Biological Assembly 1  

 3D View: Structure | 1D-3D View | Validation Report

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 16.60 kDa 
• Atom Count: 1175 
• Modelled Residue Count: 153 
• Deposited Residue Count: 153 
• Unique protein chains: 1

2LIE

NMR structure of the lectin CCL2

• PDB DOI: 10.2210/pdb2LIE/pdb
• BMRB: 17890

• Classification: SUGAR BINDING PROTEIN
• Organism(s): Coprinopsis cinerea
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2011-08-29 Released: 2012-06-06 
• Deposition Author(s): Schubert, M., Walti, M.A., Egloff, P., Bleuler-Martinez, S., Aebi, M., Allain, F.F.-H., Kunzler, M.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 300 
• Conformers Submitted: 20 
• Selection Criteria: structures with the least restraint violations 

Literature

Plasticity of the beta-Trefoil Protein Fold in the Recognition and Control of Invertebrate Predators and Parasites by a Fungal Defence System

Schubert, M., Bleuler-Martinez, S., Butschi, A., Walti, M.A., Egloff, P., Stutz, K., Yan, S., Wilson, I.B., Hengartner, M.O., Aebi, M., Allain, F.H., Kunzler, M.

(2012) PLoS Pathog 8: e1002706-e1002706

• PubMed: 22615566 
• DOI: 10.1371/journal.ppat.1002706
• Primary Citation of Related Structures:  
  2LIE, 2LIQ


• PubMed Abstract: 
  

Discrimination between self and non-self is a prerequisite for any defence mechanism; in innate defence, this discrimination is often mediated by lectins recognizing non-self carbohydrate structures and so relies on an arsenal of host lectins with different specificities towards target organism carbohydrate structures. Recently, cytoplasmic lectins isolated from fungal fruiting bodies have been shown to play a role in the defence of multicellular fungi against predators and parasites. Here, we present a novel fruiting body lectin, CCL2, from the ink cap mushroom Coprinopsis cinerea. We demonstrate the toxicity of the lectin towards Caenorhabditis elegans and Drosophila melanogaster and present its NMR solution structure in complex with the trisaccharide, GlcNAcβ1,4[Fucα1,3]GlcNAc, to which it binds with high specificity and affinity in vitro. The structure reveals that the monomeric CCL2 adopts a β-trefoil fold and recognizes the trisaccharide by a single, topologically novel carbohydrate-binding site. Site-directed mutagenesis of CCL2 and identification of C. elegans mutants resistant to this lectin show that its nematotoxicity is mediated by binding to α1,3-fucosylated N-glycan core structures of nematode glycoproteins; feeding with fluorescently labeled CCL2 demonstrates that these target glycoproteins localize to the C. elegans intestine. Since the identified glycoepitope is characteristic for invertebrates but absent from fungi, our data show that the defence function of fruiting body lectins is based on the specific recognition of non-self carbohydrate structures. The trisaccharide specifically recognized by CCL2 is a key carbohydrate determinant of pollen and insect venom allergens implying this particular glycoepitope is targeted by both fungal defence and mammalian immune systems. In summary, our results demonstrate how the plasticity of a common protein fold can contribute to the recognition and control of antagonists by an innate defence mechanism, whereby the monovalency of the lectin for its ligand implies a novel mechanism of lectin-mediated toxicity.

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Organizational Affiliation: 

Institute of Molecular Biology and Biophysics, ETH Zürich, Zürich, Switzerland.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CCL2 lectin	A	153	Coprinopsis cinerea	Mutation(s): 0  Gene Names: ccl2
UniProt
Find proteins for B3GA02 (Coprinopsis cinerea) Explore B3GA02  Go to UniProtKB:  B3GA02

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 300 
• Conformers Submitted: 20 
• Selection Criteria: structures with the least restraint violations 
• OLDERADO: 2LIE Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2011-08-29 
• Released Date: 2012-06-06 
Deposition Author(s): Schubert, M., Walti, M.A., Egloff, P., Bleuler-Martinez, S., Aebi, M., Allain, F.F.-H., Kunzler, M.

Revision History  

• Version 1.0: 2012-06-06
  Type: Initial release
  
• Version 1.1: 2021-08-18
  Changes: Data collection, Database references, Experimental preparation, Refinement description