title: The plant CDF family member TgMTP1 from the Ni/Zn hyperaccumulator Thlaspi goesingense acts to enhance efflux of Zn at the plasma membrane when expressed in Saccharomyces cerevisiae.
abstract: To avoid metal toxicity, organisms have evolved mechanisms including efflux of metal ions from cells and sequestration into internal cellular compartments. Members of the ubiquitous cation diffusion facilitator (CDF) family are known to play an important role in these processes. Overexpression of the plant CDF family member metal tolerance protein 1 (MTP1) from the Ni/Zn hyperaccumulator Thlaspi goesingense (TgMTP1), in the Saccharomyces cerevisiaeDelta zinc resistance conferring (zrc)1Delta cobalt transporter (cot)1 double mutant, suppressed the Zn sensitivity of this strain. T. goesingense was found to contain several allelic variants of TgMTP1, all of which confer similar resistance to Zn in Deltazrc1Deltacot1. Similarly, MTP1 from various hyperaccumulator and non-accumulator species also confer similar resistance to Zn. Deltazrc1Deltacot1 lacks the ability to accumulate Zn in the vacuole and has lower accumulation of Zn after either long- or short-term Zn exposure. Expression of TgMTP1 in Deltazrc1Deltacot1 leads to further lowering of Zn accumulation and an increase in Zn efflux from the cells. Expression of TgMTP1 in a V-type ATPase-deficient S. cerevisiae strain also confers increased Zn resistance. In vivo and in vitro immunological staining of hemagglutinin (HA)-tagged TgMTP1::HA reveals the protein to be localized in both the S. cerevisiae vacuolar and plasma membranes. Taken together, these data are consistent with MTP1 functioning to enhance plasma membrane Zn efflux, acting to confer Zn resistance independent of the vacuole in S. cerevisiae. Transient expression in Arabidopsis thaliana protoplasts also reveals that TgMTP1::green fluorescent protein (GFP) is localized at the plasma membrane, suggesting that TgMTP1 may also enhance Zn efflux in plants.
authors.affiliation: Center for Plant Environmental Stress Physiology, Purdue University, 625 Agricultural Mall Drive, West Lafayette, IN 47907, USA.
authors.forename: Donggiun
authors.initials: D
authors.lastname: Kim
authors.forename: Jeffery L
authors.initials: JL
authors.lastname: Gustin
authors.forename: Brett
authors.initials: B
authors.lastname: Lahner
authors.forename: Michael W
authors.initials: MW
authors.lastname: Persans
authors.forename: Dongwon
authors.initials: D
authors.lastname: Baek
authors.forename: Dae-Jin
authors.initials: DJ
authors.lastname: Yun
authors.forename: David E
authors.initials: DE
authors.lastname: Salt
mesh_terms: D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000235:genetics; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism*; D027682:Cation Transport Proteins; D002462:Cell Membrane / Q000378:metabolism*; D018506:Gene Expression Regulation, Plant; D008969:Molecular Sequence Data; D008970:Molecular Weight; D009532:Nickel / Q000378:metabolism; D010940:Plant Proteins; D011523:Protoplasts / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000235:genetics* / Q000378:metabolism; D031227:Thlaspi / Q000235:genetics*; D015032:Zinc / Q000378:metabolism*
chemical_list: D002352:Carrier Proteins; D027682:Cation Transport Proteins; C434736:MTP1 protein, Thlaspi goesingense; D010940:Plant Proteins; D011993:Recombinant Fusion Proteins; D009532:Nickel; D015032:Zinc