高通量的人类 de novo-emerged sORFs的选择,具有高折叠潜力
Margaux Aubel1, Filip Buchel2,3, Brennen Heames1
1Institute for Evolution and Biodiversity, University of Muenster, Muenster, Germany.
Genome biology and evolution
|April 10, 2024
概括
新出现的de novo蛋白质随着时间的推移而进化,结构紧性和倾向性增加. 与年轻的蛋白质相比,较老的de novo蛋白质具有更明确的结构.
科学领域:
- 基因组学就是基因组学.
- 蛋白质进化 蛋白质进化
- 结构生物学 结构生物学
背景情况:
- 新的基因来自非编码DNA,产生新的蛋白质.
- 这些de novo蛋白质通常被预测是无序的,缺乏稳定的结构.
- 关于新型蛋白质在出现和固定过程中的结构性质的实验数据很少.
研究的目的:
- 实验性地研究人类de novo蛋白质的结构性质.
- 为了确定结构性质是否根据蛋白质的年龄和紧性而有所不同.
- 探索新型蛋白质结构变化的进化影响.
主要方法:
- 创建了一个短人假定新型蛋白质库,长度和年龄各不相同.
- 使用了福斯特共振能量转移 (FRET) 和光激活细胞分类 (FACS).
- 对结构紧性和疾病倾向性进行选的蛋白质.
主要成果:
- 紧的de novo蛋白质比较短,预测障碍也较低.
- 非常紧的蛋白质显示出更多的二次结构,而不那么紧的蛋白质则具有更高的混乱.
- 较老的de novo蛋白质表现出比较年轻的蛋白质更大的紧性和结构倾向.
结论:
- 在进化过程中,新的蛋白质结构在进化过程中向更大的紧性和稳定性发展.
- 结构性质的年龄依赖性变化表明选择压力对新蛋白质起作用.
- 这些发现提供了对新基因和蛋白质形成的进化途径的见解.
相关概念视频
Genome Size and the Evolution of New Genes
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.
Leaky Scanning
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R stands for...
Multi-species Conserved Sequences
Next-generation sequencing technologies have created large genomic databases of a variety of animals and plants. Ever since the human genome project was completed, scientists studied the genome of primates, mammals, and other phylogenetically distant living beings. Such large-scale studies have provided new insights into the evolutionary relationship between organisms.
Although the genome of each species varies greatly from each other, a few sequences are highly conserved. Such conserved DNA...
Although the genome of each species varies greatly from each other, a few sequences are highly conserved. Such conserved DNA...
Gene Duplication and Divergence
The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was generated by gene duplication and divergence, indicating its critical role in evolution.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are characterized.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are characterized.
Exon Recombination
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.
Exon shuffling follows “splice frame rules.” Each exon has three reading...
Exon shuffling follows “splice frame rules.” Each exon has three reading...
Genome Size and the Evolution of New Genes
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.


