Abstract
Magnetotactic bacteria (MTB) can biosynthesise magnetosomes, which have great potential for commercial applications. A new MTB strain, Magnetospirillum sp. ME-1, was isolated and cultivated from freshwater sediments of East Lake (Wuhan, China) using the limiting dilution method. ME-1 had a chain of 17±4 magnetosomes in the form of cubooctahedral crystals with a shape factor of 0.89. ME-1 was closest to Magnetospirillum sp. XM-1 according to 16S rRNA gene sequence similarity. Compared with XM-1, ME-1 possessed an additional copy of mamPA and a larger mamO in magnetosome-specific genes. ME-1 had an intact citric acid cycle, and complete pathway models of ammonium assimilation and dissimilatory nitrate reduction. Potential carbon and nitrogen sources in these pathways were confirmed to be used in ME-1. Adipate was determined to be used in the fermentation medium as a new kind of dicarboxylic acid. The optimised fermentation medium was determined by orthogonal tests. The large-scale production of magnetosomes was achieved and the magnetosome yield (wet weight) reached 120 mg L-1 by fed-batch cultivation of ME-1 at 49 h in a 10-L fermenter with the optimised fermentation medium. This study may provide insights into the isolation and cultivation of other new MTB strains and the production of magnetosomes.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
