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Cytokine Mimetics with Various Modalities 各种模式的细胞因子模拟物
IF 2.3 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-05-14 DOI: 10.1002/ijch.202300163
Katsuya Sakai, Hiroki Sato, Kunio Matsumoto

Cytokines play a central role in regulating cell communication and signal transduction, since they influence processes such as immunity, hematopoiesis, inflammatory disease, cancer, neurological disorders, and tissue healing. Notably, certain cytokines have been used clinically as protein therapeutics for conditions such as cancer, autoimmune diseases, and viral infections. Despite their therapeutic potential, cytokines often pose challenges, including side effects, stability constraints, and suboptimal pharmacokinetics. To address these limitations, there is growing interest in using diverse modalities to develop alternative cytokines with enhanced properties and therapeutic benefits. Of these modalities, effective high-throughput screening of macrocyclic peptides enabled by RNA-based catalysis has emerged as a promising candidate method for the development of alternative cytokines. Here, we focus on the development of cytokine alternatives using various approaches and explore prospects for their future use as therapeutic agents.

细胞因子在调节细胞通讯和信号转导方面发挥着核心作用,因为它们影响着免疫、造血、炎症性疾病、癌症、神经系统疾病和组织愈合等过程。值得注意的是,某些细胞因子已被临床用作治疗癌症、自身免疫性疾病和病毒感染等疾病的蛋白质疗法。尽管细胞因子具有治疗潜力,但也常常带来一些挑战,包括副作用、稳定性限制和药代动力学不理想。为了解决这些局限性,人们越来越有兴趣采用多种方式开发具有更强特性和治疗效果的替代细胞因子。在这些方法中,通过基于 RNA 的催化对大环肽进行有效的高通量筛选已成为开发替代细胞因子的一种很有前景的候选方法。在此,我们将重点介绍利用各种方法开发细胞因子替代品的情况,并探讨它们未来用作治疗剂的前景。
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引用次数: 0
Display Technologies for Expanding the Pharmaceutical Applications of Cyclotides 拓展环苷酸药物应用的显示技术
IF 2.3 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-05-06 DOI: 10.1002/ijch.202400010
Jing Xie, Meng-Wei Kan, Simon J. de Veer, Conan Wang, David J. Craik

Cyclotides are ultra-stable peptides originally discovered in plants based on their medicinal applications. Their natural function is as host defence agents. They are amenable to chemical synthesis for use as scaffolds for drug design applications. Cyclotides comprise ~30 amino acids and in addition to having a head-to-tail cyclic backbone, incorporate six conserved cystine residues connected in a cystine knot motif. The cyclic backbone and cystine knot contribute to their exceptional resistance to proteases or thermal denaturation, making them useful scaffolds for drug design applications. The backbone segments, or loops, between the conserved cysteine residues are amenable to combinatorial variation in native cyclotides and have also been used to incorporate selected bioactive peptide epitopes into a range of synthetic cyclotides and cyclotide-like scaffolds. In the past this was largely done via low throughput structure-based design approaches, but the discovery of novel cyclotide binders has been greatly enhanced by the use of combinatorial display approaches on cyclotide scaffolds using phage, bacterial, yeast and mRNA technologies, as reviewed herein.

环肽是一种超稳定肽,最初是根据其药用价值从植物中发现的。它们的天然功能是作为宿主防御剂。它们易于化学合成,可用作药物设计应用的支架。环肽由约 30 个氨基酸组成,除了具有头对尾的环状骨架外,还包含以胱氨酸结图案连接的六个保守胱氨酸残基。环状骨架和胱氨酸结使它们对蛋白酶或热变性具有超强的抵抗力,从而使它们成为药物设计应用的有用支架。保守的半胱氨酸残基之间的骨架区段或环路可在原生环肽中进行组合变化,也可用于将选定的生物活性肽表位纳入一系列合成环肽和类环肽支架中。过去这主要是通过低通量的基于结构的设计方法来实现的,但通过使用噬菌体、细菌、酵母和 mRNA 技术对环肽支架进行组合展示,新型环肽结合剂的发现得到了极大的提高。
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引用次数: 0
Strategies for Detecting Aminoacylation and Aminoacyl-tRNA Editing in vitro and in Cells 体外和细胞内检测氨基酰化和氨基酰-tRNA 编辑的策略
IF 2.3 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-05-06 DOI: 10.1002/ijch.202400009
Rylan R. Watkins, Arundhati Kavoor, Prof. Karin Musier-Forsyth

