相关实验视频
Updated: Jul 28, 2026

15:22
Nucleoside Triphosphates - From Synthesis to Biochemical Characterization
Published on: April 3, 2014
酸盐激活在纯氨酸核酸酸化酶的基本状态
Hua Deng1, Andrew S Murkin, Vern L Schramm
1Department of Biochemistry, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, New York 10461, USA. hdeng@aecom.yu.edu
Journal of the American Chemical Society
|June 15, 2006
概括
人类纯原核酸酶 (PNP) 不同地结合酸盐和核糖-1-酸盐 (R1P). FTIR光谱学揭示了R1P的独特结合模式和水解机制,为PNP酶功能提供了洞察力.
科学领域:
- 生物化学 生物化学
- 酶学 是一种酶学.
- 频谱学是一种光谱学.
背景情况:
- 人类纯素核酸酶 (PNP) 是纯素代谢中的一个关键酶.
- 了解基质结合和催化机制对于酶功能研究至关重要.
研究的目的:
- 使用FTIR光谱学研究酸盐和核糖-1-酸盐 (R1P) 与人类PNP的结合方式.
- 为了比较酸盐的结合与没有过渡状态的类似物.
- 阐明结合R1P的水解机制及其对PNP催化的影响.
主要方法:
- 福里埃变换红外光谱法 (FTIR) 用于研究PNP结合的配体.
- 振动光谱的分析以确定结合酸盐和R1P的电子结构和键.
- 对PNP.酸盐和PNP.R1P复合物的比较.
主要成果:
- 结合酸盐存在两种不同的二离子结合模式,具有相似的亲缘关系.
- 结合的R1P也是二离子的,并经历缓慢的解成核糖和酸盐,分裂C-OP键.
- 在PNP.R1P和PNP.phosphate复合体之间,结相互作用不同,其中R1P水解可能是由酸盐扭曲引起的.
- 在PNP.PO4复合体中,有两种结合酸盐的形式表明它在解和合成中扮演了反应剂和产品的角色.
结论:
- PNP对酸盐和R1P表现出明显的结合相互作用,影响基质稳定性和反应途径.
- 结合R1P的水解涉及C-OP键裂变,反映了催化反应.
- FTIR光谱学提供了关于酶催化过程中连接体的构造变化和电子状态的宝贵见解.
相关概念视频
Phosphodiester Linkages
Overview
Phosphodiester bond forms when a phosphoric acid molecule (H3PO4) links with two hydroxyl groups (–OH) of two other molecules, forming two ester bonds. Two water molecules are released in this process. The phosphodiester bond is commonly found in nucleic acids (DNA and RNA) and plays a critical role in their structure and function.
Phosphodiester Bonds Link Nucleotides Together
DNA and RNA are polynucleotides or long chains of nucleotides that are linked together. A nucleotide is...
Phosphodiester bond forms when a phosphoric acid molecule (H3PO4) links with two hydroxyl groups (–OH) of two other molecules, forming two ester bonds. Two water molecules are released in this process. The phosphodiester bond is commonly found in nucleic acids (DNA and RNA) and plays a critical role in their structure and function.
Phosphodiester Bonds Link Nucleotides Together
DNA and RNA are polynucleotides or long chains of nucleotides that are linked together. A nucleotide is...
Phosphorylation
The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...
Protein Kinases and Phosphatases
Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
ATP Synthase: Mechanism
In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased ATP...
ATP Energy Storage and Release
ATP is a highly unstable molecule. Unless quickly used to perform work, ATP spontaneously dissociates into ADP and inorganic phosphate (Pi), and the free energy released during this process is lost as heat. The energy released by ATP hydrolysis is used to perform work inside the cell and depends on a strategy called energy coupling. Cells couple the exergonic reaction of ATP hydrolysis with endergonic reactions, allowing them to proceed.
One example of energy coupling using ATP involves a...
One example of energy coupling using ATP involves a...
Biosynthesis of Nucleic Acids
Nucleic acid biosynthesis is a fundamental biochemical process that produces the purine and pyrimidine nucleotides essential for DNA and RNA synthesis. This pathway maintains a balanced nucleotide pool, preventing imbalances that could jeopardize genetic integrity and cellular function. Given the crucial role of nucleotides, their synthesis is tightly regulated to ensure proper cellular homeostasis.Purine BiosynthesisThe biosynthesis of purine nucleotides begins with ribose-5-phosphate, a...

