Crystal structure of octocoral lectin SLL-2 complexed with Forssman antigen tetrasaccharide

Glycobiology
Akiko KitaKunio Miki

Abstract

A symbiosis-related lectin, SLL-2, from the octocoral Sinularia lochmodes, distributes densely on the cell surface of microalgae, Symbiodinium sp., an endosymbiotic dinoflagellate of the coral, and is also shown to be a chemical cue that transforms dinoflagellates into a nonmotile (coccoid) symbiotic state. SLL-2 binds to the sugar chain of the molecule similar to Forssman antigen pentasaccharide (GalNAcα1-3GalNAcβ1-3 Galα1-4 Galβ1-4Glc) on the surface of microalgae with high affinity. Here we report the crystal structure of the complex between SLL-2 and Forssman antigen tetrasaccharide (GalNAcα1-3GalNAcβ1-3 Galα1-4 Galβ) at 3.4 Å resolution. In an asymmetric unit of the crystal, there are two hexameric molecules with totally 12 sugar recognition sites. At 9 in 12 sites, the first and second saccharides of the Forssman antigen tetrasaccharide bind directly to galactopyranoside binding site of SLL-2, whereas the third and fourth saccharides have no interaction with the SLL-2 hexameric molecule that binds the first saccharide. The sugar chain bends at α-1,4-glycosidic linkage between the third and fourth saccharides toward the position that we defined as a pyranoside binding site in the crystal structure of the complex between SL...Continue Reading

References

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May 18, 2006·The Journal of Biological Chemistry·Jean-Frederic SanchezEdward P Mitchell
Jan 9, 2010·Acta Crystallographica. Section D, Biological Crystallography·Vincent B ChenDavid C Richardson
May 30, 2015·Glycobiology·Akiko KitaKunio Miki
Nov 13, 2015·Journal of the American Chemical Society·Kieran L HudsonDerek N Woolfson
Jan 1, 1997·Methods in Enzymology·Zbyszek Otwinowski, Wladek Minor

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