomic Mutagenesis

蛋白质结构解析的不断进步导致了大量的蛋白质的产生。 高分辨率数据，在越来越多的原生环境中。然而，特别是在跨膜的情况下， 蛋白质，高分辨率功能分析的实验选择仍然有限，因此实用性也有限 对人类神经系统疾病的了解同样有限。而且 获得的结构代表蛋白质的单个静态快照，尽管这些结构可能具有多个 具有功能意义的构象。因此，离子通道和膜之间的需求越来越大 由NINDS支持的生物物理学社区，用于直接报告功能的试剂 以及活细胞中膜蛋白的动力学。这些问题的优雅解决方案是无稽之谈 抑制，一种可以在感兴趣位点编码任何类型合成氨基酸的方法 在蛋白质中。这些所谓的非天然氨基酸可以采取单原子残基的形式 取代或具有新的荧光性质的侧链。虽然有多种实验途径， 存在编码非天然氨基酸的方法，每种方法都与重大的技术挑战相关。因此，这 强大的方法仍然是大多数研究分子神经科学的研究人员无法获得的。2014年 为了回应其他研究人员的大量询问，爱荷华州大学（UI）的埃亨实验室开始着手 简化酰化正交tRNA的传播，无义抑制的关键组分， 涉及真核生物膜蛋白的实验。为此，我们对底层 化学，使其更强大，并允许编码一组化学上更多样化的氨基 acids.此外，这些新试剂显示出极大改善的稳定性，因此便于运输 在我们的试剂和指导下，许多新的用户群体已经 成功地将这种以前很难的方法应用于与NINDS相关的各种膜蛋白 使命。总的来说，这些努力产生了一个高功能的合作外联服务， 原子诱变实验室”此资源将提供广泛的访问自定义试剂的废话 抑制，这一设施能够迅速适应或设计合成方法，以满足一个国家的利益。 新用户的应用。随着技术的标准化和用户群的扩大，我们将 相应地扩大规模，利用UI Carver医学院和当地的基础设施 如DNA整合技术。这些合作最终将支持更多 有效传播这些研究工具，以回答分子神经科学中的各种问题。他们的 不断增长的用户群、年度培训研讨会、基于网络的论坛和出版物将推动使用 在开放获取的同行评审期刊上发表的协议。我们的顾问委员会- Kossiakoff，Perozo，Koide，Nakamoto - 将确保关键资源的有效管理，并使我们的战略愿景与NINDS保持一致。

Ongoing advances in the elucidation of protein structures are leading to the production of large volumes of high-resolution data, in increasingly native environments. However, especially in the case of transmembrane proteins, experimental options for high-resolution functional analyses remain limited, and thus the usefulness of the structures in understanding human neurological diseases likewise remains limited. Moreover, the structures that are obtained represent single, static snapshots of proteins, although these likely have multiple conformations of functional significance. Thus, there is a growing need among the ion channel and membrane biophysics community, which is supported by the NINDS, for reagents that directly report on the functionality and dynamics of membrane proteins in live cells. An elegant solution to these problems is nonsense suppression, a method that makes it possible to encode any type of synthetic amino acid at a site of interest within a protein. These so-called unnatural amino acids can take the form of residues with single atom substitutions, or side-chains with novel fluorescent properties. Although multiple experimental avenues for the encoding of unnatural amino acids exist, each is associated with significant technical challenges. As such, this powerful approach remains inaccessible to most investigators studying molecular neuroscience. In 2014, in response to numerous inquiries by other investigators, the Ahern lab at the University of Iowa (UI) set out to simplify the dissemination of acylated orthogonal tRNAs, key components in nonsense suppression, for experiments involving eukaryotic membrane proteins. To this end, we made improvements to the underlying chemistry, making it more robust and allowing for the encoding of a more chemically diverse set of amino acids. In addition, these new reagents display vastly improved stability profiles thus allowing for easy shipping to laboratories throughout the U.S. With our reagents and guidance, a number of new user groups have successfully applied this previously difficult approach to a variety of membrane proteins relevant to the NINDS mission. Overall, these efforts have produced a high-functioning collaborative outreach service, “The Facility for Atomic Mutagenesis.” This resource will provide broad access to custom reagents for nonsense suppression, and this facility is able to quickly adapt or design synthetic approaches to meet the interests of an application by new users. As the technologies become more standardized and our user group expands, we will scale accordingly, taking advantage of infrastructure present with the UI Carver College of Medicine and local industrial partners such as Integrated DNA Technologies. These collaborations will ultimately support more efficient dissemination of these research tools, to answer diverse questions in molecular neuroscience. Their use will be buoyed by a growing user base, annual training seminars, web-based forums and published protocols in open-access peer-reviewed journals. Our Advisory Board – Kossiakoff, Perozo, Koide, Nakamoto – will ensure efficient stewardship of key resources and the alignment of our strategic vision to NINDS.