germanicol/euphorbia

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Strictly Conserved Residues in Euphorbia tirucalli β-Amyrin Cyclase: Trp612 Stabilizes Transient Cation through Cation-π Interaction and CH-π Interaction of Tyr736 with Leu734 Confers Robust Local Protein Architecture.

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The functions of Trp612, Leu734, and Tyr736 of Euphorbia tirucalli β-amyrin synthase were examined. The aliphatic variants (Ala, Val, Met) of Trp612 showed almost no activity, but the aromatic variants exhibited high activities: 12.5 % of the wild-type activity for the W612H variant, 43 % for W612F,

Effect of cation-π interactions and steric bulk on the catalytic action of oxidosqualene cyclase: a case study of Phe728 of β-amyrin synthase from Euphorbia tirucalli L.

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The function of the active-site residues of oxidosqualene cyclases (OSCs) has been presumed mainly in light of the product distribution; however, not much research has been performed into the enzymatic activity of mutated OSCs. β-Amyrin, which is widely found in the plant kingdom, is classified as

Allelopathic activity and chemical constituents of extracts from roots of Euphorbia heterophylla L.

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Euphorbia heterophylla L. is regarded as a major weed worldwide. Its high aggressiveness in agricultural environment prompted us to investigate the allelopatic activity and chemical constitution of extracts from roots of this plant. Hexane extract showed low phytotoxic activity. Methanol extract at

Cytotoxic biomonitored study of Euphorbia umbellata (Pax) Bruyns.

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BACKGROUND Euphorbia umbellata latex (sap) has normally been used in folk medicine in southern Brazil to treat different types of cancers. OBJECTIVE To carry out a biomonitored investigation of partitioned latex using in vitro assay, to identify the main mechanisms related with the action of the

[Triterpene constituents from Euphorbia nematocypha Hand-Mazz].

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Seven triterpenoids have been isolated from the roots of Euphorbia nematocypha Hand-Mazz. through chromatography on 20% AgNO3-silica gel. One of them was identified as a new compound named nematocyphol on the basis of spectral data (IR, EIMS, 1H-NMR and 13C-NMR). Its structure was deduced as IVa.

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