Crystal structure of Aspergillus niger chitinase B

Experimental Data Snapshot

  • Resolution: 1.95 Å
  • R-Value Free: 0.196 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.171 

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This is version 1.4 of the entry. See complete history


Potent Fungal Chitinase for the Bioconversion of Mycelial Waste.

Liu, T.Han, H.Wang, D.Guo, X.Zhou, Y.Fukamizo, T.Yang, Q.

(2020) J Agric Food Chem 68: 5384-5390

  • DOI: https://doi.org/10.1021/acs.jafc.0c01342
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Aspergillus niger mycelial waste is a good raw material for production of N -acetyl-d-glucosamine (GlcNAc). In this study, An ChiB, an A. niger chitinase which is upregulated during autolysis, was found to degrade A. niger mycelial waste with high efficiency. It could produce 1.45 mM (GlcNAc) 2 in 8 h from raw mycelial waste, outperforming other chitinases, including bacterial Sm ChiA, human Hs Cht, and insect Of ChtI and Of Chi-h. The crystal structure of An ChiB was determined, and residues Trp 106 and Trp 118 were found to be important for the activity of An ChiB toward mycelial waste; mutation of either Trp 106 or Trp 118 into phenylalanine or alanine resulted in dramatically decreased activity. A recombinant strain of Bacillus subtilis was constructed to extracellularly produce An ChiB, and the culture supernatant was used to treat mycelial waste. This eco-friendly strategy could produce 3.7 mM of GlcNAc from 10 g of mycelial waste in 94 h with a yield of 71.3%.

  • Organizational Affiliation

    School of Bioengineering, Dalian University of Technology, Dalian 116024, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Glycosyl hydrolases family 18 family protein410Aspergillus nigerMutation(s): 0 
Gene Names: An08g09030
Find proteins for A5AB48 (Aspergillus niger (strain ATCC MYA-4892 / CBS 513.88 / FGSC A1513))
Explore A5AB48 
Go to UniProtKB:  A5AB48
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA5AB48
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.95 Å
  • R-Value Free: 0.196 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.171 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 62.095α = 90
b = 74.956β = 90
c = 99.195γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Natural Science Foundation of ChinaChina31425021
National Natural Science Foundation of ChinaChina61202252

Revision History  (Full details and data files)

  • Version 1.0: 2019-10-09
    Type: Initial release
  • Version 1.1: 2020-04-22
    Changes: Database references
  • Version 1.2: 2020-05-20
    Changes: Database references
  • Version 1.3: 2020-05-27
    Changes: Database references
  • Version 1.4: 2023-11-22
    Changes: Data collection, Database references, Refinement description