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Terpenoid, Benzenoid, and Phenylpropanoid Compounds in the Floral Scent of Vanda Mimi Palmer
Ab. Rahim Mohd-Hairul,Parameswari Namasivayam,Gwendoline Ee Cheng Lian,Janna Ong Abdullah 한국식물학회 2010 Journal of Plant Biology Vol.54 No.5
Vanda Mimi Palmer is the product of a cross between Vanda Tan Chay Yan and Vanda tessellata. The flower of this hybrid produces a sweet-smelling fragrance during day time at the open-flower stage. This study aimed to investigate the floral scent constituents in Vanda Mimi Palmer. Scent emission analysis of this orchid was carried out at different time points in a 24-h cycle and also at different floral developmental stages. A comparison was also made on the volatiles emitted by Vanda Mimi Palmer and both of its parents. Gas chromatography-mass spectrometry (GC-MS) analysis showed that the scent of Vanda Mimi Palmer was dominated by terpenoid, benzenoid, and phenylpropanoid compounds. The identified terpenoids were ocimene, linalool oxide, linalool, and nerolidol;while the benzenoid and phenylpropanoid compounds were methylbenzoate, benzyl acetate, phenylethanol, and phenylethyl acetate. The emission of terpenoid, benzenoid,and phenylpropanoid compounds was developmentally and temporally regulated. Comparison of the volatiles emitted by both of its parents showed that the scent of Vanda Mimi Palmer is dissimilar to that of its fragrant parent, V. tessellata.
Cytotoxic Constituents from Boesenbergia pandurata (Roxb.) Schltr
Mohd Aspollah Sukari,Amy Yap Li Ching,Gwendoline Ee Cheng Lian,Mawardi Rahmani,Kaida Khalid 한국생약학회 2007 Natural Product Sciences Vol.13 No.2
flavonoid derivatives, pinostrobin (1), pinocembrin (2), alpinetin (3), cardamonin (4) andboesenbergin A (5) were isolated from the rhizomes of Boesenbergia pandurata. All compounds were elucidatedbased on its spectroscopic data and by the comparison with the previous works. 2D NMR technique was used forthe structure elucidation of boesenbergin A to complement the data reported previously. The extracts and purecompounds were screened for cytotoxic activity against HL-60 cancer cell lines (human promyelocytic leukemia).Cytotoxic screening showed most of the extracts and pure compounds isolated from the rhizomes of Boesenbergiapandurata were active against HL-60 cancer cell line. The chloroform extract and boesenbergin A showed themost potent cytotoxic activity. KeywordsBoesenbergia rotunda, Kaempferia pandurata, Zingiberaceae, Flavonoids, Cytotoxic
Agne, Birgit,Infanger, Sibylle,Wang, Fei,Hofstetter, Valè,re,Rahim, Gwendoline,Martin, Meryll,Lee, Dong Wook,Hwang, Inhwan,Schnell, Danny,Kessler, Felix American Society for Biochemistry and Molecular Bi 2009 The Journal of biological chemistry Vol.284 No.13
<P>The heterotrimeric Toc core complex of the chloroplast protein import apparatus contains two GTPases, Toc159 and Toc34, together with the protein-conducting channel Toc75. Toc159 and Toc34 are exposed at the chloroplast surface and function in preprotein recognition. Together, they have been shown to facilitate the import of photosynthetic proteins into chloroplasts in Arabidopsis. Consequently, the ppi2 mutant lacking atToc159 has a non-photosynthetic albino phenotype. Previous mutations in the conserved G1 and G3 GTPase motifs abolished the function of Toc159 in vivo by disrupting targeting of the receptor to chloroplasts. Here, we demonstrate that a mutant in a conserved G1 lysine (atToc159 K868R) defective in GTP binding and hydrolysis can target and assemble into Toc complexes. We show that atToc159 K868R can support protein import into isolated chloroplasts, albeit at lower preprotein binding and import efficiencies compared with the wild-type receptor. Considering the absence of measurable GTPase activity in the K868R mutant, we conclude that GTP hydrolysis at atToc159 is not strictly required for preprotein translocation. The data also indicate that preprotein import requires at least one additional GTPase other than Toc159.</P>