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Lipases play a crucial role in the life cycle of seed plants and the oil content of the seed is highly regulated by the lipase activity. Hence, understanding the role of lipases during germination and post-germination will provide insights into lipid mobilization. However, to date, no lipase gene has been identified in seeds except, Sugar-dependent-1 in Arabidopsis. Hence, in the present study, we employed a functional proteomic approach for the identification of seed-specific lipase. Activity-Based Proteome Profiling (ABPP) of Arabidopsis mature and germinating seeds revealed the expression of a functional serine hydrolase exclusively during germination. The mass-spectrometry analysis reveals the identity and amino acid sequence of the protein correspond to AT4G28520 gene, a canonical 12S Seed Storage Protein (SSP). Interestingly, the identified SSP was a proteoform of AT4G28520 (SL-AT4G28520) and exhibited >90% identity with the canonical AT4G28520 (FL-AT4G28520). Heterologous expression and enzyme assays indicated that SL-AT4G28520 protein indeed possesses monoacylglycerol lipase activity, while the FL-AT4G28520 protein didn't exhibit any detectable activity. Functional proteomics and lipidomics analysis demonstrated a catalytic function of this SSP. Collectively, this is the first report, which suggests that SL-AT4G28520 encodes a lipase, and the activity is depending on the physiological condition.
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