Aminoacyl-tRNA synthetases (aaRSs) maintain translational fidelity by ensuring the formation of correct aminoacyl-tRNA pairs. Numerous point mutations in human aaRSs have been linked to disease phenotypes. Structural studies of aaRSs from human pathogens encoding unique domains support these enzymes as potential candidates for therapeutics. Studies have shown that the identity of tRNA pools in cells changes between different cell types and under stress conditions. While traditional radioactive aminoacylation analyses can determine the effect of disease-causing mutations on aaRS function, these assays are not amenable to drug discovery campaigns and do not take into account the variability of the intracellular tRNA pools. Here, we review modern techniques to characterize aaRS activity in vitro and in cells. The cell-based approaches analyse the aminoacyl-tRNA pool to observe trends in aaRS activity and fidelity. Taken together, these approaches allow high-throughput drug screening of aaRS inhibitors and systems-level analyses of the dynamic tRNA population under a variety of conditions and disease states.

氨基酰-tRNA 合成酶(aaRS)通过确保形成正确的氨基酰-tRNA 对来维持翻译的保真度。人类 aaRSs 的许多点突变都与疾病表型有关。对人类病原体中编码独特结构域的 aaRS 的结构研究支持将这些酶作为潜在的候选疗法。研究表明,细胞中 tRNA 池的特性在不同细胞类型和应激条件下会发生变化。虽然传统的放射性氨基酰化分析可以确定致病突变对 aaRS 功能的影响,但这些检测方法不适合药物发现活动,也没有考虑到细胞内 tRNA 池的可变性。在此,我们回顾了表征体外和细胞内 aaRS 活性的现代技术。基于细胞的方法分析氨基酰-tRNA 池,观察 aaRS 活性和保真度的趋势。总之,这些方法可以对 aaRS 抑制剂进行高通量药物筛选,并在各种条件和疾病状态下对动态 tRNA 群体进行系统级分析。
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引用次数: 0
Confinement as a Tool in Chemistry: Accelerated Intracapsular Dimerization of Cyclopentadiene in Water 作为化学工具的封闭:环戊二烯在水中的加速囊内二聚反应
IF 2.3 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-05-03 DOI: 10.1002/ijch.202400017
Amal Sam Sunny, Prof. Vaidhyanathan Ramamurthy

In this study, the occurrence of Diels–Alder reaction of cyclopentadiene yielding dicyclopentadiene within a confined closed space provided by octa acid (OA) in water at room temperature is established. The Diels–Alder reaction within the OA capsule occurs at least 2000 times faster than in water. Catalysis of Diels–Alder reaction by hosts such as cyclodextrin, cucurbituril, and Fujita's Pd nano–host occurs in water. Despite their similarity, these three hosts provide an open environment where the reactant molecules are exposed to aqueous environment. The only fully closed host known to catalyze the Diels–Alder reaction in water is OA. Although Rebek's host is established to catalyze Diels–Alder reaction it occurs in an organic solvent. The closed environment explored in this presentation provides an opportunity to better understand the origin of non–covalent catalysis in a restricted space and in water. Because the product binds stronger than the reactant, disappointingly, the capsule can't be recycled. We recognize that this aspect needs to be addressed for the OA capsule to become synthetically useful. We are in the process of understanding the origin of catalysis and finding ways to make reaction recyclable.

