Research Progress on TZP, a Novel Key Regulator of Light Signal Transduction in Plants

doi:10.11983/CBB22076

Abstract

Abstract: TANDEM ZINC-FINGER/PLUS3 (TZP) is a recently characterized novel key component of light signal transduction in plants. Accumulating evidence indicates that TZP plays an important role in multiple processes of light-mediated plant growth and development. TZP acts as a negative regulator of blue light signaling, regulates phytochrome B (phyB)-dependent control of photoperiodic flowering, and is required for the phosphorylation of the far-red light photoreceptor phyA in vivo. Further investigation and full elucidation of the biochemical activity and regulatory mechanisms of TZP will not only provide new insights into the light signaling networks, but also facilitate the design and breeding of new crop varieties with ideal plant architecture and more efficient usage of solar energy. In this review, we systematically summarized the current understanding of the role of TZP in regulating light signaling pathways in plants, and discussed the important questions for further study on TZP functions.

Key words: TZP, light signaling, phytochrome, regulatory mechanism, biochemical function

Li Cong, Qi Lijuan, Gu Xiaofeng, Li Jigang. Research Progress on TZP, a Novel Key Regulator of Light Signal Transduction in Plants[J]. Chinese Bulletin of Botany, 2022, 57(5): 579-587.

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URL: https://www.chinbullbotany.com/EN/10.11983/CBB22076

https://www.chinbullbotany.com/EN/Y2022/V57/I5/579

Figures/Tables 2

Figure 1 Phylogenetic analyses of TANDEM ZINC-FINGER/PLUS3 (TZP) from different plant species (A) The structure of TZP protein; (B) Phylogenetic analyses of TZP from different plant species using the ZF and PLUS3 domains. The database (http://plants.ensembl.org/) accession numbers of TZP protein sequences from different plant species: Populus tomentosa (KAG6766194), Carica papaya (XP_021897044), Pistacia vera (XP_031272328), Ziziphus jujube (XP_015887831), Vitis vinifera (CBI26371), Actinidia chinensis (PSS33801), Nicotiana tabacum (XP_016434926), Punica granatum (XP_031396210), Durio zibethinus (XP_022739593), Morus notabilis (XP_024023066), Castanea mollissima (KAF3952474), Arachis hypogaea (QHO11257.1), Medicago truncatula (XP_003610789), Arabidopsis lyrata (EFH41669), A. thaliana (At5g43630), Raphanus sativus (XP_018477082), Brassica rapa (XP_009101774.1), B. napus (KAH0868982), Cucumis sativus (XP_031738237), Brachypodium distachyon (KQK10007), Hordeum vulgare (HORVU.MOREX.r3.3HG0292790), Oryza sativa (Os01g0775100), Setaria italica (KQL07205), Sorghum bicolor (KXG33485), Zea mays (Zm00001eb151720), and Fontinalis antipyretica (KAH8943079).

Figure 2 Regulatory functions of TANDEM ZINC-FINGER/PLUS3 (TZP) in light signaling In blue light, TZP negatively regulates blue light signaling by physically interacting with ZFHD10 and directly modulating the expression of growth-promoting transcriptional regulators. In addition, TZP directly interacts with phyB and modulates phyB- dependent regulation of flowering by inducing the expression of FT and CO. In far-red light, TZP not only interacts with receptor phyA and regulates phyA phosphorylation in vivo, but also promotes HY5 protein abundance by competing for binding to COP1 as another substrate. The solid arrows represent direct promotion, the dotted arrow represents indirect promotion, the T-shaped arrows represent inhibition.

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