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EfeUOB/M has been characterised in  Pseudomonas syringae  pathovar.  syringae  as a novel type of ferrous-iron transporter, consisting of an inner-membrane protein (EfeU Psy ) and three periplasmic proteins (EfeO Psy , EfeM Psy  and EfeB Psy ). 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. EfeM Psy  is an ‘M75-only’ EfeO-like protein with a C-terminal peptidase-M75 domain (EfeO II /EfeM family). Herein, we report the 1.6 Å resolution crystal structure of EfeM Psy , 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 EfeM Psy  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.

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