本研究证实,在室温下,环戊二烯在辛酸(OA)提供的密闭空间内发生 Diels-Alder 反应,生成二环戊二烯。在 OA 胶囊内发生的 Diels-Alder 反应比在水中至少快 2000 倍。环糊精、葫芦素和藤田钯纳米宿主等宿主在水中催化 Diels-Alder 反应。尽管它们很相似,但这三种宿主提供了一个开放的环境,使反应物分子暴露在水环境中。已知唯一能在水中催化 Diels-Alder 反应的全封闭宿主是 OA。虽然 Rebek 的宿主可以催化 Diels-Alder 反应,但它是在有机溶剂中发生的。本报告探讨的封闭环境为我们提供了一个机会,使我们能够更好地了解在受限空间和水中非共价催化作用的起源。令人失望的是,由于生成物比反应物的结合力更强,胶囊无法循环使用。我们认识到,要使 OA 胶囊在合成方面发挥作用,就必须解决这个问题。我们正在了解催化的起源,并寻找使反应可回收的方法。
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引用次数: 0
Unraveling the RNA Tapestry: A Symphony of Innovations in m6A Research Technology 揭开 RNA 的神秘面纱:m6A 研究技术创新交响曲
IF 3.2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-04-26 DOI: 10.1002/ijch.202400014
Shengyi Fei, Zheng William Fang, Prof. Boxuan Simen Zhao

This review navigates the evolving landscape of N6-methyladenosine (m6A) research approaches, emphasizing the importance of advanced technology in understanding RNA epigenetics. Beginning with the fundamentals of m6A and the need for high- throughput methods, the investigation progresses from low-throughput approaches to high-throughput technologies, encompassing antibody-dependent and antibody-free sequencing methods, as well as nanopore-based direct mRNA sequencing and computation methods for m6A detection. Spatial techniques and imaging tools for m6A are also introduced in addition. The discussion of their special applications emphasizes the biological significance of absolute quantification, single-nucleotide resolution, single-molecule detection, and single-cell profiling. The review concludes with a vision of ideal approaches that combine current technologies for comprehensive m6A sequencing, with the potential to further our understanding of gene regulation, cellular diversity, and their roles in health and disease.

这篇综述介绍了不断发展的 N6-甲基腺苷(m6A)研究方法,强调了先进技术对理解 RNA 表观遗传学的重要性。从 m6A 的基本原理和对高通量方法的需求开始,研究从低通量方法发展到高通量技术,包括抗体依赖和无抗体测序方法,以及基于纳米孔的直接 mRNA 测序和 m6A 检测计算方法。此外,还介绍了 m6A 的空间技术和成像工具。对其特殊应用的讨论强调了绝对定量、单核苷酸分辨率、单分子检测和单细胞剖析的生物学意义。综述最后展望了结合当前技术进行全面 m6A 测序的理想方法,这些方法有望进一步加深我们对基因调控、细胞多样性及其在健康和疾病中的作用的理解。
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引用次数: 0
Cover Picture: Isr. J. Chem. 3/2024) 封面图片Isr.J. Chem.3/2024)
IF 3.2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-04-26 DOI: 10.1002/ijch.202480301

Chemical Biology of Nucleic Acid Modifications Issue editor: Chun-Xiao Song, Guifang Jia, Seraphine Wegner, and Chengqi Yi. The cover picture highlights Chuan He's wide-ranging research contributions across chemical biology, nucleic acid chemistry, biology, and epigenetics. His work focused on understanding DNA and RNA modifications in gene regulation. His groundbreaking discovery of reversible RNA modification revealed a new mode of gene regulation by RNA alongside DNA — and protein-based epigenetic mechanisms, leading to the emergence of the epitranscriptomics field.

