7EHO

Chitin oligosaccharide binding protein


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.79 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.179 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural characterization of two solute-binding proteins for N,N' -diacetylchitobiose/ N,N',N'' -triacetylchitotoriose of the gram-positive bacterium, Paenibacillus sp. str. FPU-7.

Itoh, T.Yaguchi, M.Nakaichi, A.Yoda, M.Hibi, T.Kimoto, H.

(2021) J Struct Biol X 5: 100049-100049

  • DOI: https://doi.org/10.1016/j.yjsbx.2021.100049
  • Primary Citation of Related Structures:  
    7EHO, 7EHP, 7EHQ, 7EHU

  • PubMed Abstract: 

    The chitinolytic bacterium Paenibacillus sp. str. FPU-7 efficiently degrades chitin into oligosaccharides such as N -acetyl-D-glucosamine (GlcNAc) and disaccharides (GlcNAc) 2 through multiple secretory chitinases. Transport of these oligosaccharides by P . str. FPU-7 has not yet been clarified. In this study, we identified nagB1 , predicted to encode a sugar solute-binding protein (SBP), which is a component of the ABC transport system. However, the genes next to nagB1 were predicted to encode two-component regulatory system proteins rather than transmembrane domains (TMDs). We also identified nagB2 , which is highly homologous to nagB1 . Adjacent to nagB2 , two genes were predicted to encode TMDs. Binding experiments of the recombinant NagB1 and NagB2 to several oligosaccharides using differential scanning fluorimetry and surface plasmon resonance confirmed that both proteins are SBPs of (GlcNAc) 2 and (GlcNAc) 3 . We determined their crystal structures complexed with and without chitin oligosaccharides at a resolution of 1.2 to 2.0 Å. The structures shared typical SBP structural folds and were classified as subcluster D-I. Large domain motions were observed in the structures, suggesting that they were induced by ligand binding via the "Venus flytrap" mechanism. These structures also revealed chitin oligosaccharide recognition mechanisms. In conclusion, our study provides insight into the recognition and transport of chitin oligosaccharides in bacteria.


  • Organizational Affiliation

    Department of Bioscience and Biotechnology, Fukui Prefectural University, 4-1-1 Matsuokakenjyoujima, Eiheiji-cho, Yoshida-gun, Fukui 910-1195, Japan.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Chitin oligosaccharide binding protein NagB2
A, B
440Paenibacillus sp. FPU-7Mutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
PG4
Query on PG4

Download Ideal Coordinates CCD File 
C [auth A]TETRAETHYLENE GLYCOL
C8 H18 O5
UWHCKJMYHZGTIT-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.79 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.179 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 61.782α = 90
b = 75.978β = 107.13
c = 87.493γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction
HKL-2000data scaling
PHENIXphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Japan Society for the Promotion of Science (JSPS)Japan16K08114
Japan Society for the Promotion of Science (JSPS)Japan19K06340

Revision History  (Full details and data files)

  • Version 1.0: 2021-07-07
    Type: Initial release
  • Version 1.1: 2021-07-14
    Changes: Database references