Manganese-binding lipoprotein MntC (MntC)

Manganese-binding lipoprotein MntC is a highly conserved cell-surface protein in Staphylococcus aureus that functions as the substrate-binding component of the MntABC manganese importer system [UniProt P0A0H3]. Manganese is an essential micronutrient for S. aureus, serving as a critical cofactor for enzymes such as superoxide dismutase, which protects the bacterium from reactive oxygen species generated by the host immune system [Microbiology (2002) 148:3115-3125]. By facilitating high-affinity manganese uptake, MntC allows the pathogen to survive under the metal-restricted conditions imposed by the host during infection, a process known as nutritional immunity [J. Exp. Med. (2013) 210:403-416]. Because manganese is vital for virulence and survival within the host, MntC has been extensively studied as a potent vaccine antigen [Vaccine (2014) 32:5887-5895]. Due to its high conservation across various S. aureus strains and its accessibility on the cell surface, MntC is a primary target for vaccine development. It has been included as a key antigen in multi-component vaccine candidates, such as Pfizer's SA4Ag, designed to elicit protective immune responses against invasive staphylococcal diseases [Vaccine (2014) 32:5887-5895]. Targeting MntC aims to disrupt the bacteria's ability to scavenge essential metals or to flag the pathogen for immune clearance via opsonophagocytosis. While no MntC-targeted therapies are currently approved, it remains a high-priority target in the search for effective MRSA preventatives.

Other names

MntCManganese-binding protein MntCABC transporter manganese-binding proteinStaphylococcus aureus surface protein MntCSitA

Induction of opsonophagocytic antibodies to facilitate bacterial clearance and potential inhibition of manganese uptake.