Abstract
Magnetospirillum sp. AMB-1 is a magnetic bacterium which synthesizes intracellular particles of magnetite (Fe3O4). We isolated magA gene required for the synthesis of bacterial magnetic particles (BMPs) and it encodes a polypeptide which is an iron transport protein. Intracellular localization of the MagA protein was studied using magA - luc fusion proteins. The fusion protein was also detected on the surface of the lipid bilayer covering the BMPs. One particular BMP-associated protein designated “Mps” was also isolated and characterized. The localization analysis using mps-luc fusion protein showed that there is a significant preference for the magnetosome membrane during partitioning of the Mps and the Mps protein preferentially associates with the magnetosome membrane.
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