A paucity of information exists concerning the mechanism(s) by which bacteria secrete siderophores into the extracellular compartment. We investigated the role of SfaA and SbnD, two major facilitator superfamily (MFS)-type efflux proteins, in the secretion of the Staphylococcus aureus siderophores staphyloferrin A (SA) and staphyloferrin B (SB), respectively. Deletion of sfaA resulted in a drastic reduction of SA secreted into the supernatant with a corresponding accumulation of SA in the cytoplasm and a significant growth defect in cells devoid of SB synthesis. In contrast, sbnD mutants showed transiently lowered levels of secreted SB, suggesting the involvement of additional efflux mechanisms. Copyright © 2015 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.
Mélissa Hannauer, Jessica R Sheldon, David E Heinrichs. Involvement of major facilitator superfamily proteins SfaA and SbnD in staphyloferrin secretion in Staphylococcus aureus. FEBS letters. 2015 Mar 12;589(6):730-7
PMID: 25680529
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