Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

3.8K
The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.
3.8K
Stability of Conjugated Dienes01:28

Stability of Conjugated Dienes

3.3K
Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
3.3K
Loss of Carboxy Group as CO2: Decarboxylation of Malonic Acid Derivatives01:35

Loss of Carboxy Group as CO2: Decarboxylation of Malonic Acid Derivatives

1.9K
Just like β-keto acids—which upon thermal decarboxylation form ketones—β-dicarboxylic acids undergo decarboxylation to generate monocarboxylic acids with the liberation of carbon dioxide.
1.9K
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

1.8K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
1.8K
The Calvin Benson Cycle01:46

The Calvin Benson Cycle

4.5K
Ribulose 1,5- bisphosphate carboxylase/oxygenase (RuBisCo) is a critical enzyme that catalyzes carbon dioxide assimilation during photosynthesis. However, it is an inefficient enzyme, having an extremely slow catalytic rate. A typical enzyme can process about a thousand molecules per second; however, RuBisCo fixes only around three-carbon dioxides per second. Photosynthetic cells compensate for this slow rate by synthesizing very high amounts of RuBisCo, making it the most abundant single...
4.5K
Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

2.0K
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
2.0K

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Promoting Microbiology Literacy and Holistic Health: IMiLI and IMiLI-SAC Perspectives on Microbes, Diet, Lifestyle and Society-A 5-Year Journey.

Microbial biotechnology·2026
Same author

Development of advanced bioinformatic profiles to improve the detection and functional understanding of fungal acid phosphatases.

Applied and environmental microbiology·2026
Same author

Automated SCAI Staging as a Novel Decision Aid in Cardiogenic Shock Management.

Journal of cardiac failure·2026
Same author

Professional Academies: The Duty to Lead.

Microbial biotechnology·2026
Same author

A Biotechnological Approach to Enzyme-Based Fertilisers: Immobilisation of Acid Phosphatases.

Microbial biotechnology·2026
Same author

Scientists' Warning to Humanity: Unnecessary Bureaucracy Is a Global Impediment to Productivity, Advancement of Human and Planetary Wellbeing, Science and Sustainability.

Microbial biotechnology·2026

相关实验视频

Updated: Jun 14, 2025

Light-driven Enzymatic Decarboxylation
09:58

Light-driven Enzymatic Decarboxylation

Published on: May 22, 2016

10.7K

一种共识设计的酸脱碳酶的表征,用于 styrene 生物合成.

Ana García-Franco1,2, Jesús de la Torre1, Patricia Godoy1

  • 1Estación Experimental del Zaidín, Consejo Superior de Investigaciones Científicas, Granada, Spain.

mBio
|May 23, 2025
PubMed
概括

工程微生物使用一种新型酶从糖中产生 styrene,为石化品提供一种可持续的替代品. 这种合成生物学方法可以显著减少能源使用和碳排放.

关键词:
伪omonas 是一个类型的.脱碳氧激酶 (decarboxylases) 是一种styrene 的生物合成.合成生物学 合成生物学

更多相关视频

A Customizable Approach for the Enzymatic Production and Purification of Diterpenoid Natural Products
07:59

A Customizable Approach for the Enzymatic Production and Purification of Diterpenoid Natural Products

Published on: October 4, 2019

9.8K
A Toolkit to Enable Hydrocarbon Conversion in Aqueous Environments
20:28

A Toolkit to Enable Hydrocarbon Conversion in Aqueous Environments

Published on: October 2, 2012

14.1K

相关实验视频

Last Updated: Jun 14, 2025

Light-driven Enzymatic Decarboxylation
09:58

Light-driven Enzymatic Decarboxylation

Published on: May 22, 2016

10.7K
A Customizable Approach for the Enzymatic Production and Purification of Diterpenoid Natural Products
07:59

A Customizable Approach for the Enzymatic Production and Purification of Diterpenoid Natural Products

Published on: October 4, 2019

9.8K
A Toolkit to Enable Hydrocarbon Conversion in Aqueous Environments
20:28

A Toolkit to Enable Hydrocarbon Conversion in Aqueous Environments

Published on: October 2, 2012

14.1K

科学领域:

  • 合成生物学 合成生物学
  • 代谢工程是代谢工程.
  • 生物催化剂是一种生物催化剂.

背景情况:

  • 芳香化合物的石化生产是能源密集型和污染.
  • 微生物生物合成提供了一种可持续的替代方案,可以减少碳排放.
  • 芳香化合物的毒性和有限的酶可用性挑战了微生物的生长.

研究的目的:

  • 设计一种微生物系统,从氨酸中生产烯.
  • 开发一种高效的生物催化剂,用于将跨酸盐脱碳化成烯.
  • 描述新型共识蛋白PSC1的特征,阐明其结构功能关系.

主要方法:

  • 用*Pseudomonas putida* DOT-T1E进行基因工程,用于 styrene 的生物合成.
  • 基于真菌酸盐脱碳酶的共识蛋白 (PSC1) 的设计和构造.
  • 生物化学表征,包括热稳定性和活性测定.
  • 进行X射线晶体学以确定PSC1.1的3D结构.

主要成果:

  • 成功的工程 *Pseudomonas putida* 为一个两步式的烯生物合成途径.
  • PSC1表现出高热稳定性和高达50°C的活性.
  • 晶体结构揭示了一个同质体结构,具有关键的疏水口袋用于基质结合.
  • 突变酶确定了关键的催化残留物 (Arg175,Glu280,Glu285),它们对于脱碳化是必不可少的.

结论:

  • 改造后的*Pseudomonas*菌株和新型PSC1酶使得微生物能够高效地生产氨酸.
  • PSC1代表了生物催化在芳香化合物合成中的重大进步.
  • 这项工作为通过合成生物学实现可持续化学生产提供了基础.