Pirin1 (PRN1) Is a Multifunctional Protein that Regulates Quercetin, and Impacts Specific Light and UV Responses in the Seed-to-Seedling Transition of Arabidopsis thaliana
Pirins are cupin-fold proteins, implicated in apoptosis and cellular stress in eukaryotic organisms. Pirin1 (PRN1) plays a role in seed germination and transcription of a light- and ABA-regulated gene under specific conditions in the model plant system Arabidopsis thaliana. Herein, we describe that PRN1 possesses previously unreported functions that can profoundly affect early growth, development, and stress responses. In vitro-translated PRN1 possesses quercetinase activity. When PRN1 was incubated with G-protein-α subunit (GPA1) in the inactive conformation (GDP-bound), quercetinase activity was observed. Quercetinase activity was not observed when PRN1 was incubated with GPA1 in the active form (GTP-bound). Dark-grown prn1 mutant seedlings produced more quercetin after UV (317 nm) induction, compared to levels observed in wild type (WT) seedlings. prn1 mutant seedlings survived a dose of high-energy UV (254 nm) radiation that killed WT seedlings. prn1 mutant seedlings grown for 3 days in continuous white light display disoriented hypocotyl growth compared to WT, but hypocotyls of dark-grown prn1 seedlings appeared like WT. prn1 mutant seedlings transformed with GFP constructs containing the native PRN1 promoter and full ORF (PRN1::PRN1-GFP) were restored to WT responses, in that they did not survive UV (254 nm), and there was no significant hypocotyl disorientation in response to white light. prn1 mutants transformed with PRN1::PRN1-GFP were observed by confocal microscopy, where expression in the cotyledon epidermis was largely localized to the nucleus, adjacent to the nucleus, and diffuse and punctate expression occurred within some cells. WT seedlings transformed with the 35S::PRN1-GFP construct exhibited widespread expression in the epidermis of the cotyledon, also with localization in the nucleus. PRN1 may play a critical role in cellular quercetin levels and influence light- or hormonal-directed early development.
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