Dataset Information

Structure and Function of the ZTL/FKF1/LKP2 Group Proteins in Arabidopsis.

ABSTRACT: The ZTL/FKF1/LKP2 group proteins are LOV-domain-based blue-light photoreceptors that control protein degradation by ubiquitination. These proteins were identified relatively recently and are known to be involved in the regulation of the circadian clock and photoperiodic flowering in Arabidopsis. In this review, we focus on two topics. First, we summarize the molecular mechanisms by which ZTL and FKF1 regulate these biological phenomena based on genetic and biochemical analyses. Next, we discuss the chemical properties of the ZTL family LOV domains obtained from structural, biophysical, and photochemical characterizations of the LOV domains. These two different levels of approach unveiled the molecular mechanisms by which plants utilize ZTL and FKF1 proteins to monitor light for daily and seasonal adaptation.

SUBMITTER: Zoltowski BD

PROVIDER: S-EPMC4348042 | biostudies-literature | 2014

REPOSITORIES: biostudies-literature

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Structure and Function of the ZTL/FKF1/LKP2 Group Proteins in Arabidopsis.

Zoltowski Brian D BD Imaizumi Takato T

The Enzymes 20140101

The ZTL/FKF1/LKP2 group proteins are LOV-domain-based blue-light photoreceptors that control protein degradation by ubiquitination. These proteins were identified relatively recently and are known to be involved in the regulation of the circadian clock and photoperiodic flowering in Arabidopsis. In this review, we focus on two topics. First, we summarize the molecular mechanisms by which ZTL and FKF1 regulate these biological phenomena based on genetic and biochemical analyses. Next, we discuss ...[more]

PMID: 25740721

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Project description:Dynamic regulation of chromatin structure is of fundamental importance for modulating genomic activities in higher eukaryotes. The opposing activities of Polycomb group (PcG) and trithorax group (trxG) proteins are part of a chromatin-based cellular memory system ensuring the correct expression of specific transcriptional programs at defined developmental stages. The default silencing activity of PcG proteins is counteracted by trxG proteins that activate PcG target genes and prevent PcG mediated silencing activities. Therefore, the timely expression and regulation of PcG proteins and counteracting trxG proteins is likely to be of fundamental importance for establishing cell identity. Here, we report that the chromodomain/helicase/DNA-binding domain CHD3 proteins PICKLE (PKL) and PICKLE RELATED2 (PKR2) have trxG-like functions in plants and are required for the expression of many genes that are repressed by PcG proteins. The pkl mutant could partly suppress the leaf and flower phenotype of the PcG mutant curly leaf, supporting the idea that CHD3 proteins and PcG proteins antagonistically determine cell identity in plants. The direct targets of PKL in roots include the PcG genes SWINGER and EMBRYONIC FLOWER2 that encode subunits of Polycomb repressive complexes responsible for trimethylating histone H3 at lysine 27 (H3K27me3). Similar to mutants lacking PcG proteins, lack of PKL and PKR2 caused reduced H3K27me3 levels and, therefore, increased expression of a set of PcG protein target genes in roots. Thus, PKL and PKR2 are directly required for activation of PcG protein target genes and in roots are also indirectly required for repression of PcG protein target genes. Reduced PcG protein activity can lead to cell de-differentiation and callus-like tissue formation in pkl pkr2 mutants. Thus, in contrast to mammals, where PcG proteins are required to maintain pluripotency and to prevent cell differentiation, in plants PcG proteins are required to promote cell differentiation by suppressing embryonic development.

Dataset Information

Structure and Function of the ZTL/FKF1/LKP2 Group Proteins in Arabidopsis.

Publications

Structure and Function of the ZTL/FKF1/LKP2 Group Proteins in Arabidopsis.

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