J Biol Chem, Vol. 274, Issue 4, 2592a-2592, January 22, 1999
Functional expression of the
multidrug resistance-associated protein in the yeast
Saccharomyces cerevisiae.
Stephan
Ruetz,
Martine
Brault,
Christina
Kast,
Charles
Hemenway,
Joseph
Heitman,
Caroline E.
Grant,
Susan P. C.
Cole,
Roger G.
Deeley, and
Philippe
Gros
We have been unable to reproduce
complementation of the yeast Saccharomyces cerevisiae ste6
mutant by the human MRP gene in 200 new yeast transformants
tested. Additional studies suggest that the original
MRP-associated mating activity was caused by contaminating
STE6 sequences that were detected by Southern blotting in
frozen vials of MRP transformants from that period. We were unable to reproduce high levels of Adriamycin and valinomycin resistance in MRP transformants of yeast strain VASY. Additional experiments suggest that MRP-mediated high level resistance to these
two drugs was associated with contamination of yeast cultures with a
multidrug-resistant microbial contaminant. Finally, we have been able
to reproducibly observe MRP-mediated drug resistance to FK506, but only
in the VASY strain (rad52, erg6) and not in the
JPY201 strain. Thus, we are retracting the above manuscript (with the
exception of MRP-mediated FK506 resistance). Please do not hesitate to
contact P. Gros (gros{at}med.mcgill.ca) should you need
additional information or wish to discuss further any aspect of this work.