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相关概念视频

Bronsted-Lowry Acids and Bases02:58

Bronsted-Lowry Acids and Bases

77.9K
The acid-base reaction class has been studied for quite some time. In 1680, Robert Boyle reported traits of acid solutions that included their ability to dissolve many substances, to change the colors of certain natural dyes, and to lose these traits after coming in contact with alkali (base) solutions. In the eighteenth century, it was recognized that acids have a sour taste, react with limestone to liberate a gaseous substance (now known to be CO2), and interact with alkalis to form neutral...
77.9K
Brønsted-Lowry Acids and Bases02:16

Brønsted-Lowry Acids and Bases

19.9K
In 1923, the Brønsted–Lowry definition of acids and bases was proposed by Johannes Brønsted and Thomas Lowry. According to this theory, a Brønsted acid is defined as a species that donates a proton in a chemical reaction and gets converted to its conjugate base. A Brønsted base is defined as a species that accepts a proton in a chemical reaction and gets converted into its conjugate acid. These transfers of protons are caused by the displacement of electrons in these...
19.9K
E1 Reaction: Kinetics and Mechanism02:46

E1 Reaction: Kinetics and Mechanism

14.5K
Here, in contrast to the E2 reaction mechanism, we delve into the aspects of the E1 reaction mechanism, which has two steps: rate-limiting loss of the leaving group and abstraction of the beta hydrogen by a weak base. Typically, the experimental proof for the E1 mechanism is via kinetic studies or isotope studies. While the former demonstrates the first-order kinetics—the dependence of the reaction solely on substrate concentration—the latter proves the abstraction of hydrogen only...
14.5K
Relative Reactivity of Carboxylic Acid Derivatives01:13

Relative Reactivity of Carboxylic Acid Derivatives

3.1K
Carboxylic acid derivatives such as acid halides, anhydrides, esters, and amides undergo nucleophilic acyl substitution reactions with varying degrees of reactivity.
A key factor in assessing the reactivity of the acid derivatives is the basicity of the substituent or the leaving group. The lower the basicity of the leaving group, the higher the reactivity of the derivative. The basicity of the leaving group follows this order:
Halide ions < Acyloxy ions < Alkoxy ions < Amine ions
3.1K
Reactivity of Enolate Ions01:23

Reactivity of Enolate Ions

2.4K
Enolate ions are formed by the acid–base reaction of a carbonyl compound with a base. This leads to deprotonation of the α hydrogen atom, leading to a resonance-stabilized enolate ion where one of the contributing structures is an oxyanion, which imparts additional stability. Therefore, the proton on the α carbon is more acidic in nature than that of other sp3-hybridized C–H bonds but less acidic than those in O–H bonds where the negative charge in the conjugate...
2.4K
Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Mechanism01:13

Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Mechanism

9.1K
Carboxylic acids react with alcohols to yield esters via an acid-catalyzed condensation reaction called Fischer esterification. This is a nucleophilic acyl substitution reaction that proceeds via a tetrahedral intermediate, where a water molecule is eliminated as the leaving group.
9.1K

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Genetically-encoded Molecular Probes to Study G Protein-coupled Receptors
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一个关于基于氨酸反应活性的探针的观点

Constantin M Nuber1, Max A Schwab2,3, David B Konrad1,2,3

  • 1Department of Pharmacy, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, 81377 Munich, Germany. david.konrad@cup.lmu.de.

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概括

基于活动的蛋白质分析 (ABPP) 使用化学探针来研究蛋白质功能和药物机制. 这一观点审查了基于质谱的化学蛋白质组学的共价氨酸向探针的设计和应用.

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科学领域:

  • 化学生物学 化学生物学
  • 蛋白质组学是指蛋白质组学.
  • 药物发现 药物发现 药物发现

背景情况:

  • 基于活动的蛋白质分析 (ABPP) 是一种关键的化学生物学技术.
  • 它可以研究蛋白质功能,标识和化学探针和药物的作用机制研究.

研究的目的:

  • 提供对共价氨酸向活动型探针 (ABP) 的概述.
  • 讨论ABPP在化学生物学和制药研究中的设计,应用和未来潜力.

主要方法:

  • ABP设计的概述,包括反应性元素 (化学型/弹头) 和功能性手柄.
  • 使用ABP进行基于质谱的化学蛋白质组学分析的描述.
  • 为活细胞应用和转化后修改研究开发先进的ABP的策略.

主要成果:

  • 定性氨酸向的ABP是化学蛋白质组学的多功能工具.
  • 先进的ABP促进了活细胞的化学蛋白质组学和对翻译后修饰的研究.
  • 对于制药行业来说,ABPP具有显著的潜力.

结论:

  • ABPP是了解蛋白质功能和药物机制的一种强有力的方法.
  • 先进的ABP的设计和应用正在扩大化学蛋白质组学的范围.
  • 进一步开发ABPP对药物发现和开发有重大影响.