核酸修饰化学生物学》杂志编辑:宋春晓、贾桂芳、Seraphine Wegner 和易成琪。封面图片突出了何川在化学生物学、核酸化学、生物学和表观遗传学方面的广泛研究贡献。他的研究重点是了解基因调控中的 DNA 和 RNA 修饰。他开创性地发现了可逆的RNA修饰,揭示了RNA与基于DNA和蛋白质的表观遗传学机制并存的基因调控新模式,导致了表观转录组学领域的出现。
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引用次数: 0
Chemical Biology of Nucleic Acid Modifications – Celebrating the Groundbreaking Contributions of Chuan He 核酸修饰的化学生物学--纪念何川的开创性贡献
IF 3.2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-04-26 DOI: 10.1002/ijch.202400036
Chun-Xiao Song, Guifang Jia, Seraphine Wegner, Chengqi Yi
<p>We are excited to present this special issue of the Israel Journal of Chemistry, which is dedicated to the prestigious Wolf Prize in Chemistry 2023 awarded to Chuan He for his <i>“pioneering work elucidating the chemistry and functional consequences of RNA modification”</i>. In honor of Chuan's remarkable achievements, this special issue features contributions from a number of his past trainees, collaborators, and colleagues. Focusing on “Chemical Biology of nucleic acid modifications,” this collection underscores Chuan's pioneering work in epigenetics and epitranscriptomics, which has transformed our understanding of DNA and RNA modifications, unlocking new paths for diagnostics and treatments.<span><sup>1, 2</sup></span> We present a collection of 15 Research and Review Articles that demonstrate the wide-ranging impact of Chuan's work across chemical biology, nucleic acid chemistry, biology, epigenetics, biochemistry, and genomics.</p><p>The diverse chemical modifications in cellular DNA and RNA, as Chuan has shown, add new dimensions to gene regulation that are crucial throughout development and disease progression. Chuan has been a trailblazer in applying chemical biology tools to mapping and understanding these modifications. This special issue opens with a research article from Chuan's lab, which presents a quantitative sequencing method for 5-formylcytosine (f<sup>5</sup>C) in RNA (R. Lyu <i>et al</i>. https://doi.org/10.1002/ijch.202300111). f<sup>5</sup>C is found in human tRNA and yeast mRNA, however, its transcriptome-wide distribution in mammals remained unexplored. Chuan's lab developed f<sup>5</sup>C-seq based on pic-borane reduction to map f<sup>5</sup>C transcriptome-wide and advanced our understanding of f<sup>5</sup>C in human and mouse cells. The research paper on f<sup>5</sup>C sequencing is complemented by a review from Cheng and coworkers, summarizing recent advances in f<sup>5</sup>C detection methods through selective chemical labeling, enrichment, and sequencing (X. Wang <i>et al</i>. https://doi.org/10.1002/ijch.202300178).</p><p><i>N</i><sup>6</sup>-methyladenosine (m<sup>6</sup>A) is the most common mRNA modification in eukaryotes. Chuan's lab made a landmark discovery in 2011 by identifying the first RNA demethylase, FTO, which removes the methyl group from m<sup>6</sup>A.<span><sup>3</sup></span> This discovery unveiled the concept of reversible RNA methylation and led to the birth of the epitranscriptomics field. Today, m<sup>6</sup>A has become the most extensively studied RNA modification. Reflecting its prevalence, five articles in this issue are dedicated to m<sup>6</sup>A, including two complementary review papers offer a comprehensive look at m<sup>6</sup>A research. The review by Tang and coworkers is centered on m<sup>6</sup>A detection methods (R. Ge <i>et al</i>. ijch.202300181R1, accepted), while the review by Zhao and coworkers focuses on the biological functions of m<sup>6</sup>A in gene regulation a
Yi Chengqi 于 2005 年在土耳其中东技术大学获得学士学位。他于 2010 年在芝加哥大学获得博士学位,师从何川教授。他于2012年加入北京大学,现为北京大学生命科学学院博雅教授,并担任北京大学化学与分子工程学院联合教授。他的研究重点是RNA修饰。
