Localization and function of the yeast multidrug transporter Tpo1p

被引:62
作者
Albertsen, M [1 ]
Bellahn, I [1 ]
Krämer, R [1 ]
Waffenschmidt, S [1 ]
机构
[1] Univ Cologne, Inst Biochem, D-50674 Cologne, Germany
关键词
D O I
10.1074/jbc.M210715200
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
In Saccharomyces cerevisiae four transporters, Tpo1p-Tpo4p, all members of the major facilitator superfamily, have been shown to confer resistance to polyamines. It was suggested that they act by pumping their respective substrate into the lumen of the vacuole depending on the proton gradient generated by the VATPase. Using sucrose gradient ultracentrifugation we found that an hemagglutinin (RA)-tagged Tpo1p as well as its HA-tagged Tpo2p-4p homologues co-localize with plasma membrane markers. Because the RA-tagged Tpo1p carrier protein proved to be functional in conferring resistance to polyamines in TPO1 knockouts, a function of Tpo1p in transport of polyamines across the plasma membrane seemed to be likely. The polyamine transport activity of wild type cells was compared with the respective activity of a TPO1 knockout strain. The results obtained strongly suggest that Tpo1p is a plasma membrane-bound exporter, involved in the detoxification of excess spermidine in yeast. When studying polyamine transport of wild type cells, we furthermore found that S. cerevisiae is excreting putrescine during the fermentative growth phase.
引用
收藏
页码:12820 / 12825
页数:6
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