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Arabidopsis thaliana

ABSTRACT: Studies on the small compound HG that enhances hypocotyl growth in Arabidopsis thaliana.

PROVIDER: PRJDB15565 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	DRR454412.fastq.gz	Fastqsanger.gz
	DRR454413.fastq.gz	Fastqsanger.gz
	DRR454414.fastq.gz	Fastqsanger.gz
	DRR454415.fastq.gz	Fastqsanger.gz
	DRR454416.fastq.gz	Fastqsanger.gz

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The novel chemical growth regulator ‘Heatin’ stimulates thermomorphogenesis by inhibiting the Arabidopsis thaliana NIT1-subfamily of nitrilases

Project description:Temperature passively affects many biological processes. It is therefore challenging to study dedicated temperature signalling pathways orchestrating plant thermomorphogenesis, a suite of elongation growth-based adaptations that enhance leaf cooling capacity. We screened a chemical library for compounds that restored abolished hypocotyl elongation in the pif4-2 deficient mutant background in the model plant Arabidopsis thaliana to identify novel regulators of thermomorphogenesis. The small aromatic compound ‘Heatin’, with 1-aminomethyl-2-naphthol as minimal active moiety, was isolated as potent enhancer of elongation growth. Following a chemical proteomics approach, the NITRILASE1-subfamily auxin biosynthesis enzymes were identified as molecular targets of Heatin. We show that Heatin inhibits NIT1-subfamily enzymatic activity and that accumulation of its substrate indole-3-acetonitrile (IAN) is sufficient for elongation growth in a NIT1-subfamily-dependent manner. Our work assigns a role for NITRILASE1-subfamily in mediating elongation growth. Moreover, Heatin and its functional analogues present novel chemical entities for understanding auxin biology.

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Project description:Temperature passively affects many biological processes. It is therefore challenging to study dedicated temperature signalling pathways orchestrating plant thermomorphogenesis; a suite of elongation growth-based adaptations that enhance leaf cooling capacity. Following a chemical genetics approach, we screened a chemical library for compounds that restored abolished hypocotyl elongation in the pif4-2 deficient mutant background in the model plant Arabidopsis thaliana. The small aromatic compound ‘Heatin' (N'-[(2-hydroxy-1-naphthyl)methylene]-2-(1-naphthylamino)propanohydrazide), with 1-aminomethyl-2-naphthol, as minimal active moiety, was isolated as potent enhancer of elongation growth. Here we assessed the transcriptomic changes induced by the compound, by supplementing the MS-agar growth medium with Heatin compared to DMSO solvent, in whole seedlings of the Col-0 wild type background in control (22oC) and high ambient temperature conditions (27oC).

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