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PMID:22232680

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Citation

Paik, I, Yang, S and Choi, G (2012) Phytochrome regulates translation of mRNA in the cytosol. Proc. Natl. Acad. Sci. U.S.A. 109:1335-40

Abstract

An array of photoreceptors including cryptochromes, phototropin, and phytochromes regulates various light responses in plants. Among these photoreceptors, phytochromes perceive red and far-red light by switching between two interconvertible spectral forms (Pr and Pfr). The Pfr form promotes light responses partly by destabilizing negatively acting, phytochrome-interacting basic helix-loop-helix transcription factors (PIFs), thus modulating transcription in the nucleus. The Pfr form is also present in the cytosol. However, the role of phytochromes in the cytosol is not well understood. Here we show that the Pfr form interacts with the cytosolic protein PENTA1 (PNT1) and inhibits the translation of protochlorophyllide reductase (PORA) mRNA. PNT1 possesses five C3H-type zinc finger domains and displays similarity to various RNA binding proteins including Tristetraprolin, which regulates stabilities of mRNAs such as TNF-α mRNA in humans. Consistent with its function as an RNA binding protein, PNT1 directly binds to mRNA of a key chlorophyll biosynthetic gene, protochlorophyllide reductase in vivo and inhibits the translation of PORA mRNA in the presence of phytochromes. The present results demonstrate that phytochromes transmit light signals to regulate not only transcription in the nucleus through PIFs, but also translation in the cytosol through PNT1.

Links

PubMed PMC3268310 Online version:10.1073/pnas.1109683109

Keywords

Arabidopsis/physiology; Arabidopsis Proteins/genetics; Arabidopsis Proteins/metabolism; Cluster Analysis; Cytosol/metabolism; DNA Primers/genetics; Gene Expression Regulation, Plant/genetics; Gene Expression Regulation, Plant/physiology; Luciferases; Mannosyltransferases/genetics; Mannosyltransferases/metabolism; Oxidoreductases Acting on CH-CH Group Donors/genetics; Oxidoreductases Acting on CH-CH Group Donors/metabolism; Photobleaching; Phylogeny; Phytochrome/metabolism; Phytochrome/physiology; RNA, Messenger/genetics; RNA, Messenger/metabolism; Real-Time Polymerase Chain Reaction; Reverse Transcriptase Polymerase Chain Reaction; Two-Hybrid System Techniques

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

ARATH:PHYA

involved_in

GO:0017148: negative regulation of translation

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

ARATH:C3H33

involved_in

GO:0017148: negative regulation of translation

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

ARATH:C3H33

located_in

GO:0005829: cytosol

ECO:0000314: direct assay evidence used in manual assertion

C

Seeded From UniProt

complete

ARATH:C3H33

enables

GO:0010313: phytochrome binding

ECO:0000353: physical interaction evidence used in manual assertion

AGI_LocusCode:AT2G18790

F

Seeded From UniProt

complete

ARATH:C3H33

enables

GO:0010313: phytochrome binding

ECO:0000353: physical interaction evidence used in manual assertion

AGI_LocusCode:AT1G09570

F

Seeded From UniProt

complete

ARATH:C3H33

enables

GO:0048027: mRNA 5'-UTR binding

ECO:0000353: physical interaction evidence used in manual assertion

AGI_LocusCode:AT5G54190

F

Seeded From UniProt

complete


See also

References

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