Dataset Information

Profiling thimet oligopeptidase-mediated proteolysis in Arabidopsis thaliana

ABSTRACT: Plant stress caused by pathogens or though abiotic means (e.g. drought or temperature) reduces agricultural yields, causing substantial economic losses while reducing food security at the global level. It is critical to recognize how plants perceive stress signals to elicit responses for survival. Endogenous plant peptidases and their peptide products play an important role in the signaling of plant immune processes. Thimet oligopeptidases (TOPs) are zinc-dependent peptide hydrolases with a conserved HEXXH active site motif. These metallopeptidases are critical components in plant response to oxidative stress triggered by pathogens or abiotic factors and are required for a fully functioning immune response to certain pathogens. Further characterization of plant TOPs and their peptide substrates would provide insights into their contribution to defense signaling, stress perception, and plant adaptation pathways. Herein, a quantitative mass spectrometry-based peptidomics approach was implemented to characterize the Arabidopsis thaliana plant peptidome and in the context TOPs (Fig. 1). A comparison between wild type (Col-0) and top1top2 null mutant revealed putative direct and indirect TOPs substrates in vivo.

INSTRUMENT(S): Q Exactive HF-X

ORGANISM(S): Arabidopsis Thaliana (mouse-ear Cress)

TISSUE(S): Rosette

SUBMITTER: Leslie Hicks

LAB HEAD: Leslie Hicks

PROVIDER: PXD019928 | Pride | 2021-01-25

REPOSITORIES: Pride

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Profiling thimet oligopeptidase-mediated proteolysis in Arabidopsis thaliana.

Iannetta Anthony A AA Rogers Holden T HT Al-Mohanna Thualfeqar T O'Brien Juliana N JN Wommack Andrew J AJ Popescu Sorina C SC Hicks Leslie M LM

The Plant journal : for cell and molecular biology 20210217 2

Protein homeostasis (proteostasis) is crucial for proper cellular function, including the production of peptides with biological functions through controlled proteolysis. Proteostasis has roles in maintenance of cellular functions and plant interactions with the environment under physiological conditions. Plant stress continues to reduce agricultural yields causing substantial economic losses; thus, it is critical to understand how plants perceive stress signals to elicit responses for survival. ...[more]

PMID: 33481299

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Project description:Of all the essential nutrients, nitrogen is the one most often limiting for plant growth. Nitrogen can be taken up by plants in two ways. One possibility is through ammonium and nitrate, which are the predominate inorganic forms of nitrogen in soils. The second possibility is the uptake of air-born nitrogen through plant-associated mircoorganisms in root nodules. The majority of plants able to form such nitrogen-fixing root nodules are in the legume family Fabaceae. Here we present a third possibility M-bM-^@M-^S a new pathway, termed as nitric oxide (NO)-fixation pathway, which allows plants to fix atmospheric NO and to use it for better growth and development. We identified non-symbiotic hemoglobin class 1 (AtGLB1) and class 2 (AtGLB2) as key proteins of the NO-fixation pathway. In an NO enriched environment NO-fixation is enhanced considerably in plants overexpressing AtGLB1 or AtGLB2 genes. NO uptake resulted in four-fold higher nitrate levels in these plants compared to NO-treated wild-type plants. Correspondingly, the growth parameters like rosettes size and weight, vegetative shoot thickness and also seed yield were 25%, 40%, 30%, and 20% higher, respectively, in the overexpression lines in comparison to wild-type plants. Our results highlight the existence of a NO-fixing pathway in plants. We demonstrated that plant non-symbiotic hemoglobin proteins can fix atmospheric NO and convert it to nitrate, which is further introduced into the N-metabolism. We assume that our results might provide new insights into the field of crop science research and that the NO-fixation capability might serve as a new economically important breeding trait for enhancing biomass, fruit, and seed production. Modifying this pathway might be a promising approach for better and more environment-friendly supply of nitrogen. For example crop plant hemoglobin proteins could be improved for their NO-fixing capability and their expression levels could be increased. WT-Arabidopsis thaliana plants were fumigated with Ambient NO and 3 ppm NO air in three completely independent biological experiments. Total RNA was isolated from four-week old rosette leaves of these plants to determine the gene expression signature of each samples using Agilent one-color microarray. Differences in the gene expression signatures between Ambient NO and 3 ppm NO treated samples were analyzed to see the effect of NO fumigation on the WT Arabidopsis plants at the transcript level.

Dataset Information

Profiling thimet oligopeptidase-mediated proteolysis in Arabidopsis thaliana

Publications

Profiling thimet oligopeptidase-mediated proteolysis in Arabidopsis thaliana.

Similar Datasets

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