Identification of an Exopolysaccharide Biosynthesis Gene in Bradyrhizobium diazoefficiens USDA110.

Identification of an Exopolysaccharide Biosynthesis Gene in Bradyrhizobium diazoefficiens USDA110.
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重氮慢生根瘤菌 USDA110 胞外多糖生物合成基因的鉴定

DOI:
10.3390/microorganisms9122490
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发表时间:
2021-12-01
期刊:
影响因子:
4.5
通讯作者:
Dai W
Dai W
中科院分区:
生物学3区
文献类型:
--
作者:
Xu C;Ruan H;Cai W;Staehelin C;Dai W

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胞外多糖(EPS)在根瘤菌-植物相互作用中起着重要作用。然而,重氮慢生根瘤菌USDA 110中的EPS生物合成途径仍然难以捉摸。在这里,我们使用转座子(Tn)突变,旨在鉴定B中EPS生物合成所需的遗传元件。diazoefficiens USDA 110.在琼脂平板上生长的Tn 5插入突变体的表型筛选导致在blr 2358基因中具有转座子插入位点的突变体的鉴定。该基因被预测为编码将磷酸糖转移到聚戊烯醇磷酸底物上的磷酸糖基转移酶。blr 2358基因的破坏导致EPS合成缺陷。因此,blr 2358突变体显示出诱导根瘤和刺激大豆植物生长的能力降低。与blr 2358相关的糖基转移酶基因被发现是非常保守的,并且广泛分布于慢生根瘤菌属的菌株中。总之,我们的研究鉴定了参与EPS生物合成的基因,并强调了EPS在USDA 110和大豆之间共生相互作用中的重要性。
Exopolysaccharides (EPS) play critical roles in rhizobium-plant interactions. However, the EPS biosynthesis pathway in Bradyrhizobium diazoefficiens USDA110 remains elusive. Here we used transposon (Tn) mutagenesis with the aim to identify genetic elements required for EPS biosynthesis in B. diazoefficiens USDA110. Phenotypic screening of Tn5 insertion mutants grown on agar plates led to the identification of a mutant with a transposon insertion site in the blr2358 gene. This gene is predicted to encode a phosphor-glycosyltransferase that transfers a phosphosugar onto a polyprenol phosphate substrate. The disruption of the blr2358 gene resulted in defective EPS synthesis. Accordingly, the blr2358 mutant showed a reduced capacity to induce nodules and stimulate the growth of soybean plants. Glycosyltransferase genes related to blr2358 were found to be well conserved and widely distributed among strains of the Bradyrhizobium genus. In conclusion, our study resulted in identification of a gene involved in EPS biosynthesis and highlights the importance of EPS in the symbiotic interaction between USDA110 and soybeans.
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