{"title":"Chemical Biology of Nucleic Acid Modifications – Celebrating the Groundbreaking Contributions of Chuan He","authors":"Chun-Xiao Song,&nbsp;Guifang Jia,&nbsp;Seraphine Wegner,&nbsp;Chengqi Yi","doi":"10.1002/ijch.202400036","DOIUrl":"https://doi.org/10.1002/ijch.202400036","url":null,"abstract":"&lt;p&gt;We are excited to present this special issue of the Israel Journal of Chemistry, which is dedicated to the prestigious Wolf Prize in Chemistry 2023 awarded to Chuan He for his &lt;i&gt;“pioneering work elucidating the chemistry and functional consequences of RNA modification”&lt;/i&gt;. In honor of Chuan's remarkable achievements, this special issue features contributions from a number of his past trainees, collaborators, and colleagues. Focusing on “Chemical Biology of nucleic acid modifications,” this collection underscores Chuan's pioneering work in epigenetics and epitranscriptomics, which has transformed our understanding of DNA and RNA modifications, unlocking new paths for diagnostics and treatments.&lt;span&gt;&lt;sup&gt;1, 2&lt;/sup&gt;&lt;/span&gt; We present a collection of 15 Research and Review Articles that demonstrate the wide-ranging impact of Chuan's work across chemical biology, nucleic acid chemistry, biology, epigenetics, biochemistry, and genomics.&lt;/p&gt;&lt;p&gt;The diverse chemical modifications in cellular DNA and RNA, as Chuan has shown, add new dimensions to gene regulation that are crucial throughout development and disease progression. Chuan has been a trailblazer in applying chemical biology tools to mapping and understanding these modifications. This special issue opens with a research article from Chuan's lab, which presents a quantitative sequencing method for 5-formylcytosine (f&lt;sup&gt;5&lt;/sup&gt;C) in RNA (R. Lyu &lt;i&gt;et al&lt;/i&gt;. https://doi.org/10.1002/ijch.202300111). f&lt;sup&gt;5&lt;/sup&gt;C is found in human tRNA and yeast mRNA, however, its transcriptome-wide distribution in mammals remained unexplored. Chuan's lab developed f&lt;sup&gt;5&lt;/sup&gt;C-seq based on pic-borane reduction to map f&lt;sup&gt;5&lt;/sup&gt;C transcriptome-wide and advanced our understanding of f&lt;sup&gt;5&lt;/sup&gt;C in human and mouse cells. The research paper on f&lt;sup&gt;5&lt;/sup&gt;C sequencing is complemented by a review from Cheng and coworkers, summarizing recent advances in f&lt;sup&gt;5&lt;/sup&gt;C detection methods through selective chemical labeling, enrichment, and sequencing (X. Wang &lt;i&gt;et al&lt;/i&gt;. https://doi.org/10.1002/ijch.202300178).&lt;/p&gt;&lt;p&gt;&lt;i&gt;N&lt;/i&gt;&lt;sup&gt;6&lt;/sup&gt;-methyladenosine (m&lt;sup&gt;6&lt;/sup&gt;A) is the most common mRNA modification in eukaryotes. Chuan's lab made a landmark discovery in 2011 by identifying the first RNA demethylase, FTO, which removes the methyl group from m&lt;sup&gt;6&lt;/sup&gt;A.&lt;span&gt;&lt;sup&gt;3&lt;/sup&gt;&lt;/span&gt; This discovery unveiled the concept of reversible RNA methylation and led to the birth of the epitranscriptomics field. Today, m&lt;sup&gt;6&lt;/sup&gt;A has become the most extensively studied RNA modification. Reflecting its prevalence, five articles in this issue are dedicated to m&lt;sup&gt;6&lt;/sup&gt;A, including two complementary review papers offer a comprehensive look at m&lt;sup&gt;6&lt;/sup&gt;A research. The review by Tang and coworkers is centered on m&lt;sup&gt;6&lt;/sup&gt;A detection methods (R. Ge &lt;i&gt;et al&lt;/i&gt;. ijch.202300181R1, accepted), while the review by Zhao and coworkers focuses on the biological functions of m&lt;sup&gt;6&lt;/sup&gt;A in gene regulation a","PeriodicalId":14686,"journal":{"name":"Israel Journal of Chemistry","volume":"64 3-4","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ijch.202400036","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140648117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Advanced Sequencing Techniques to Map RNA Methylation 绘制 RNA 甲基化图谱的先进测序技术
IF 3.2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-04-26 DOI: 10.1002/ijch.202400003
Ge-Ge Song, Xiu Fan, Chun-Chun Gao, Yong-Liang Zhao, Yun-Gui Yang

