在斑马鱼胚胎中具有功能性
Wes Brown1, Jason D Galpin2, Carolyn Rosenblum1
1Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States.
Journal of the American Chemical Society
|January 20, 2023
概括
化学化tRNA使斑马鱼中非自然氨基酸的特定部位结合成为可能. 这种方法克服了工程合成酶的局限性,允许光化胺用于光学酶控制.
科学领域:
- 生物化学
- 分子生物学
- 发育生物学
背景情况:
- 基因代码扩展使得非正规氨基酸的蛋白质可以产生.
- 工程氨基酸tRNA合成酶是新型氨基酸的关键.
- 合成酶容纳大型或复杂的非自然氨基酸侧链存在限制.
研究的目的:
- 在斑马鱼胚胎中建立特定地点非自然氨基酸结合的强有力的方法.
- 克服工程合成酶在适应特定非自然氨基酸方面的局限性.
- 使用光氨基酸在体内显示酶活性的光学控制.
主要方法:
- 利用tRNA的化学化进行特定部位的非自然氨基酸结合.
- 在人类健康的模型生物斑马鱼胚胎中应用这种方法.
- 包含一个对合成酶工程具有挑战性的光化类型.
主要成果:
- 在斑马鱼蛋白中实现了非自然氨基酸的强大和特定的结合.
- 成功结合了光化胺类同类物,克服了先前的合成酶工程挑战.
- 通过添加光化来显示斑马鱼活体胚胎中的酶活性.
结论:
- 化学tRNA化为遗传代码扩展提供了强大的替代方案,特别是对于具有挑战性的氨基酸.
- 这种方法在体内扩展了创建具有定制功能的新型蛋白质的工具包.
- 这种方法可以在复杂的模型生物体中精确地控制生物过程.
相关概念视频
01:23RNA Structure
Overview
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
02:36Transfer RNA Synthesis
One of the unique features of tRNA is the presence of modified bases. In some tRNAs, modified bases account for nearly 20% of the total bases in the molecule. Altogether, these unusual bases protect the tRNA from enzymatic degradation by RNases.
Each of these chemical modifications is carried by a specific enzyme, post-transcription. All of these enzymes have unique base and site-specificity. Methylation, the most common chemical modification, is carried by at least nine different enzymes, with...
Each of these chemical modifications is carried by a specific enzyme, post-transcription. All of these enzymes have unique base and site-specificity. Methylation, the most common chemical modification, is carried by at least nine different enzymes, with...
02:26tRNA Activation
Aminoacyl-tRNA synthetases are present in both eukaryotes and bacteria. Though eukaryotes have 20 different aminoacyl-tRNA synthetases to couple to 20 amino acids, many bacteria do not have genes for all of these aminoacyl-tRNA synthetases. Despite this, they still use all 20 amino acids to synthesize their proteins. For instance, some bacteria do not have the gene encoding the enzyme that couples glutamine with its partner tRNA. In these organisms, one enzyme adds glutamic acid to all of the...
01:19RNA Structure
The basic structure of RNA consists of a string of ribonucleotides attached by phosphodiester bonds. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA) involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three...
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA) involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three...
02:36Transfer RNA Synthesis
One of the unique features of tRNA is the presence of modified bases. In some tRNAs, modified bases account for nearly 20% of the total bases in the molecule. Altogether, these unusual bases protect the tRNA from enzymatic degradation by RNases.
Each of these chemical modifications is carried by a specific enzyme, post-transcription. All of these enzymes have unique base and site-specificity. Methylation, the most common chemical modification, is carried by at least nine different enzymes, with...
Each of these chemical modifications is carried by a specific enzyme, post-transcription. All of these enzymes have unique base and site-specificity. Methylation, the most common chemical modification, is carried by at least nine different enzymes, with...
02:26tRNA Activation
Aminoacyl-tRNA synthetases are present in both eukaryotes and bacteria. Though eukaryotes have 20 different aminoacyl-tRNA synthetases to couple to 20 amino acids, many bacteria do not have genes for all of these aminoacyl-tRNA synthetases. Despite this, they still use all 20 amino acids to synthesize their proteins. For instance, some bacteria do not have the gene encoding the enzyme that couples glutamine with its partner tRNA. In these organisms, one enzyme adds glutamic acid to all of the...