期刊
GENETICS AND MOLECULAR BIOLOGY
卷 45, 期 3, 页码 -出版社
SOC BRASIL GENETICA
DOI: 10.1590/1678-4685-GMB-2022-0137
关键词
Circadian clock; circadian rhythms; pseudo-response regulators; core oscillator; gene evolution
资金
- Sao Paulo Research Foundation (FAPESP) [19/08534-0]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [19/08534-0] Funding Source: FAPESP
Pseudo-response proteins (PRRs) are a crucial gene family for rhythm generation by the circadian clock. They play roles in the core oscillator, input pathways, and output pathways of the circadian clock system. PRR genes exhibit diversity across plant species, and their protein-protein interactions are essential for their multiple roles in the circadian clock.
PSEUDO-RESPONSE PROTEINS (PRRs) are a gene family vital for the generation of rhythms by the circadian clock. Plants have circadian clocks, or circadian oscillators, to adapt to a rhythmic environment. The circadian clock system can be divided into three parts: the core oscillator, the input pathways, and the output pathways. The PRRs have a role in all three parts. These nuclear proteins have an N-terminal pseudo receiver domain and a C-terminal CONSTANS, CONSTANS-LIKE, and TOC1 (CCT) domain. The PRRs can be identified from green algae to monocots, ranging from one to >5 genes per species. Arabidopsis thaliana, for example, has five genes: PRR9, PRR7, PRR5, PRR3 and TOC1/PRR1. The PRR genes can be divided into three clades using protein homology: TOC1/PRR1, PRR7/3, and PRR9/5 expanded independently in eudicots and monocots. The PRRs can make protein complexes and bind to DNA, and the wide variety of protein-protein interactions are essential for the multiple roles in the circadian clock. In this review, the history of PRR research is briefly recapitulated, and the diversity of PRR genes in green and recent works about their role in the circadian clock are discussed.
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