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相关概念视频

Gene Regulation During Sporulation01:17

Gene Regulation During Sporulation

Sporulation is a complex developmental process that allows certain Gram-positive bacteria, such as Bacillus subtilis and Clostridium species, to survive extreme environmental conditions. This process is tightly regulated by a series of signaling cascades and transcriptional controls, ensuring the formation of a highly resistant endospore.Sporulation is triggered by unfavorable conditions, such as nutrient depletion, and is governed by a phosphorelay system. One of the sensor kinases, such as...
Stringent Response in E. coli01:23

Stringent Response in E. coli

Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...

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相关实验视频

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The Multifaceted Benefits of Protein Co-expression in Escherichia coli
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The Multifaceted Benefits of Protein Co-expression in Escherichia coli

Published on: February 5, 2015

再组合的Streptomycescoelicolor NiSOD的表达,复制和突变

Peter A Bryngelson1, Sumonu E Arobo, Jennifer L Pinkham

  • 1Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003, USA.

Journal of the American Chemical Society
|January 15, 2004
PubMed
概括

依赖的超氧化物脱酶 (NiSODs) 提供了一种管理有害超氧化物激素的新方法. 研究表明,改变一个关键的N端胺残留物显著影响NiSOD功能,而不是改变甲胺残留物.

科学领域:

  • 生物化学 生物化学
  • 酶学 是一种酶学.
  • 金属蛋白的研究研究.

背景情况:

  • 反应性氧物种 (ROS),特别是超氧化物,会导致细胞损伤.
  • 超氧化物脱酶 (SODs) 是一种能中和超氧化物的酶.
  • 依赖性SOD (NiSOD) 是这些酶的一个独特类别.

研究的目的:

  • 为了表达和描述复合性Streptomyces coelicolor NiSOD的特征.
  • 研究特定结联体在NiSOD结构和功能中的作用.
  • 阐明NiSOD活动地点的机械和结构方面.

主要方法:

  • 这是Streptomyces coelicolor NiSOD的重组表达.
  • 酶的体外加工和复制.
  • 假定结合残留物 (M28和N-终端H) 的位点定向突变发生.
  • 野生类型和突变酶的光谱和催化性能分析.

主要成果:

  • 成功生产出完全活跃的重组NiSOD.
  • 在位置28 (M28) 的氨酸突变没有影响酶特性.
  • 在N端的histidine残留物中发生的突变极大地改变了光谱和催化功能.

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Visual and Microscopic Evaluation of Streptomyces Developmental Mutants
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  • 这些发现凸显了N端的histidine的关键作用.

    • 结论:

    • 该N端的histidine对于NiSOD的结构完整性和催化活性至关重要.
    • 氨酸28对NiSOD功能没有关键作用.
    • 这项研究为NiSODs的新含有活性部位提供了关键的见解.