7C6C

Crystal structure of native chitosanase from Bacillus subtilis MY002


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.26 Å
  • R-Value Free: 0.166 
  • R-Value Work: 0.150 
  • R-Value Observed: 0.151 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Literature

Structure-based rational design of chitosanase CsnMY002 for high yields of chitobiose.

Li, Y.Gou, Y.Liu, Z.Xie, T.Wang, G.

(2021) Colloids Surf B Biointerfaces 202: 111692-111692

  • DOI: https://doi.org/10.1016/j.colsurfb.2021.111692
  • Primary Citation of Related Structures:  
    7C6C, 7C6D

  • PubMed Abstract: 

    Chitosan oligosaccharides (COS) are attractive active molecules for biomedical applications. Currently, the prohibitively high cost of producing fully defined COS hampers extensive studies on their biological activity and restricts their use in various industries. Thus, cost-effective production of pure COS is of major importance. In this report, chitosanase from Bacillus subtilis MY002 (CsnMY002) was prepared for COS production. The structure of apo CsnMY002 displayed an unexpected tunnel-like substrate-binding site and the structure of the CsnMY002_E19A/(GlcN) 6 complex highlighted the "4 + 2″ splitting of hexaglucosamine even though the "3 + 3″ splitting is also observed in the TLC analysis of the enzyme products for hexaglucosamine. Structure based rational design was performed to generate mutants for chitobiose production. The CsnMY002_G21 K mutant produced chitobiose with a relative content > 87 % from chitosan with a low degree of acetylation, and 50.65 mg chitobiose with a purity > 98 % was prepared from 100 mg chitosan. The results provide insight on the catalytic mechanism of chitosanase and underpin future biomedical applications of pure chitobiose.


  • Organizational Affiliation

    Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, Key Laboratory of Environmental Microbiology of Sichuan Province, Chengdu, 610041, China; College of Life Sciences, Sichuan University, Chengdu, 610064, China; University of Chinese Academy of Sciences, Beijing, 100049, China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Chitosanase242Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: csnBSU26890
EC: 3.2.1.132
UniProt
Find proteins for O07921 (Bacillus subtilis (strain 168))
Explore O07921 
Go to UniProtKB:  O07921
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO07921
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
LMR
Query on LMR

Download Ideal Coordinates CCD File 
B [auth A](2S)-2-hydroxybutanedioic acid
C4 H6 O5
BJEPYKJPYRNKOW-REOHCLBHSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.26 Å
  • R-Value Free: 0.166 
  • R-Value Work: 0.150 
  • R-Value Observed: 0.151 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 47.381α = 90
b = 77.666β = 90
c = 79.211γ = 90
Software Package:
Software NamePurpose
HKL-2000data scaling
PHASERphasing
PHENIXrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2021-03-31
    Type: Initial release
  • Version 1.1: 2021-04-07
    Changes: Database references
  • Version 1.2: 2023-11-29
    Changes: Data collection, Database references, Refinement description