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首页> 外文期刊>Journal of bacteriology >Exopolysaccharides from Sinorhizobium meliloti Can Protect against H2O2-Dependent Damage
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Exopolysaccharides from Sinorhizobium meliloti Can Protect against H2O2-Dependent Damage

机译：苜蓿中华根瘤菌的胞外多糖可预防H2O2依赖性损伤

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摘要

Sinorhizobium meliloti requires exopolysaccharides in order to form a successful nitrogen-fixing symbiosis with Medicago species. Additionally, during early stages of symbiosis, S. meliloti is presented with an oxidative burst that must be overcome. Levels of production of the exopolysaccharides succinoglycan (EPS-I) and galactoglucan (EPS-II) were found to correlate positively with survival in hydrogen peroxide (H2O2). H2O2 damage is dependent on the presence of iron and is mitigated when EPS-I and EPS-II mutants are cocultured with cells expressing either exopolysaccharide. Purified EPS-I is able to decrease in vitro levels of H2O2, and this activity is specific to the symbiotically active low-molecular-weight form of EPS-I. This suggests a potential protective function of exopolysaccharides against H2O2 during early symbiosis.
机译：苜蓿中华根瘤菌需要胞外多糖才能与紫花苜蓿物种成功形成固氮共生。此外，在共生的早期阶段，苜蓿链球菌出现了必须克服的氧化爆发。发现胞外多糖琥珀聚糖（EPS-I）和半乳糖葡聚糖（EPS-II）的生产水平与过氧化氢（H 2 O 2 ）中的存活成正相关。 H 2 O 2 的损伤取决于铁的存在，当EPS-1和EPS-II突变体与表达两种胞外多糖的细胞共培养时，H 2 O 2 的损害会减轻。纯化的EPS-1能够降低H 2 O 2 的体外水平，并且该活性对共生活性低分子具有特异性重量形式的EPS-I。这表明在早期共生过程中胞外多糖对H 2 O 2 的潜在保护作用。

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