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Arabidopsis bZIP19 and bZIP23 act as zinc sensors to control plant zinc status
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Arabidopsis bZIP19 and bZIP23 act as zinc sensors to control plant zinc status
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Journal Article
Arabidopsis bZIP19 and bZIP23 act as zinc sensors to control plant zinc status
2021
Overview
Zinc (Zn) is an essential micronutrient for plants and animals owing to its structural and catalytic roles in many proteins
1
. Zn deficiency affects around 2 billion people, mainly those who live on plant-based diets relying on crops from Zn-deficient soils
2
,
3
. Plants maintain adequate Zn levels through tightly regulated Zn homeostasis mechanisms involving Zn uptake, distribution and storage
4
, but evidence of how they sense Zn status is lacking. Here, we use in vitro and in planta approaches to show that the
Arabidopsis thaliana
F-group bZIP transcription factors bZIP19 and bZIP23, which are the central regulators of the Zn deficiency response, function as Zn sensors by binding Zn
2+
ions to a Zn-sensor motif. Deletions or modifications of this Zn-sensor motif disrupt Zn binding, leading to a constitutive transcriptional Zn deficiency response, which causes a significant increase in plant and seed Zn accumulation. As the Zn-sensor motif is highly conserved in F-group bZIP proteins across land plants, the identification of this plant Zn sensor will promote new strategies to improve the Zn nutritional quality of plant-derived food and feed, and contribute to tackling the global Zn-deficiency health problem.
Zinc (Zn) is one of the essential micronutrients for plant growth and development, but the Zn-sensing mechanisms are poorly understood in plants. Two
Arabidopsis
bZIP transcription factors were previously shown to modulate plant responses to Zn deficiency. In this study, the authors find that they are indeed the sensors of Zn in
Arabidopsis
.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
/ 38/77
/ 38/90
/ 45
/ 45/44
/ 631/449
/ 631/80
/ 706/1143
/ 82
/ Basic-Leucine Zipper Transcription Factors - genetics
/ Binding
/ Biomedical and Life Sciences
/ Gene Expression Regulation, Plant
/ Letter
/ Plants, Genetically Modified - genetics
/ Plants, Genetically Modified - metabolism
/ Sensors
/ Zinc
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