基因配对促进了基因编码,催化和自由能量转导的自我组织
1Department of Biochemistry and Biophysics, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7260, USA.
Life (Basel, Switzerland)
|February 24, 2024
概括
自然的自然的自然的自然的自然.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 生命的起源 生命的起源
背景情况:
- 遗传编码的起源对于理解从生物化学转变为生命至关重要.
- 关键的挑战包括键的不稳定性和氨基酸激活和转移的缓慢速度,需要能量转换和催化反应.
- 功能性蛋白质存在于特定的序列空间区域,因此需要一个系统来发现和利用它们.
研究的目的:
- 探索遗传编码的起源及其在生命出现中的作用.
- 为了研究祖先双向编码的意想不到的后果.
- 为了更深入地了解得分函数如何驱动编码和催化反应.
主要方法:
- 对实验数据的审查,将分数函数与编码的起源联系起来.
- 对祖先双向编码及其结构影响的分析.
- 检查tRNA和氨基酸-tRNA合成酶 (AARS) 作为代码密钥的作用.
主要成果:
- 双向编码导致一种"内向外"的蛋白质折叠模式,其中二次结构对齐,但极性和非极性氨基酸反转.
- 这种逆转的结构二元性被投射到蛋白质组中.
- 评分函数,如酶特异性常数 (kcat/KM),根植于这种二元性.
结论:
- 祖先的双向编码创造了反向的结构二元性,影响了蛋白质折叠和蛋白质组.
- 这种二元性对遗传编码和催化化学反应的起源至关重要.
- 该系统涉及氨基酸行为记忆,代码键 (tRNA-AARS对) 和评分功能.
相关概念视频
Allosteric Proteins-ATCase
5.7K
Binding sites linkages can regulate a protein's function. For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...
5.7K
DNA Base Pairing
27.4K
Erwin Chargaff’s rules on DNA equivalence paved the way for the discovery of base pairing in DNA. Chargaff’s rules state that in a double-stranded DNA molecule,
27.4K
DNA as a Genetic Template
21.9K
Two structural features of the DNA molecule provide a basis for the mechanisms of heredity: the four nucleotide bases and its double-stranded nature. The Watson-Crick model of double-helical DNA structure, proposed in 1952, drew heavily upon the X-ray crystallography work of researchers Rosalind Franklin and Maurice Wilkins. Watson, Crick, and Wilkins jointly received the Nobel Prize in Physiology or Medicine for their work in 1962. Franklin was, controversially, excluded from the prize for...
21.9K
Base-pairing and DNA Repair
64.7K
64.7K
Introduction to Mechanisms of Enzyme Catalysis
8.1K
For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes...
8.1K
Compounds Essential to Human Function
5.7K
The human body is composed of cells that are fundamentally made up of several different molecules. These molecules are essential to carry out all physiological processes in the body and are broadly classified into organic and inorganic based on their chemical structures.
Inorganic Compounds Essential to Human Functioning
Inorganic compounds essential to human functioning include water, salts, acids, and bases. These compounds are inorganic, i.e., they do not have a carbon-hydrogen bond. Water...
Inorganic Compounds Essential to Human Functioning
Inorganic compounds essential to human functioning include water, salts, acids, and bases. These compounds are inorganic, i.e., they do not have a carbon-hydrogen bond. Water...
5.7K


