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Agrobacterium tumefaciens ferritins play an important role in full virulence through regulating iron homeostasis and oxidative stress survival.
Molecular Plant Pathology ( IF 4.8 ) Pub Date : 2020-07-17 , DOI: 10.1111/mpp.12969
Jing Yang 1 , Xiaoyue Pan 1 , Yujuan Xu 1 , Yuan Li 1 , Nan Xu 1 , Zhiwei Huang 1 , Jingyang Ye 1 , Dawei Gao 1 , Minliang Guo 1
Affiliation  

Ferritins are a large family of iron storage proteins, which are used by bacteria and other organisms to avoid iron toxicity and as a safe iron source in the cytosol. Agrobacterium tumefaciens, a phytopathogen, has two ferritin‐encoding genes: atu2771 and atu2477. Atu2771 is annotated as a Bfr‐encoding gene (Bacterioferritin, Bfr) and atu2477 as a Dps‐encoding gene (DNA binding protein from starved cells, Dps). Three deletion mutants (Δbfr, Δdps, and bfrdps double‐deletion mutant ΔbdF) of these two ferritin‐encoding genes were constructed to investigate the effects of ferritin deficiency on the iron homeostasis, oxidative stress resistance, and pathogenicity of A. tumefaciens. Deficiency of two ferritins affects the growth of A. tumefaciens under iron starvation and excess. When supplied with moderate iron, the growth of A. tumefaciens is not affected by the deficiency of ferritin. Deficiency of ferritin significantly reduces iron accumulation in the cells of A. tumefaciens, but the effect of Bfr deficiency on iron accumulation is severer than Dps deficiency and the double mutant ΔbdF has the least intracellular iron content. All three ferritin‐deficient mutants showed a decreased tolerance to 3 mM H2O2 in comparison with the wild type. The tumour induced by each of three ferritin‐deficient mutants is less than that of the wild type. Complementation reversed the effects of ferritin deficiency on the growth, iron homeostasis, oxidative stress resistance, and tumorigenicity of A. tumefaciens. Therefore, ferritin plays an important role in the pathogenesis of A. tumefaciens through regulating iron homeostasis and oxidative stress survival.

中文翻译:


根癌农杆菌铁蛋白通过调节铁稳态和氧化应激生存在完全毒力中发挥重要作用。



铁蛋白是铁储存蛋白的一大家族,细菌和其他生物体利用铁蛋白来避免铁毒性,并作为细胞质中的安全铁源。根癌农杆菌是一种植物病原体,具有两个铁蛋白编码基因: atu2771atu2477Atu2771被注释为 Bfr 编码基因(细菌铁蛋白,Bfr), atu2477被注释为 Dps 编码基因(来自饥饿细胞的DNA结合蛋白,Dps)。构建了这两个铁蛋白编码基因的三个缺失突变体(Δ bfr 、Δ dpsbfr - dps双缺失突变体 ΔbdF),以研究铁蛋白缺乏对黑曲霉铁稳态、氧化应激抗性和致病性的影响。根瘤菌。两种铁蛋白的缺乏会影响铁饥饿和铁过量情况下根癌农杆菌的生长。当提供适量的铁时,根癌农杆菌的生长不会受到铁蛋白缺乏的影响。铁蛋白的缺乏显着降低了根癌土壤杆菌细胞内铁的积累,但Bfr缺乏对铁积累的影响比Dps缺乏更严重,并且双突变体ΔbdF的细胞内铁含量最少。与野生型相比,所有三种铁蛋白缺陷突变体均表现出对 3 mM H 2 O 2的耐受性降低。三种铁蛋白缺陷突变体诱导的肿瘤均小于野生型。补充逆转了铁蛋白缺乏对A.生长、铁稳态、氧化应激抵抗和致瘤性的影响。根瘤菌。因此,铁蛋白通过调节铁稳态和氧化应激生存在根癌农杆菌的发病机制中发挥着重要作用。
更新日期:2020-07-17
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