The 2.0 A structure of a cross-linked complex between snowdrop lectin and a branched mannopentaose: evidence for two unique binding modes.
Wright, C.S., Hester, G.(1996) Structure 4: 1339-1352
- PubMed: 8939757 
- DOI: https://doi.org/10.1016/s0969-2126(96)00141-4
- Primary Citation of Related Structures:  
1JPC - PubMed Abstract: 
Galanthus nivalis agglutinin (GNA), a mannose-specific lectin from snowdrop bulbs, is a tetrameric member of the family of Amaryllidaceae lectins that exhibit antiviral activity towards HIV. Its subunits are composed of three pseudo-symmetrically related beta sheet domains, each with a conserved mannose-binding site. Crystal structures of monosaccharide and disaccharide complexes of GNA have revealed that all 12 binding sites of the tetramer are functional, and that the degree of occupancy is dependent on the availability of subsidiary interactions from neighboring subunits. The complex of GNA with a branched mannopentaose ((Manalpha1,6-(alpha1, 3-Man)Man-alpha1,6-(alpha1,3-Man)Man) described here simulates a more biologically relevant complex.
Organizational Affiliation: 
Department of Biochemistry, Virginia Commonwealth University, Richmond, Virginia 23298, USA. cswright@gems.vcu.edu