6A1U

Charcot-Leyden crystal protein/Galectin-10 variant E33D

  • Classification: PROTEIN BINDING
  • Organism(s): Homo sapiens
  • Expression System: Escherichia coli
  • Mutation(s): 

  • Deposited: 2018-06-08 Released: 2018-12-26 
  • Deposition Author(s): Su, J.
  • Funding Organization(s): National Natural Science Foundation of China 

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.62 Å
  • R-Value Free: 0.193 
  • R-Value Work: 0.171 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Identification of key amino acid residues determining ligand binding specificity, homodimerization and cellular distribution of human galectin-10

Su, J.Song, C.Si, Y.Cui, L.Yang, T.Li, Y.Wang, H.Tai, G.Zhou, Y.

(2019) Glycobiology 29: 85-93

  • DOI: 10.1093/glycob/cwy087
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Charcot-Leyden crystal protein/Gal-10, abundantly expressed in eosinophils and basophils, is related to several immune diseases. Recently, crystallographic and biochemical studies showed that Gal-10 cannot bind lactose, because a glutamate residue (G ...

    Charcot-Leyden crystal protein/Gal-10, abundantly expressed in eosinophils and basophils, is related to several immune diseases. Recently, crystallographic and biochemical studies showed that Gal-10 cannot bind lactose, because a glutamate residue (Glu33) from another monomer blocks the binding site. Moreover, Gal-10 actually forms a novel dimeric structure compared to other galectins. To investigate the role that Glu33 plays in inhibiting lactose binding, we mutated this residue to glutamine, aspartate, and alanine. The structure of E33A shows that Gal-10 can now bind lactose. In the hemagglutination assay, lactose could inhibit E33A from inducing chicken erythrocyte agglutination. Furthermore, we identified a tryptophan residue (Trp127) at the interface of homodimer that is crucial for Gal-10 dimerization. The variant W127A, which exists as a monomer, exhibited higher hemagglutination activity than wild type Gal-10. The solid phase assay also showed that W127A could bind to lactose-modified sepharose-6B, whereas wild type Gal-10 could not. This indicates that the open carbohydrate-binding site of the W127A monomer can bind to lactose. In addition, the distribution of EGFP-tagged Gal-10 and its variants in HeLa cells was investigated. Because Trp72 is the highly conserved in the ligand binding sites of galectins, we used EGFP-tagged W72A to show that Gal-10 could not be transported into the nucleus, indicating that Trp72 is crucial for Gal-10 transport into that organelle.


    Organizational Affiliation

    Jilin Province Key Laboratory for Chemistry and Biology of Natural Drugs in Changbai Mountain, The School of Life Sciences, Northeast Normal University, Changchun, China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Galectin-10
A
145Homo sapiensMutation(s): 1 
Gene Names: CLC (LGALS10, LGALS10A)
Find proteins for Q05315 (Homo sapiens)
Go to Gene View: CLC
Go to UniProtKB:  Q05315
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.62 Å
  • R-Value Free: 0.193 
  • R-Value Work: 0.171 
  • Space Group: P 65 2 2
Unit Cell:
Length (Å)Angle (°)
a = 48.774α = 90.00
b = 48.774β = 90.00
c = 259.354γ = 120.00
Software Package:
Software NamePurpose
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2018-06-08 
  • Released Date: 2018-12-26 
  • Deposition Author(s): Su, J.

Funding OrganizationLocationGrant Number
National Natural Science Foundation of ChinaChina31500637

Revision History 

  • Version 1.0: 2018-12-26
    Type: Initial release