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1. (Article ID: 11238)
 
Yoo JY, Ko KS, Seo H-K, Park S, Fanata WID, Harmoko R, Ramasamy NK, Thulasinathan T, Mengiste T, Lim J-M, Lee SY, Lee KO
Limited addition of the 6-arm β1,2-linked N-acetylglucosamine (GlcNAc) residue facilitates the formation of the largest N-glycan in plants
Journal of Biological Chemistry 290 (2015) 16560-16572
 

The most abundant N-glycan in plants is the paucimannosidic N-glycan with core β1,2-xylose and α1,3-fucose residues (Man3XylFuc(GlcNAc)2). Here, we report a mechanism in Arabidopsis thaliana that efficiently produces the largest N-glycan in plants. Genetic and biochemical evidence indicates that the addition of the 6-arm β1,2-GlcNAc residue by N-acetylglucosaminyltransferase II (GnTII) is less effective than additions of the core β1,2-xylose and α1,3-fucose residues by XylT, FucTA, and FucTB in Arabidopsis. Furthermore, analysis of gnt2 mutant and 35S:GnTII transgenic plants shows that the addition of the 6-arm non-reducing GlcNAc residue to the common N-glycan acceptor GlcNAcMan3(GlcNAc)2 inhibits additions of the core β1,2-xylose and α1,3-fucose residues. Our findings indicate that plants limit the rate of the addition of the 6-arm GlcNAc residue to the common N-glycan acceptor as a mechanism to facilitate formation of the prevalent N-glycans with Man3XylFuc(GlcNAc)2 and (GlcNAc)2Man3XylFuc(GlcNAc)2 structures.

glycosyltransferase, glycosylation, plant, post-translational modification (PTM), carbohydrate processing

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2. (Article ID: 11545)
 
Hamed A, El-Emary N
Triterpene saponins from Glinus lotoides var. dictamnoides
Phytochemistry 50(3) (1998) 477-480
 

Two 5β-H-hopane triterpenoidal saponins (glinusides D and E) were isolated on reinvestigation of the n-butanol soluble fraction of Glinus lotoides var. dictamnoides, in contrast to the 5α-H, 6-keto-hopane derivatives isolated from the same source. The structures of these saponins were established by extensive spectral analysis as 3-O-β-L-arabinopyranosyl- 22-α-L-rhamnopyranosyl (1 → 4)-β-D-glucopyranosyl-5β-H-16β-hydroxyhopane and 3-O-β-L-arabinopyranosyl-22-O-β-D-glucopyranosyl-(1 → 4)-β-D- glucopyranosyl-5β-H-16-β-hydroxyhopane, respectively.

5β-H-hopane, Glinus lotoides var. dictamnoides, glinusides D and E, Molluginaceae, triterpenoidal saponins

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