Probable methyl-accepting taxis protein. May be the receptor that senses the torque generated from the interaction between the magnetosome dipole moment and the external magnetic field (Probable). Overproduction interferes with magnetotaxis, cells respond more slowly to changes in the magnetic field; requires the MamK-interacting C-terminus of the protein. The effect of magnetic sensing is to control flagellar rotation (PubMed:20471399). Chemotactic-signal transducers respond to changes in the concentration of attractants and repellents in the environment, transduce a signal from the outside to the inside of the cell, and facilitate sensory adaptation through variation of methylation levels. Attractants increase the level of methylation while repellents decrease the level of methylation. Interacts with MamK at cell poles and septa. Found predominantly at cell poles or at septa where divison occurs. Only the C-terminus (residues 321-436) is necessary to interact with MamK; its addition to MCP25 confers the ability to interact with MamK. A double amb0994-amb0995 deletion grows normally and has wild-type magnetosomes. It fails to sense and respond to an external magnetic field, i.e. bacteria do not align to the field. This bacteria makes up to 20 cubo-octahedral magnetosomes of about 45 nm in diameter which contain membrane-bound crystals of magnetite (Fe(3)O(4)). There are over 60 methyl-accepting chemotaxis proteins in this bacterium. Belongs to the methyl-accepting chemotaxis (MCP) protein family.