Trypsin-like serine protease; Plays 2 roles; promotes magnetite nucleation/formation and activates the MamE protease (Probable). Despite its near conservation of a protease-like sequence, this is probably not a protease (Probable). Required in conjunction with MamP for proteolysis of at least MamE, itself and MamP. May transport a solute that controls MamE's protease activity. May place individual iron atoms into the magnetite lattice (Probable). In the N-terminal section; belongs to the peptidase S1C family.

Hypothetical protein; Essential for magnetosome formation. Belongs to the magnetosome MamL family.

Permease of the major facilitator superfamily; Required for correct biomineralization of the magnetosome; probably transports some form of iron. Partially functionally redundant with MamZ; Belongs to the major facilitator superfamily.

Actin-like ATPase; Protein with ATPase activity which forms dynamic cytoplasmic filaments (probably with paralog MamK-like) that organize magnetosomes into long chains running parallel to the long axis of the cell (Probable). Turnover of MamK filaments is probably promoted by MamK-like, which provides a monomer pool. Forms twisted filaments in the presence of ATP or GTP. Serves to close gaps between magnetosomes in the chain. Interaction with MCP10 is involved in controlling the response to magnetic fields, possibly by controlling flagellar rotation. Expression in E.coli yields a filam [...]

Hypothetical protein; Involved in redox-control of magnetite formation; oxidizes Fe(2+) to Fe(3+) or to mixed-valent Fe(2+)-Fe(3+) oxide minerals. May control magnetite crystal size and number (Probable). Overproduction of MamP leads to more crystals than normal during exponential growth of normal size; in stationary phase crystal numbers become wild-type.

Trypsin-like serine protease, typically periplasmic; Acts at 2 distinct steps of magnetosome formation; required for correct localization of proteins to the magnetosome while the protease activity is required for maturation of small magnetite crystals into larger, functional ones. The 2 functions are separable by mutation. Probably cleaves at least itself, MamO and MamP; cleavage requires the putative transport domain of MamO (Probable). Involved in localization of some proteins (at least MamA, MamC, MamF, MamI and MamJ) to the magnetosome.

Predicted Co/Zn/Cd cation transporters; Plays a dual, essential role in magnetosome formation; required for magnetosome vesicle formation as well as biomineralization (Probable). Probably binds and transports iron (By similarity). Requires heterodimerization with MamM for stability (By similarity); Belongs to the cation diffusion facilitator (CDF) transporter (TC 2.A.4) family.

Hypothetical protein; May play a role in controlling magnetite number and size but not in control of magnetite morphology; Belongs to the magnetosome MamR family.

Hypothetical protein; May play a role in magnetite crystal growth and size. Belongs to the magnetosome MamS family.