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Amplifying Signals via Second Messengers01:15

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Many receptor binding ligands are hydrophilic; they do not cross the cell membrane but bind to cell-surface receptors. Thus, their message must be relayed by second messengers present in the cell cytoplasm. There are several second messenger pathways, each with its own way of relaying information. For example, the G protein-coupled receptors can activate both phosphoinositol and cyclic AMP (cAMP) second messenger pathways. The phosphoinositol pathway is active when the receptor induces...
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Because many receptor binding ligands are hydrophilic, they do not cross the cell membrane and thus their message must be relayed to a second messenger on the inside. There are several second messenger pathways, each with their own way of relaying information. G-protein coupled receptors can activate both phosphoinositol and cyclic AMP (cAMP) second messenger pathways. The phosphoinositol path is active when the receptor induces phospholipase C to hydrolyze the phospholipid,...
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Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the  phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and...
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The nucleoid represents a structurally and functionally distinct region within prokaryotic cells, where the cell's DNA and associated proteins are housed. Unlike eukaryotic cells, prokaryotes lack a membrane-bound nucleus, and the nucleoid facilitates the organization and accessibility of the genetic material within this constraint. The DNA in most bacteria and archaea exists as a single, circular, double-stranded molecule that is highly compacted through supercoiling and interactions with...
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Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
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Once a ligand binds to a receptor, the signal is transmitted through the membrane and into the cytoplasm. The continuation of a signal in this manner is called signal transduction. Signal transduction only occurs with cell-surface receptors, which cannot interact with most components of the cell, such as DNA. Only internal receptors can interact directly with DNA in the nucleus to initiate protein synthesis. When a ligand binds to its receptor, conformational changes occur that affect the...
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在古生物中的假定基于核酸的第二信使.

Chris van der Does1, Frank Braun1, Hongcheng Ren1

  • 1Molecular Biology of Archaea, Institute of Biology, University of Freiburg, 79104 Freiburg, Germany.

microLife
|June 12, 2023
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概括
此摘要是机器生成的。

考古生物利用基于核酸的第二信使进行细胞信号传输,循环二-AMP和循环基酸分别在透调节和抗病毒防御中发挥了明确的作用. 需要进一步的研究来阐明其他已识别的信使的功能.

关键词:
考古学是指古物质 (archaea) 是指古物质.循环的二甲基乙烯酸.循环性橄甲酸酸.第二个信使是第二个使者.信号传输,信号传输.

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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
  • 生物化学 生物化学

背景情况:

  • 第二信使对于生命的各个领域的信号传导至关重要.
  • 基于核酸的第二信使在细菌和真核生物中具有很好的特征.
  • 古代生物也拥有基于核酸的第二信使,但它们的作用不太清楚.

研究的目的:

  • 审查和总结当前对古生物中的基于核酸的第二信使的理解.
  • 突出已知的功能,并确定需要进一步调查的领域.

主要方法:

  • 关于考古第二信使研究的文献综述.
  • 对不同古生物学类和与细菌/真核生物的第二信使系统进行比较分析.

主要成果:

  • 循环二-AMP (cd-AMP) 参与了Euryarchaea的透调节,类似于它在细菌中的作用.
  • 循环橄基酸盐是CRISPR-Cas系统的关键激活剂,用于古生物的抗病毒防御.
  • 已经确定了其他几种循环核酸和二核酸,但它们的功能和途径在很大程度上仍然未被阐明.
  • 3'-3'-cGAMP的合成酶存在于Euryarchaea中,尽管没有检测到该分子本身.
  • 细菌的第二信使周期性迪加诺辛单酸盐 (cdGMP) 和瓜诺辛多酸盐 (ppGpp/pApp) 在古生物中不存在.

结论:

  • 基于核酸的第二信使在古生物中扮演着不同的角色,包括透调节和免疫力.
  • 虽然一些信使的定义很好,但许多需要进一步的功能和通路特征.
  • 古代生物拥有独特的第二信使,在某些方面与细菌不同.