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首页> 外文期刊>Current Microbiology: An International Journal >The expression and diversity of catalases in isolates of genus Comamonas in response to the oxidative stress of a polluted environment
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The expression and diversity of catalases in isolates of genus Comamonas in response to the oxidative stress of a polluted environment

机译:响应污染环境中氧化应激的Comamonas分离株中过氧化氢酶的表达和多样性

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摘要

We have evaluated the role of monofunctional heme-containing catalase encoded by cat-1 gene from the soil bacterium Comamonas terrigena N3H in the response to various forms of oxidative stress. Our results indicate that this constitutively expressed catalase represents the major source for the defence of Comamonas terrigena cells against toxic peroxides but the cells can express also a second form of catalase that is bigger and its regulation is probably more complicated. The sequence analysis confirmed the presence of highly conserved catalase sequence motifs in two environmental strains of Comamonas terrigena but in those strains that were not exposed to oxidative stress, no such sequence motif could be detected. The results obtained underline the importance of catalase expression in the defence mechanism against oxidative stress in bacterial cells.
机译:我们已经评估了土壤细菌Comamonas terrigena N3H的cat-1基因编码的含单功能血红素的过氧化氢酶在对各种形式的氧化胁迫的响应中的作用。我们的结果表明,这种组成性表达的过氧化氢酶代表着Comomonas terrigena细胞对有毒过氧化物的防御作用的主要来源,但是细胞也可以表达第二种过氧化氢酶,这种过氧化氢酶更大并且其调控可能更复杂。序列分析证实了在两个环境上的Comamonas terrigena菌株中存在高度保守的过氧化氢酶序列基序,但在那些未暴露于氧化应激的菌株中,未检测到此类序列基序。获得的结果强调了过氧化氢酶表达在防御细菌细胞氧化应激的防御机制中的重要性。

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