Structures of sugar chains of ricin D

Yoshinobu Kimura, Sumihiro Hase, Yuji Kobayashi, Yoshimasa Kyogoku, Tokuji Ikenaka, Gunki Funatsu

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121 Citations (Scopus)


The toxic lectin, ricin D, contains mannose, fucose, xylose, and N-acetylglucosamine as sugar components. Sugar chains are linked to Asn-10 of the A-chain, and to Asn-95 and Asn-135 of the B-chain (Funatsu, G. et al. (1978) Agric. Biol. Chem. 42, 501-503; Araki, T.& Funatsu, G. (1985) FEBS Lett. 191, 121-124). Asparagine-linked sugar chains of each glycopeptide from ricin D were liberated by hydrazinolysis followed by N-acetylation. The reducing end residues of the sugar chains were coupled with 2-aminopyridine and the pyridylamino (PA-) derivatives obtained were purified by gel-filtration and reversed-phase HPLC. Eight main PA-sugar chains were obtained from three glycopeptides and the structures of these sugar chains were determined by component analysis, stepwise exoglycosidase digestions, partial acetolysis, and 500 MHZ 1H-NMR spectroscopy. The results show that oligomannose type sugar chains (Man6-7GlcNAc2) are linked to Asn-95; Man5-7 GlcNAc2 and M4X (structure, see below) to Asn-135 of the B-chain, and M3FX and M3X to Asn-10 of the A-chain.Manα13Manα1{set minus}M36anβ1-4GlcNAcβ1-4GlcNAcM4X Manα12{set minus}Xylβ1Manα1{set minus}M36anβ1-4GlcNAcβ1-4GlcNAcM3XManα12{set minus}Xylβ1Manα1{set minus}M36anβ1-4GlcNAcβ1-4GlcNAcM3FXManα12{set minus}3Xylβ1Fucα1

Original languageEnglish
Pages (from-to)944-949
Number of pages6
JournalJournal of biochemistry
Issue number6
Publication statusPublished - Jun 1988
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology


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