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相关概念视频

DNA Bacteriophages01:26

DNA Bacteriophages

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Bacteriophages, or phages, are viruses that specifically infect bacteria, utilizing their genetic material to hijack host cellular machinery for replication. DNA bacteriophages employ single-stranded DNA (ssDNA) or double-stranded DNA (dsDNA) genomes. These phages exhibit diverse replication strategies and host interactions, influencing their ecological roles and applications in biotechnology and medicine.ssDNA BacteriophagesssDNA phages, with their small genomes, utilize unique strategies to...
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Lytic Cycle of Bacteriophages01:30

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Bacteriophages, also known as phages, are specialized viruses that infect bacteria. A key characteristic of phages is their distinctive “head-tail” morphology. A phage begins the infection process (i.e., lytic cycle) by attaching to the outside of a bacterial cell. Attachment is accomplished via proteins in the phage tail that bind to specific receptor proteins on the outer surface of the bacterium. The tail injects the phage’s DNA genome into the bacterial cytoplasm. In the...
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Viral Replication: Lysogenic Cycle01:16

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The lysogenic cycle is a crucial viral replication strategy that allows bacteriophages to persist within host cells without immediately destroying them. This process is primarily observed in temperate phages, such as bacteriophage lambda (λ), which infects Escherichia coli. The cycle allows the viral genome to persist across bacterial generations while keeping host cells viable.Integration of the Viral GenomeUpon infection, bacteriophage lambda attaches to the bacterial surface and injects...
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Lysogenic Cycle of Bacteriophages00:43

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In contrast to the lytic cycle, phages infecting bacteria via the lysogenic cycle do not immediately kill their host cell. Instead, they combine their genome with the host genome, allowing the bacteria to replicate the phage DNA along with the bacterial genome. The incorporated copy of the phage genome is called the prophage. Some prophages can re-activate and enter the lytic cycle. This often occurs in response to a perturbation, such as DNA damage, but can also transpire in the absence of...
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Viral Replication: Lytic Cycle01:20

Viral Replication: Lytic Cycle

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Bacteriophages, or phages, are viruses that specifically infect bacteria. Among them, T-even bacteriophages, such as T4, exhibit a well-characterized lytic replication cycle in Escherichia coli (E. coli). This process ensures the rapid proliferation of the virus while ultimately leading to the destruction of the bacterial host.Attachment and DNA InjectionThe infection process begins with the recognition and binding of the T4 phage to the E. coli cell surface. Tail fibers of the phage...
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Plasmids01:28

Plasmids

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Plasmids are extrachromosomal DNA molecules found in bacteria, archaea, and some eukaryotic microbes like yeast. These small, circular DNA structures typically contain fewer than 30 genes, although some may exist linearly. Plasmids vary in their number within a cell, known as copy number. Single-copy plasmids are present in one copy per cell and multi-copy plasmids are present in multiple copies, reaching over 100 copies per cell.Plasmids usually replicate independently of the chromosomal DNA...
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相关实验视频

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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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原型的crAssphage是一种线性菌体-质粒.

Danica T Schmidtke1, Angela S Hickey2, Jakob Wirbel3

  • 1Department of Microbiology and Immunology, Stanford University, Stanford, CA, USA.

Cell host & microbe
|July 29, 2025
PubMed
概括

人类肠道病毒crAssphage (Caudovirales) 存在于菌体等质体中,在没有溶解的情况下在染色体外持续存在. 这项研究揭示了其广泛的宿主范围和双重生活方式的潜力,解释了其在肠道微生物群中的丰富性.

关键词:
细菌杆菌的发生.卡吉病毒共产体 (Carjivirus communis) 是一种病毒.福卡伊科拉 (Phocaeicola) 是一个古老的古典古典.细菌菌体是一种菌体.在Crassphage中使用.微生物基因组学 微生物基因组学微生物组是一个微生物组.菌体培养 菌体培养菌体等离子体塑料质粒 塑料质粒是什么?

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科学领域:

  • 微生物学 微生物学
  • 病毒学 病毒学
  • 人类肠道微生物组研究研究

背景情况:

  • 人类肠道病毒Crassphage (Caudovirales) 是一个无处不在的人类肠道病毒,由于其未经培养的性质,人们对其了解甚少.
  • 它的非性行为表明它具有非典型的生活方式,与典型的菌体不同.

研究的目的:

  • 描述原型crAssphage (Caudovirales) 的生活方式和宿主相互作用.
  • 调查在流行肠道细菌中的crAssphage的复制和持久机制.

主要方法:

  • 使用无斑块培养技术研究crAssphage复制.
  • 分析了体等离子体基因转录和潜在的复制起源.
  • 确定主要肠道细菌的宿主范围,包括Phocaeicola和Bacteroides物种.

主要成果:

  • 证明了crAssphage存在于线性菌体体中,保持了染色体外的持久性.
  • 鉴定了菌体和等离子体基因的转录,表明活跃的复制.
  • 揭示了广泛的宿主范围,在没有显著的溶解的情况下在Phocaeicola vulgatus,P. dorei和Bacteroides stercoris中成功复制.

结论:

  • 菌体表现出独特的双重生活方式,同时作为菌体和等离子体起作用.
  • 它在染色体外复制和在各种宿主中持久的能力有助于其在人类肠道微生物群中的流行.