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相关概念视频

Position-effect Variegation02:32

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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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Apart from the measures of central tendency, distribution, outliers, and the changing characteristics of data with time, an important characteristic of any data set is its variation or spread. In some data sets, the data values are concentrated closely near the mean; in others, the data values are more widely spread out from the mean.
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Source transformation is a fundamental technique employed in circuit analysis, offering a valuable tool for simplifying complex electrical circuits. This technique involves the replacement of either a voltage source in series with a resistor by a current source in parallel with a resistor, or vice versa. The key concept here is that when the original sources are deactivated (turned off), the equivalent resistance at the circuit's end terminals remains the same.
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在SRC类主题上的变化.

Stephen C Harrison1

  • 1Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Children's Hospital, Howard Hughes Medical Institute, Boston, MA 02115, USA. harrison@crystal.harvard.edu

Cell
|March 26, 2003
PubMed
概括
此摘要是机器生成的。

进化有利于重复使用功能性蛋白质域组合,而不是发明新的组合. 这在不同的基因组环境中保留了分子解决方案,突出了对已建立的蛋白质架构的偏好.

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科学领域:

  • 蛋白质的架构 蛋白质的架构
  • 分子进化的分子进化.
  • 基因组学就是基因组学.

背景情况:

  • 蛋白质域表现出模块化和多样性,表明了广泛的组合可能性.
  • 进化过程似乎有利于蛋白质域的保存组合.

研究的目的:

  • 研究功能性蛋白质域组合的进化保存.
  • 了解蛋白质进化中的分子溶液的重复使用.

主要方法:

  • 在多个基因组中分析蛋白质域架构.
  • 识别具有特定功能的重复域组合.

主要成果:

  • 执行协调功能的蛋白质域的特定分组经常被保留.
  • 这些功能域组合在各种基因组背景中重新出现.
  • 已建立的分子溶液的进化再利用是一个普遍的策略.

结论:

  • 蛋白质进化以功能域组合的保守选择和再利用为特征.
  • 这种重复使用策略优化了分子解决方案,减少了重新发明的需要.
  • 了解域组合保护提供了对蛋白质进化和功能的洞察.