Peer-Reviewed Journal Details
Mandatory Fields
Margolles, A, Florez, AB, Moreno, JA, van Sinderen, D, de los Reyes-Gavilan, CG;
2006
May
Microbiology-SGM
Two Membrane Proteins From Bifidobacterium Breve Ucc2003 Constitute An Abc-Type Multidrug Transporter
Validated
()
Optional Fields
152
NA
3497
3505
Intrinsic resistance to drugs is one of the main determining factors in bacterial survival in the intestinal ecosystem. This is mediated by, among others, multidrug resistance (MDR) transporters, membrane proteins which extrude noxious compounds with very different chemical structures and cellular targets. Two genes from Bifidobacterium breve encoding hypothetical membrane proteins with a high homology with members of the ATP-binding cassette (ABC) family of muitidrug efflux transporters, were expressed separately and jointly in Lactococcus lactis. Cells co-expressing both proteins exhibited enhanced resistance levels to the antimicrobials nisin and polymyxin B. Furthermore, the drug extrusion activity in membrane vesicles was increased when both proteins were co-expressed, compared to membranes in which the proteins were produced independently. Both proteins were co-purified from the membrane as a stable complex in a 1 : 1 ratio. This is believed to be the first study of a functional ABC-type multidrug transporter in Bifidobacterium and contributes to our understanding of the molecular mechanisms underlying the capacity of intestinal bacteria to tolerate cytotoxic compounds..
DOI 10.1099/mic.0.29097-0
Grant Details