From the aerialpart of Neoalsomitraintegrifoliola, eleven new dammaraneglycosides were isolated. The structures were elucidated by chemical and spectral means.
Compounds and their preparation for the treatment of Alzheimer's disease by inhibiting beta-amyloid peptide production
申请人:Landry W. Donald
公开号:US20060014729A1
公开(公告)日:2006-01-19
The present invention provides novel dammarane compounds, compositions (e.g., pharmaceutical compositions) comprising the dammarane compounds, and methods for the synthesis of these dammarane compounds. Additionally, the present invention provides methods for inhibiting beta-amyloid peptide production and methods for treating or preventing a pathological condition, particularly, neurodegeneration diseases (e.g., Alzheimer's disease), using these dammarane compounds.
Promiscuous Oxidosqualene Cyclases from <i>Neoalsomitra integrifoliola</i> Catalyzing the Formation of Tetracyclic, Pentacyclic, and Heterocyclic Triterpenes
cyclases (NiOSC1–NiOSC6) from Neoalsomitra integrifoliola were characterized for the biosynthesis of diverse triterpene scaffolds, including tetracyclic and pentacyclic triterpenesfrom the 2,3-oxidosqualene (1) and oxacyclic triterpenesfrom the 2,3:22,23-dioxidosqualene (2). NiOSC1 showed high efficiency in the production of naturally rare (20R)-epimers of oxacyclic triterpenes. Mutagenesis results revealed
来自Neoalsomitra integrifoliola的六种氧化角鲨烯环化酶 ( Ni OSC1– Ni OSC6) 被表征用于生物合成多种三萜支架,包括来自 2,3-氧化角鲨烯 ( 1 ) 的四环和五环三萜和来自 2,3:22,23 的氧杂环三萜-二氧化角鲨烯( 2 )。 Ni OSC1 在生产天然稀有的氧杂环三萜 (20 R )-差向异构体方面表现出高效率。诱变结果表明,与野生型相比, Ni OSC1-F731G 突变体显着增加了 (20 R )-差向异构体的产量。同源建模和分子对接阐明了环氧化物加成步骤中 (20 R )-构型的起源。
Betancor, Carmen; Freire, Raimundo; Hernandez, Rosendo, Journal of the Chemical Society. Perkin transactions I, 1983, p. 1119 - 1126