Crystal structure of Pterocarpus angolensis lectin in complex with glucose, sucrose, and turanoseLoris, R., Imberty, A., Beeckmans, S., Van Driessche, E., Read, J.S., Bouckaert, J., De Greve, H., Buts, L., Wyns, L.
(2003) J Biol Chem 278: 16297-16303
- PubMed: 12595543
- DOI: https://doi.org/10.1074/jbc.M211148200
- Primary Citation of Related Structures:
1N3O, 1N3P, 1N3Q
- PubMed Abstract:
The crystal structure of the Man/Glc-specific seed lectin from Pterocarpus angolensis was determined in complex with methyl-alpha-d-glucose, sucrose, and turanose. The carbohydrate binding site contains a classic Man/Glc type specificity loop. Its metal binding loop on the other hand is of the long type, different from what is observed in other Man/Glc-specific legume lectins. Glucose binding in the primary binding site is reminiscent of the glucose complexes of concanavalin A and lentil lectin. Sucrose is found to be bound in a conformation similar as seen in the binding site of lentil lectin. A direct hydrogen bond between Ser-137(OG) to Fru(O2) in Pterocarpus angolensis lectin replaces a water-mediated interaction in the equivalent complex of lentil lectin. In the turanose complex, the binding site of the first molecule in the asymmetric unit contains the alphaGlc1-3betaFruf form of furanose while the second molecule contains the alphaGlc1-3betaFrup form in its binding site.
Laboratorium voor Ultrastructuur, Instituut voor Moleculaire Biologie, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium. firstname.lastname@example.org