RNA methylation is a crucial epigenetic modification widely present in RNA molecules, and has been demonstrated to play significant roles in diverse biological processes. Advances in detection and sequencing technologies have facilitated the identification of RNA modification-related regulatory proteins and their corresponding biological functions. In this paper, we provide a brief overview of several RNA methylation, including N6-methyladenosine(m6A), 5-methylcytidine(m5C), N1-methyladenosine(m1A), N7-methylguanosine(m7G) and N6, 2’-O-dimethyladenosine(m6Am), about their regulatory proteins, distribution patterns and biological functions, and mainly outline the advantages and limitations of the representative sequencing techniques. Finally, we discuss the technological challenges and future perspectives in RNA transcriptomic field.

RNA 甲基化是广泛存在于 RNA 分子中的一种重要的表观遗传修饰,已被证明在多种生物过程中发挥着重要作用。检测和测序技术的进步促进了 RNA 修饰相关调控蛋白及其相应生物学功能的鉴定。本文对 N6-甲基腺苷(m6A)、5-甲基胞苷(m5C)、N1-甲基腺苷(m1A)、N7-甲基鸟苷(m7G)和 N6,2'-O-二甲基腺苷(m6Am)等几种 RNA 甲基化的调控蛋白、分布模式和生物学功能进行了简要概述,并主要概述了代表性测序技术的优势和局限性。最后,我们讨论了 RNA 转录组学领域的技术挑战和未来展望。
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引用次数: 0
25 Years of Quasiperiodic Crystallography in Physical Space using the Average Unit Cell Approach 使用平均单元格方法进行物理空间准周期晶体学研究 25 年
IF 3.2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-04-22 DOI: 10.1002/ijch.202300141
J. Wolny, I. Bugański, R. Strzałka, J. Śmietańska‐Nowak, A. Wnęk
Since the discovery of quasicrystals 40 years ago, many new paradigms and methods have been introduced to crystallography. 25 years ago, a statistical method of structure and diffraction analysis of aperiodic materials was proposed and, over these years, developed to describe model and real systems. This short review paper briefly invokes the basic concepts of the method: a reference lattice and an average unit cell, but also gives an overview of its application to atomic structure and diffraction analysis of various systems. Results are briefly discussed for mathematical sequences (Fibonacci and Thue‐Morse), model quasilattices in 2D and 3D (Penrose and Ammann tiling), refinements of real decagonal and icosahedral quasicrystals, analysis of structure disorder in quasicrystals, description of modulated systems, including macromolecular biological systems, and beyond usual application in crystallography.
自 40 年前发现准晶体以来,晶体学引入了许多新的范式和方法。25 年前,人们提出了对非周期性材料进行结构和衍射分析的统计方法。这篇简短的综述论文简要引用了该方法的基本概念:参考晶格和平均单胞,还概述了该方法在原子结构和各种系统的衍射分析中的应用。本文简要讨论了数学序列(斐波纳契和图-莫斯)、二维和三维模型准晶格(彭罗斯和安曼平铺)、实际十边形和二十面体准晶体的细化、准晶体结构紊乱分析、调制系统(包括大分子生物系统)描述以及晶体学常规应用之外的其他结果。
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引用次数: 0
N6-Methyladenosine in Mammalian Messenger RNA: Function, Location, and Quantitation 哺乳动物信使 RNA 中的 N6-甲基腺苷:功能、位置和定量
IF 3.2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-04-15 DOI: 10.1002/ijch.202300181
Ruiqi Ge, Mengshu Emily He, Weixin Tang

N6-methyladenosine (m6A) is the most abundant internal modification in mammalian messenger RNA (mRNA), constituting 0.1 %–0.4 % of total adenosine residues in the transcriptome. m6A regulates mRNA stability and translation, pre-mRNA splicing, miRNA biogenesis, lncRNA binding, and many other physiological and pathological processes. While the majority of m6As occur in a consensus motif of DRm6ACH (D=A/G/U, R=A/G, H=U/A/C), the presence of such a motif does not guarantee methylation. Different RNA copies transcribed from the same gene may be methylated to varying levels. Within a single transcript, m6As are not evenly distributed, showing an enrichment in long internal and terminal exons. These characteristics of m6A deposition call for sequencing methods that not only pinpoint m6A sites at base resolution, but also quantitate the abundance of methylation across different RNA copies. In this review, we summarize existing m6A profiling methods, with an emphasis on next generation sequencing-(NGS−)based, site-specific, and quantitative methods, as well as several emerging single-cell methods.

