Cited by 324Heavy metals in environmentHeavy Metals in PlantsHeavy Metal Pollution Remediation

Identification of Thlaspi caerulescens Genes That May Be Involved in Heavy Metal Hyperaccumulation and Tolerance. Characterization of a Novel Heavy Metal Transporting ATPase

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Papoyan, Ashot, Kochian, Leon V.·2004·Plant Physiology

Abstract

Thlaspi caerulescens is a heavy metal hyperaccumulator plant species that is able to accumulate extremely high levels of zinc (Zn) and cadmium (Cd) in its shoots (30,000 μg g−1 Zn and 10,000 μg g−1 Cd), and has been the subject of intense research as a model plant to gain a better understanding of the mechanisms of heavy metal hyperaccumulation and tolerance and as a source of genes for developing plant species better suited for the phytoremediation of metal-contaminated soils. In this study, we report on the results of a yeast (Saccharomyces cerevisae) complementation screen aimed at identifying candidate heavy metal tolerance genes in T. caerulescens. A number of Thlaspi genes that conferred Cd tolerance to yeast were identified, including possible metal-binding ligands from the metallothionein gene family, and a P-type ATPase that is a member of the P1B subfamily of purported heavy metal-translocating ATPases. A detailed characterization of the Thlaspi heavy metal ATPase, TcHMA4, demonstrated that it mediates yeast metal tolerance via active efflux of a number of different heavy metals (Cd, Zn, lead [Pb], and copper [Cu]) out of the cell. However, in T. caerulescens, based on differences in tissue-specific and metal-responsive expression of this transporter compared with its homolog in Arabidopsis (Arabidopsis thaliana), we suggest that it may not be involved in metal tolerance. Instead, we hypothesize that it may play a role in xylem loading of metals and thus could be a key player in the hyperaccumulation phenotype expressed in T. caerulescens. Additionally, evidence is presented showing that the C terminus of the TcHMA4 protein, which contains numerous possible heavy metal-binding His and Cys repeats residues, participates in heavy metal binding. When partial peptides from this C-terminal domain were expressed in yeast, they conferred an extremely high level of Cd tolerance and Cd hyperaccumulation. The possibilities for enhancing the metal tolerance and phytoremediation potential of higher plants via expression of these metal-binding peptides are also discussed.

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  • RNA interference technique showed that higher expression of AhHMA4 was responsible for hypertolerance to Cd and Zn metal ions in Arabidopsis halleri.

    “Further, the RNA interference technique showed that higher expression of AhHMA4 was responsible for hypertolerance to Cd and Zn metal ions in Arabidopsis halleri (Papoyan and Kochian, 2004).”

    From Plant hyperaccumulators: a state-of-the-art review on mechanism of heavy metal transport and sequestration (2025) · cites this paper as Papoyan and Kochian, 2004

    The Tissue-Specific Expression section reports northern analysis of TcHMA4 in Thlaspi caerulescens, and the metal-tolerance section reports TcHMA4 expression in yeast. Neither passage addresses RNA interference, AhHMA4, or Cd and Zn hypertolerance in Arabidopsis halleri; searches for those terms found no matching result in our copy. No page numbers were available. (LLM, conf=0.76)

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  1. Plant Physiology, November 2004, Vol.136, pp.3814-3823, www.plantphysiol.orgÓ 2004 American Society of Plant Biologists
  2. Downloaded from https://academic.oup.com/plphys/article/136/3/3814/6112497 by guest on 16 August 2023
  3. Plant Physiol.Vol.136, 2004 Downloaded from https://academic.oup.com/plphys/article/136/3/3814/6112497 by guest on 16 August 2023
  4. Plant Physiol.Vol.136, 2004

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Authors
Papoyan, A., & Kochian, L. V.
Affiliations
Agricultural Research Service (US)
Venue
Plant Physiology
Published
2004-11-01
Volume
136
Issue
3
Pages
3814-3823
ISSN
  • 0032-0889 (ISSN-L)
  • 1532-2548
OpenAlex
W2123745023
Cited by
322
References
23
Citations by year
2026: 2 · 2025: 7 · 2024: 9 · 2023: 9 · 2022: 13 · 2021: 14 · 2020: 12 · 2019: 8 · 2018: 12 · 2017: 16 · 2016: 15 · 2015: 12 · 2014: 15 · 2013: 22 · 2012: 16
FWCI
15.97
Type
journal article
Language
en
Open access
Locations
  • PLANT PHYSIOLOGY (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Science Foundation (0129844)
  • U.S. Department of Agriculture
Topics
  • Physical Sciences › Environmental Science › Pollution › Heavy metals in environment
  • Physical Sciences › Chemistry › Analytical Chemistry › Heavy Metals in Plants
  • Physical Sciences › Environmental Science › Water Science and Technology › Heavy Metal Pollution Remediation
Keywords
Thlaspi caerulescens, heavy metal hyperaccumulation, cadmium tolerance, zinc accumulation, P-type ATPase, metal efflux, metallothionein, metal-binding peptides, xylem loading, phytoremediation, metal tolerance genes
MeSH terms
Adenosine Triphosphatases, Amino Acid Sequence, Molecular Sequence Data, Saccharomyces cerevisiae, Gene Expression, Sequence Alignment, Genes, Plant, Sequence Homology, Amino Acid, Metals, Heavy, Organisms, Genetically Modified, Thlaspi

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