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Deciphering the functional roles of transporter proteins in subcellular metal transportation of plants

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Abstract

Main conclusion

The role of transporters in subcellular metal transport is of great significance for plants in coping with heavy metal stress and maintaining their proper growth and development.

Abstract

Heavy metal toxicity is a serious long-term threat to plant growth and agricultural production, becoming a global environmental concern. Excessive heavy metal accumulation not only damages the biochemical and physiological functions of plants but also causes chronic health hazard to human beings through the food chain. To deal with heavy metal stress, plants have evolved a series of elaborate mechanisms, especially a variety of spatially distributed transporters, to strictly regulate heavy metal uptake and distribution. Deciphering the subcellular role of transporter proteins in controlling metal absorption, transport and separation is of great significance for understanding how plants cope with heavy metal stress and improving their adaptability to environmental changes. Hence, we herein introduce the detrimental effects of excessive common essential and non-essential heavy metals on plant growth, and describe the structural and functional characteristics of transporter family members, with a particular emphasis on their roles in maintaining heavy metal homeostasis in various organelles. Besides, we discuss the potential of controlling transporter gene expression by transgenic approaches in response to heavy metal stress. This review will be valuable to researchers and breeders for enhancing plant tolerance to heavy metal contamination.

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Data sharing not applicable to this article as no data-sets were generated or analyzed during the current study.

Abbreviations

HM:

Heavy metal

Zn:

Zinc

Mn:

Manganese

Cd:

Cadmium

Fe:

Iron

Ni:

Nickel

Cu:

Copper

Hg:

Mercury

Pb:

Lead

Co:

Cobalt

ROS:

Reactive oxygen species

MTP:

Metal tolerant protein

NRAMP:

Natural resistance-associated macrophage protein

HMA:

Heavy metal ATPase

ZIP:

Zinc-regulated, iron-regulated transporter-like protein

VIT:

Vacuolar iron transporter

YSL:

Yellow tripe-like

CDF:

Cationic diffusion facilitator

TMD:

Transmembrane domain

APC:

Amino acid-polyamine-organocation

NBD:

Nucleotide-binding domain

IRT:

Iron-regulated transporter

MBD:

Metal binding domain

H:

Helices

VTL:

Vacuolar iron transporter-like

NA:

Nicotianamine

PS:

Phytosiderophore

ZAT:

Zinc transporter of Arabidopsis

RNAi:

RNA interference

PC:

Phytochelatins

ECF:

Energy-coupling factor

IMM:

Inner membrane

OMM:

Outer membrane

MCF:

Mitochondrial carrier family

MIT:

Mitochondrial iron transporter

ATM:

ABC transporters of mitochondria

DMA:

Deoxymugineic acid

TGN:

Trans-Golgi network

dsRNA:

Double-stranded RNA

siRNA:

Small interfering RNA

References

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Funding

This work was supported by Postgraduate Research & Practice Innovation Program of Jiangsu Province (Grant No. SJCX22_1553).

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Correspondence to Xin Qi.

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The authors declare no competing interest.

Additional information

Communicated by Gerhard Leubner.

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Chen, X., Zhao, Y., Zhong, Y. et al. Deciphering the functional roles of transporter proteins in subcellular metal transportation of plants. Planta 258, 17 (2023). https://doi.org/10.1007/s00425-023-04170-8

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  • DOI: https://doi.org/10.1007/s00425-023-04170-8

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