Journal article

The Clostridium perfringens TetA(P) efflux protein contains a functional variant of the Motif A region found in major facilitator superfamily transport proteins.

Trudi L Bannam, Priscilla A Johanesen, Chelsea L Salvado, Sacha JA Pidot, Kylie A Farrow, Julian I Rood

Microbiology (Reading, England) | Published : 2004


The Clostridium perfringens tetracycline resistance protein, TetA(P), is an inner-membrane protein that mediates the active efflux of tetracycline from the bacterial cell. This protein comprises 420 aa and is predicted to have 12 transmembrane domains (TMDs). Comparison of the TetA(P) amino acid sequence to that of several members of the major facilitator superfamily (MFS) identified a variant copy of the conserved Motif A. This region consists of the sequence E59xPxxxxxDxxxRK72 and is located within the putative loop joining TMDs 2 and 3 in the predicted structural model of the TetA(P) protein. To study the functional importance of the conserved residues, site-directed mutagenesis was used ..

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