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FEMS Microbiol Lett. 2006 Aug;261(2):235-7.

Cellular location of polyamine transport protein PotD in Streptococcus pneumoniae.

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Department of Microbiology, University of Mississippi Medical Center, Jackson, 39216, USA.


Streptococcus pneumoniae encodes a transporter for polyamines that contributes to virulence in an animal model. The putative polyamine-binding protein, PotD, has an amino-terminal secretory peptide but no other domains known to be involved in anchoring proteins to the surface of Gram-positive bacteria. Cell fractionation and immunoblotting, along with flow cytometry, suggest that PotD is surface-exposed and anchored to the cytoplasmic membrane by a potentially novel mechanism.

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