76 有趣的是,在急性髓性白血病(AML)66、87 以及后来的其他各种癌细胞88 中,研究表明 IGF2BPs(也是 m6A 结合蛋白)能稳定与之相互作用的 mRNA、1.3 m6Am6A 的生理和病理影响 m6Am6A 通过调节 mRNA 的稳定性和加工过程,密切参与生理和病理过程。它形成了转录下游的另一层调控,由转录因子/染色质状态进行编程--与 mRNA 分子相关的基因产物既可以通过 YTHDF2 介导的降解进行下调,也可以通过 YTHDF1,3 介导的翻译启动和 IGF2BPs 介导的稳定进行上调。例如,母体 mRNA 清除是激活子代基因以促进母体向子代过渡所必需的。89 这一过程被发现是 m6A 依赖性的,因为小鼠90 和斑马鱼91 的 Ythdf2 基因敲除(KO)都会导致发育停滞。92-94 类似的机制也存在于斑马鱼造血干细胞(HSC)发育过程中内皮细胞向造血细胞的转变95、98 最近的一项研究表明,与常染色体基因的转录本相比,X 染色体基因的转录本在早期发育阶段会消耗 m6A,从而延长其半衰期,补偿因 X 染色体失活而丧失的基因表达。75m6A 还被发现调控免疫。免疫细胞在成年生物体内继续增殖和分化,以实现免疫反应的成熟和激活。这些过程涉及大规模的转录组和表观基因组重塑,包括表转录组(尤其是 m6A)的共同调控。例如,巨噬细胞可通过 I 型和 II 型细胞因子的信号分别极化为促炎 M1 或抗炎 M2 亚型。小鼠骨髓衍生巨噬细胞(BMDMs)中的 Mettl3 KD 能显著抑制 M1 极化,同时增强 M2 极化。在适应性免疫方面,Mettl3 条件性基因敲除(cKO)通过稳定细胞因子信号转导抑制因子(SOCS)家族基因的 mRNA,阻碍了幼稚 T 细胞的发育。101 一些 RNA 病毒和逆转录病毒,如 SARS-COV-2102 和 HIV-1103 的基因组 RNA 中含有 m6A。一项获得诺贝尔奖的研究104 发现,这些 m6A 位点(以及其他 RNA 修饰,如假尿苷等)会抑制 Toll 样受体(TLR)介导的针对外源 RNA 的先天免疫反应,从而促进病毒感染。在急性髓细胞性白血病中,METTL3、METTL14、METTL16、FTO、ALKBH5、YTHDF2 和 IGF2BP2 都会过度表达。105 这些上调事件通过两个依赖 m6A 的调控途径协调原癌基因 MYC 的过度表达:1.FTO 会消耗 MYC mRNA 前两个外显子中的 m6A,YTHDF2 与之结合促进降解;2.METTL3/14 会优先增加最后一个外显子中的 m6A,IGF2BP2 与之结合稳定 m6A。除了在免疫方面的功能影响外,m6A 还参与了抗肿瘤免疫和肿瘤微环境(TMEs)的调控。转化生长因子(TGF)-β 是一种富含 TME 的细胞因子,它能下调自然杀伤(NK)细胞中的 METTL3。这种 METTL3 的缺乏会降低 Src 同源区域 2 结构域含磷酸酶-2(SHP-2)转录本上的 m6A 水平,导致其翻译减少。108 从治疗的角度来看,研究人员已经开发出 METTL3 抑制剂 STM2457,它可以阻止急性髓细胞性白血病在体外和体内的扩展。
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引用次数: 0
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Israel Journal of Chemistry
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