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首页> 外文期刊>Applied and Environmental Microbiology >Mimosine, a Toxin Present in Leguminous Trees (Leucaena spp.), Induces a Mimosine-Degrading Enzyme Activity in Some Rhizobium Strains
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Mimosine, a Toxin Present in Leguminous Trees (Leucaena spp.), Induces a Mimosine-Degrading Enzyme Activity in Some Rhizobium Strains

机译：含羞草是豆科树木中的一种毒素（Leucaena spp。），可在某些根瘤菌菌株中诱导含羞草降解酶的活性。

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摘要

Thirty-seven Rhizobium isolates obtained from the nodules of leguminous trees (Leucaena spp.) were selected on the basis of their ability to catabolize mimosine, a toxin found in large quantities in the seeds, foliage, and roots of plants of the genera Leucaena and Mimosa. A new medium containing mimosine as the sole source of carbon and nitrogen was used for selection. The enzymes of the mimosine catabolic pathway were inducible and were present in the soluble fraction of the cell extract of induced cells. On the basis of a comparison of the growth rates of Rhizobium strains on general carbon and nitrogen sources versus mimosine, the toxin appears to be converted mostly to biomass and carbon dioxide. Most isolates able to grow on mimosine as a source of carbon and nitrogen are also able to utilize 3-hydroxy-4-pyridone, a toxic intermediate of mimosine degradation in other organisms.
机译：从豆科树木的根瘤（Leucaena spp。）中选出的37种根瘤菌分离物是根据其分解代谢含羞草的能力而选择的。含羞草选择一种以含羞草为唯一碳和氮源的新培养基。含羞草分解代谢途径的酶是可诱导的，并存在于诱导细胞的细胞提取物的可溶性部分中。根据根瘤菌菌株在一般碳源和氮源与含羞草素上的生长速率的比较，毒素似乎主要转化为生物质和二氧化碳。大多数能够以含羞草为碳和氮源生长的分离株，也能够利用3-羟基-4-吡啶酮，这是其他生物中含羞草降解的有毒中间体。

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