Interactions of asparagine-linked carbohydrates with concanavalin: A nuclear magnetic relaxation dispersion and circular dichroism studies

Lokesh Bhattacharyya, Seymour H. Koenig, Rodney D. Brown, Curtis F. Brewer

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Abstract

By using near-UV circular dichroism (CD) and solvent proton nuclear magnetic relaxation dispersion measurements, three different conformational states have been detected in Ca2+-Mn2+-concanavalin A upon binding a variety of asparagine-linked carbohydrates. Two of these transitions have been described previously, one for the binding of monosaccharides such as methyl α-D-mannopyranoside and oligosaccharides with terminal α-Glc or α-Man residues, and the second for the binding of oligomannose and complex type carbohydrates (Brewer, C. F., and Bhattacharyya, L. (1986) J. Biol. Chem. 261, 7306-7310). The third transition occurs upon binding a bisected biantennary complex type carbohydrate with terminal GlcNAc residues. Temperature-dependent nuclear magnetic relaxation dispersion and CD measurements have identified regions of the protein near the two metal ion binding sites that are associated with the conformation changes, and Tyr-12, which is part of the monosaccharide binding site, as responsible for the CD changes. The results support our previous conclusions that the rotamer conformation of the (α 1, 6) arm of bisected complex type oligosaccharides binds to concanavalin A with dihedral angle ω = -60° whereas nonbisected complex type oligosaccharides bind with ω = 180° (Bhattacharyya, L., Haraldsson, M., and Brewer, C. F. (1987) J. Biol. Chem. 262, 1294-1299). The present findings also explain the effects of increasing chain length of bisected complex type carbohydrates on their interactions with the lectin.

Original languageEnglish (US)
Pages (from-to)9835-9840
Number of pages6
JournalJournal of Biological Chemistry
Volume266
Issue number15
StatePublished - 1991

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Magnetic relaxation
Asparagine
Concanavalin A
Circular Dichroism
Oligosaccharides
Carbohydrates
Monosaccharides
Conformations
Binding Sites
Dihedral angle
Chain length
Lectins
Metal ions
Protons
Metals
Ions
Temperature
Proteins

ASJC Scopus subject areas

  • Biochemistry

Cite this

Interactions of asparagine-linked carbohydrates with concanavalin : A nuclear magnetic relaxation dispersion and circular dichroism studies. / Bhattacharyya, Lokesh; Koenig, Seymour H.; Brown, Rodney D.; Brewer, Curtis F.

In: Journal of Biological Chemistry, Vol. 266, No. 15, 1991, p. 9835-9840.

Research output: Contribution to journalArticle

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