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相关概念视频

Genomic DNA in Prokaryotes00:46

Genomic DNA in Prokaryotes

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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.
Genomic Diversity in Bacteria
Although bacterial genomes are much...
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Bacterial RNA Polymerase00:43

Bacterial RNA Polymerase

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Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
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Prokaryotic Transcriptional Activators and Repressors01:58

Prokaryotic Transcriptional Activators and Repressors

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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.
Transcription of prokaryotic...
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Prokaryotic Cells01:28

Prokaryotic Cells

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Prokaryotes are small unicellular organisms that include the domains — Archaea and Bacteria. Bacteria include many common microorganisms, such as Salmonella and E. coli, while the Archaea include extremophiles that live in harsh environments, such as volcanic springs.
Like eukaryotic cells, all prokaryotic cells are surrounded by a plasma membrane, have genetic material in the form of single, circular DNA, a cytoplasm that fills the interior of the cell, and ribosomes that synthesize...
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DNA as a Genetic Template02:05

DNA as a Genetic Template

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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...
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CRISPR and crRNAs02:53

CRISPR and crRNAs

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Bacteria and archaea are susceptible to viral infections just like eukaryotes; therefore, they have developed a unique adaptive immune system to protect themselves. Clustered regularly interspaced short palindromic repeats and CRISPR-associated proteins (CRISPR-Cas) are present in more than 45% of known bacteria and 90% of known archaea.
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...
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相关实验视频

Updated: Jun 13, 2025

Phage Phenomics: Physiological Approaches to Characterize Novel Viral Proteins
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Phage Phenomics: Physiological Approaches to Characterize Novel Viral Proteins

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细菌基因组编码的 ParMs.

Samson Ali1, Adrian Koh2, David Popp3

  • 1Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan; Institute of Molecular and Cell Biology, A*STAR (Agency for Science, Technology and Research), Biopolis, Singapore 138673, Singapore.

The Journal of biological chemistry
|June 11, 2025
PubMed
概括
此摘要是机器生成的。

研究人员在细菌中发现了染色体编码的ParM (cParM),挑战了这些蛋白质仅与等离子体相关的概念. 这些cParM的功能与等离子体ParM类似,这表明它们在细菌遗传学中发挥了更广泛的作用.

关键词:
DNA分离 DNA分离这是一个ParCMR系统.部分MM 在线观看核酸化水解是核酸的水解.塑体 塑体 塑体 是一种塑体.

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相关实验视频

Last Updated: Jun 13, 2025

Phage Phenomics: Physiological Approaches to Characterize Novel Viral Proteins
09:40

Phage Phenomics: Physiological Approaches to Characterize Novel Viral Proteins

Published on: June 11, 2015

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A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues
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科学领域:

  • 微生物学 微生物学
  • 分子生物学分子生物学
  • 遗传学 是一个遗传学.

背景情况:

  • 帕姆蛋白通常在低拷贝数的等离子体上发现,在那里它们对于稳定的等离子体遗传至关重要.
  • 生物信息分析表明,ParM基因也可以位于细菌染色体上.

研究的目的:

  • 发现和描述染色体编码的ParM蛋白质 (cParMs).
  • 研究这些cParM的功能性质和进化保存.

主要方法:

  • 细菌基因组的生物信息分析.
  • 纯化的cParM蛋白质的生物化学表征,包括线程形成和核酸解试验.
  • 对cParM保存的遗传学分析.

主要成果:

  • 从Desulfitobacterium hafniense (Dh-cParM1) 和Clostridium botulinum (Cb-cParM) 鉴定出了两个cParM并进行了鉴定.
  • 这两种cParM都表现出线索形成,核酸水解和特征性的ParM结构.
  • 在缺乏等离子体的多个Desulfitobacterium物种中保存了Dh-cParM1.
  • Cb-cParM 纤维在水解后表现出稳定性,其相关的 ParR 作为脱聚合因子.

结论:

  • 功能性,聚合的ParM蛋白可以在细菌染色体上编码.
  • 对cParM的发现表明,ParM蛋白可能在等离子体分离之外发挥作用,可能在染色体动力学或其他细胞过程中发挥作用.