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相关概念视频

Genome Size and the Evolution of New Genes03:21

Genome Size and the Evolution of New Genes

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While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.
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The flow of genetic information in cells from DNA to mRNA to protein is described by the central dogma, which states that genes specify the sequence of mRNAs, which in turn specify the sequence of amino acids making up all proteins. The decoding of one molecule to another is performed by specific proteins and RNAs. Because the information stored in DNA is so central to cellular function, it makes intuitive sense that the cell would make mRNA copies of this information for protein synthesis...
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Overview
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The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
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The genome of most prokaryotic organisms consists of double-stranded DNA organized into one circular chromosome in a region of cytoplasm called the nucleoid. The chromosome is tightly wound, or supercoiled, for efficient storage. Prokaryotes also contain other circular pieces of DNA called plasmids. These plasmids are smaller than the chromosome and often carry genes that confer adaptive functions, such as antibiotic resistance.
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The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes. 
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Mapping Bacterial Functional Networks and Pathways in Escherichia Coli using Synthetic Genetic Arrays
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在Pseudomonas putida KT244040中的遗传密码扩展

Tianyu Gao1, Jiantao Guo2,3, Wei Niu4,5

  • 1Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE, USA.

Methods in molecular biology (Clifton, N.J.)
|March 12, 2024
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概括

研究人员开发了一种方法,通过将非正规氨基酸 (ncAAs) 纳入蛋白质,对Pseudomonas putida KT2440进行基因工程. 该技术增强了生物合成酶的分析和调节,用于生物基化学生产和生物修复.

关键词:
珀的抑制抑制珀的抑制遗传密码扩展 遗传密码扩展非正规氨基酸的氨基酸.正对角tRNA合成酶和tRNA合成酶伪omonas putida KT244040 的时间

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科学领域:

  • 微生物学 微生物学
  • 合成生物学 合成生物学
  • 生物技术是生物技术.

背景情况:

  • Pseudomonas putida KT2440 是生产生物基化学品和生物修复的关键微生物.
  • 目前分析和设计其生物合成酶的方法有限.
  • 遗传密码扩展提供了一种增强蛋白质功能和生物过程控制的方法.

研究的目的:

  • 建立一种强大的方法,将非正规氨基酸 (ncAAs) 纳入P. putida KT2440中的蛋白质中.
  • 为了能够精确控制和分析蛋白质复合体和生物合成途径.
  • 为先进的基因工程P. putida KT2440.奠定基础.

主要方法:

  • 利用遗传密码扩展将两个不同的ncAAs纳入蛋白质.
  • 采用正交的古老tRNA合成酶和tRNA对来响应UAG停止编码子.
  • 展示了使用超级文件绿色光蛋白 (sfGFP) 作为感兴趣的模型蛋白 (POI) 的方法.

主要成果:

  • 在P. putida KT2440.0中成功将两个ncAAs纳入sfGFP.
  • 建立了一个可靠的协议,用于特定站点的ncAA整合.
  • 为此目的验证了正交的古老tRNA合成酶/tRNA对的使用.

结论:

  • 开发的方法为P. putida KT2440.的先进基因工程提供了一个基础工具.
  • 这种技术有助于研究和增强P. putida.中的生物功能.
  • 能够精确地操纵蛋白质,以改善生物化学合成和生物修复应用.