Found in membrane microdomains that may be equivalent to eukaryotic membrane rafts (PubMed:20713508). FMMs are highly dynamic and increase in number as cells age. Flotillins are thought to be important factors in membrane fluidity (By similarity). Homooligomerizes. Present in detergent-resistant membrane (DRM) fractions, approximately 6 foci per cell. No visible effect on resistance to oxidizing agents, proton motive force-damaging agents, membrane or cell wall stress. Improved resistance to ampicillin, enhanced swimming ability. Belongs to the band 7/mec-2 family. Flotillin subfamily.