Crystal structure and metal binding properties of the periplasmic iron component EfeM from Pseudomonas syringae EfeUOB/M iron-transport system.

Crystal structure and metal binding properties of the periplasmic iron component EfeM from Pseudomonas syringae EfeUOB/M iron-transport system.
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DOI:
10.1007/s10534-022-00389-2
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发表时间:
2022-06
期刊:
影响因子:
3.5
通讯作者:
Watson, Kimberly A.
Watson, Kimberly A.
中科院分区:
生物学3区
文献类型:
--
作者:
Rajasekaran, Mohan B.;Hussain, Rohanah;Siligardi, Giuliano;Andrews, Simon C.;Watson, Kimberly A.

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EfeUOB/M已在假单胞菌致病变种中表征。EfeUPsy是一种新型的铁离子转运蛋白,由一个内膜蛋白(EfeUPsy)和三个周质蛋白(EfeOPsy、EfeMPsy和EfeBPSy)组成。铁通透酶和过氧化物酶功能的作用已被确定为EfeU和EfeB蛋白,分别,但EfeO/M的作用仍不清楚。EfeMPsy是一种“仅M75”的EfeO样蛋白,具有C-末端肽酶-M75结构域(EfeOII/EfeM家族)。在此,我们报告了1.6 μ m分辨率的晶体结构的EfeMPsy,第一个结构报告的EfeM组件的P.你好该结构具有在其他细菌周质基质/溶质结合蛋白中发现的双叶结构。使用SRCD和ICP-OES的金属结合研究揭示了EfeMPsy对铜、铁和锌的偏好。这项工作提供了详细的知识的结构支架,金属网站的几何形状,和二价金属结合电位的EfeM。这项工作提供了一个更详细的了解EfeM/EfeO蛋白和肽酶M75结构域在EfeUOB/M铁吸收系统在细菌中的作用至关重要的基础。在线版本包含补充材料,可通过10.1007/s10534-022-00389-2获得。
EfeUOB/M has been characterised in Pseudomonas syringae pathovar. syringae as a novel type of ferrous-iron transporter, consisting of an inner-membrane protein (EfeUPsy) and three periplasmic proteins (EfeOPsy, EfeMPsy and EfeBPsy). The role of an iron permease and peroxidase function has been identified for the EfeU and EfeB proteins, respectively, but the role of EfeO/M remains unclear. EfeMPsy is an ‘M75-only’ EfeO-like protein with a C-terminal peptidase-M75 domain (EfeOII/EfeM family). Herein, we report the 1.6 Å resolution crystal structure of EfeMPsy, the first structural report for an EfeM component of P. syringae pv. syringae. The structure possesses the bi-lobate architecture found in other bacterial periplasmic substrate/solute binding proteins. Metal binding studies, using SRCD and ICP-OES, reveal a preference of EfeMPsy for copper, iron and zinc. This work provides detailed knowledge of the structural scaffold, the metal site geometry, and the divalent metal binding potential of EfeM. This work provides crucial underpinning for a more detailed understanding of the role of EfeM/EfeO proteins and the peptidase-M75 domains in EfeUOB/M iron uptake systems in bacteria. The online version contains supplementary material available at 10.1007/s10534-022-00389-2.
DOI: 10.1111/j.1574-6968.1987.tb02241.x
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