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https://www.selleckchem.com/products/oxalacetic-acid.html These findings provided comparative information on the structure and biological activity of different burdock polysaccharides and highlighted their potential as antioxidants in functional foods.Natural [4 + 2]-cyclases catalyze concerted cycloaddition during biosynthesis of over 400 natural products reported. Microbial [4 + 2]-cyclases are structurally diverse with a broad range of substrates. Thus far, about 52 putative microbial [4 + 2]-cyclases of 13 different types have been characterized, with over 20 crystal structures. However, how these cyclases have evolved during natural product biosynthesis remains elusive. Structural and phylogenetic analyses suggest that these different types of [4 + 2]-cyclases might have diverse evolutionary origins, such as reductases, dehydratases, methyltransferases, oxidases, etc. Divergent evolution of enzyme function might have occurred in these different families. Understanding the independent evolutionary history of these cyclases would provide new insights into their catalysis mechanisms and the biocatalyst design.Lipase enzymes play a central role in biotechnology and the food industry. Diacylglyceride lipases (DAG) have received considerable attention due to their physiological significance and potential industrial usage. However, compared to the wide application of triacylglycerol (TAG) lipases, DAG lipases have a limited application due to their low thermostability and specific activity. The molecular basis of substrate specificity of DAG lipases remains elusive, making structure-guided engineering of TAG to DAG lipase difficult. Besides, the number of available DAG lipases is limited compared to TAG lipases. In the current study, we identified structural consensus motifs of DAG lipases that contribute to their DAG specificity on a structural comparison of DAG and TAG lipases. To find potential DAG lipases, sequence motifs and predicted secondary structures were us

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