3WMP image
Deposition Date 2013-11-22
Release Date 2015-01-14
Last Version Date 2024-11-20
Entry Detail
PDB ID:
3WMP
Title:
Crystal structure of SLL-2
Biological Source:
Source Organism:
Method Details:
Experimental Method:
Resolution:
2.00 Å
R-Value Free:
0.27
R-Value Work:
0.25
R-Value Observed:
0.25
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Galactose-binding lectin
Gene (Uniprot):sll-2b
Chain IDs:A, B, C, D, E, F
Chain Length:94
Number of Molecules:6
Biological Source:Sinularia lochmodes
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
ASN A ASN GLYCOSYLATION SITE
Primary Citation
Crystal structure of a symbiosis-related lectin from octocoral.
Glycobiology 25 1016 1023 (2015)
PMID: 26022515 DOI: 10.1093/glycob/cwv033

Abstact

D-Galactose-binding lectin from the octocoral, Sinularia lochmodes (SLL-2), 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 dinoflagellate into a non-motile (coccoid) symbiotic state. SLL-2 binds with high affinity to the Forssman antigen (N-acetylgalactosamine(GalNAc)α1-3GalNAcβ1-3Galα1-4Galβ1-4Glc-ceramide), and the presence of Forssman antigen-like sugar on the surface of Symbiodinium CS-156 cells was previously confirmed. Here we report the crystal structures of SLL-2 and its GalNAc complex as the first crystal structures of a lectin involved in the symbiosis between coral and dinoflagellate. N-Linked sugar chains and a galactose derivative binding site common to H-type lectins were observed in each monomer of the hexameric SLL-2 crystal structure. In addition, unique sugar-binding site-like regions were identified at the top and bottom of the hexameric SLL-2 structure. These structural features suggest a possible binding mode between SLL-2 and Forssman antigen-like pentasaccharide.

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Primary Citation of related structures