1XI0

X-ray crystal structure of wild-type Xerocomus chrysenteron lectin XCL

Summary for 1XI0

• Entry DOI: 10.2210/pdb1xi0/pdb
• Related: 1X99
• Descriptor: lectin (2 entities in total)
• Functional Keywords: beta sandwich, greek key motif, sugar binding protein
• Biological source: Xerocomus chrysenteron
• Total number of polymer chains: 2
• Total formula weight: 32063.62

Authors

Birck, C.,Damian, L.,Marty-Detraves, C.,Lougarre, A.,Schulze-Briese, C.,Koehl, P.,Fournier, D.,Paquereau, L.,Samama, J.P. (deposition date: 2004-09-21, release date: 2005-08-30, Last modification date: 2023-10-25)

Primary citation

Birck, C.,Damian, L.,Marty-Detraves, C.,Lougarre, A.,Schulze-Briese, C.,Koehl, P.,Fournier, D.,Paquereau, L.,Samama, J.P.
A new lectin family with structure similarity to actinoporins revealed by the crystal structure of Xerocomus chrysenteron lectin XCL
J.Mol.Biol., 344:1409-1420, 2004

PubMed Abstract: A newly defined family of fungal lectins displays no significant sequence similarity to any protein in the databases. These proteins, made of about 140 amino acid residues, have sequence identities ranging from 38% to 65% and share binding specificity to N-acetyl galactosamine. One member of this family, the lectin XCL from Xerocomus chrysenteron, induces drastic changes in the actin cytoskeleton after sugar binding at the cell surface and internalization, and has potent insecticidal activity. The crystal structure of XCL to 1.4 A resolution reveals the architecture of this new lectin family. The fold of the protein is not related to any of the several lectin folds documented so far. Unexpectedly, the structure similarity is significant with actinoporins, a family of pore-forming toxins. The specific structural features and sequence signatures in each protein family suggest a potential sugar binding site in XCL and a possible evolutionary relationship between these proteins. Finally, the tetrameric assembly of XCL reveals a complex network of protomer-protomer interfaces and generates a large, hydrated cavity of 1000 A3, which may become accessible to larger solutes after a small conformational change of the protein.

PubMed: 15561152
DOI: 10.1016/j.jmb.2004.10.007

Experimental method

X-RAY DIFFRACTION (2 Å)