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Bovine Serum Albumin

Company: Sigma-Aldrich
Catalog#: A4378
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Detection of Catalase Activity by Polyacrylamide Gel Electrophoresis (PAGE) in Cell Extracts from Pseudomonas aeruginosa
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2018-06-05
[Abstract]  Bacteria in nature and as pathogens commonly face oxidative stress which causes damage to proteins, lipids and DNA. This damage is produced by the action of reactive oxygen species (ROS) such as hydrogen peroxide (H2O2), singlet oxygen, superoxide anion and hydroxyl radical. ROS are generated by antimicrobials, environmental factors (e.g., ultraviolet radiation, osmotic stress), aerobic respiration, and host phagocytes during infective processes. Pseudomonas aeruginosa, a versatile bacterium, is a prevalent opportunistic human pathogen which possesses several defense strategies against ROS. Among them, two catalases (KatA and KatB) have been well characterized by their role on the defense against multiple types of stress. In this protocol, KatA and ... [摘要]  自然界中的细菌和病原体通常会面临氧化应激,导致蛋白质,脂质和DNA的损伤。 这种损害是由活性氧(ROS)如过氧化氢(H 2 O 2 2),单线态氧,超氧阴离子和羟基自由基的作用产生的。 ROS在感染过程中由抗菌剂,环境因素(例如,紫外线辐射,渗透压力),有氧呼吸和宿主吞噬细胞产生。 铜绿假单胞菌是一种多功能细菌,是一种普遍的机会性人类病原体,其具有针对ROS的几种防御策略。 其中,两种过氧化氢酶(KatA和KatB)在防御多种类型的压力方面的作用得到了很好的表征。 在该协议中,通过聚丙烯酰胺凝胶电泳(PAGE)检测KatA和KatB活性。 还有人认为KatB的检测是难以捉摸的。

【背景】 P上。铜绿假单胞菌是一种无处不在的细菌,它可以以游离形式在陆地和水生栖息地中发现,或作为机会性人类病原体在免疫功能低下的个体,皮肤损伤或囊性纤维化患者中引起致命性感染。为了抵御其有氧代谢产生的ROS,寄主吞噬泡和环境因素,这种微生物具有多种抗氧化策略。其中,两个单功能的过氧化氢酶(KatA和KatB)负责将H 2 O分解成水和O 2。 KatA是主要的过氧化氢酶并具有独特的特征:它对H 2 O 2抗性,渗透保护和毒力非常稳定并且是必不可少的(Hassett等人 2000; Lee等人,2005)。有人认为,KatA的稳定性是正常生长条件下高水平活性的主要因素之一,因此, ...

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