Journal
CARBOHYDRATE POLYMERS
Volume 98, Issue 1, Pages 522-531Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2013.06.003
Keywords
Jatropha curcas L.; Arabinogalactan proteins; Fasciclin; Xylogen; LysM; N-/O-glycosylation
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Funding
- German Research Foundation DFG (International Research Training Group 1549 Molecular and Cellular Glyco-Sciences MCGS, Munster Hyderabad)
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An non-GPI-anchored AGP cluster (Y2) was isolated from the seeds of Jatropha curcas L (Euphorbiaceae) composed of 4.8% polypeptides (mainly Ala, Ser, Gly, Hyp, Glu) and a carbohydrate moiety composed of Gal, Ara, GlcA, Rha, Man and GlcN. Besides the typical structural features of arabinogalactan proteins, typical N-glycan linker of the complex type (GIcNAc(4)Man(3)Gal(2)Fuc(1)Xyl(1)) were identified. O-glycosylation occurred mainly via Hyp and to a lesser extent via Thr and Ser. N-glycans from the complex type, carrying at the innermost GlcNAc at position O-3 one alpha-Fuc-residue, were also present. MS analysis of the tryptic digest assigned peptides of three major protein groups: fasciclin-like arabinogalactan proteins, xylogen-like proteins and LysM domain-containing proteins. They could not be separated further and it is indicated that various homologous protein forms co-exist. Histological investigation off. curcas seeds revealed the presence of AGPs in the vessels of cotyledons and in the procambium ring of the embryo. (C) 2013 Elsevier Ltd. All rights reserved.
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