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首页> 外文期刊>Journal of bacteriology >Mur Regulates the Gene Encoding the Manganese Transporter MntH in Brucella abortus 2308
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Mur Regulates the Gene Encoding the Manganese Transporter MntH in Brucella abortus 2308

机译:Mur调节流产布鲁氏菌2308中锰转运蛋白MntH的基因

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摘要

MntH is the only high-affinity manganese transporter identified in Brucella. A previous study showed that MntH is required for the wild-type virulence of Brucella abortus 2308 in mice (Anderson ES, et al., Infect. Immun. >77:3466–3474, 2009) and indicated that the mntH gene is regulated in a manganese-responsive manner in this strain by a Mur homolog. In the study presented here, the transcriptional start site for mntH in B. abortus 2308 was determined by primer extension analysis. Specific interactions between Mur and the mntH promoter region were demonstrated in an electrophoretic mobility shift assay (EMSA), and a Mur binding site was identified in the ?55 to ?24 region of the mntH promoter by DNase I footprint analysis. The specificity of the interaction of Mur with the putative Mur box was further evaluated by EMSA employing oligonucleotides in which the consensus nucleotides in this region were substituted. These studies not only confirm a direct role for Mur in the Mn-responsive regulation of mntH expression in Brucella abortus 2308 but also identify the cis-acting elements upstream of mntH that are responsible for this regulation.
机译:MntH是布鲁切拉(Brucella)中唯一鉴定出的高亲和力锰转运蛋白。先前的研究表明,MntH是小鼠流产布鲁氏菌2308的野生型毒力所必需的(Anderson ES等,Infect。Immun。> 77: 3466–3474,2009),并指出该菌株中的 mntH 基因以锰响应方式受到Mur同源物的调控。在本文介绍的研究中,通过引物延伸分析确定了流产双歧杆菌2308中 mntH 的转录起始位点。在电泳迁移率迁移分析(EMSA)中证明了Mur与 mntH 启动子区域之间的特异性相互作用,并且在 mntH <55到λ24区域鉴定了Mur结合位点。 / em>启动子通过DNase I足迹分析。通过EMSA进一步评估Mur与推定的Mur盒的相互作用的特异性,使用寡核苷酸,其中该区域中的共有核苷酸被取代。这些研究不仅证实了Mur在流产布鲁氏菌2308中的 mntH 表达的Mn响应调控中具有直接作用,而且还鉴定了上游的顺式作用元件负责此法规的mntH

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