5GQB

Crystal structure of chitinase-h from O. furnacalis in complex with chitohepatose


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.200 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure, Catalysis, and Inhibition of OfChi-h, the Lepidoptera-exclusive Insect Chitinase.

Liu, T.Chen, L.Zhou, Y.Jiang, X.Duan, Y.Yang, Q.

(2017) J. Biol. Chem. 292: 2080-2088

  • DOI: 10.1074/jbc.M116.755330
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Chitinase-h (Chi-h) is of special interest among insect chitinases due to its exclusive distribution in lepidopteran insects and high sequence identity with bacterial and baculovirus homologs. Here <i>Of </i>Chi-h, a Chi-h from <i>Ostrinia furnacal ...

    Chitinase-h (Chi-h) is of special interest among insect chitinases due to its exclusive distribution in lepidopteran insects and high sequence identity with bacterial and baculovirus homologs. Here Of Chi-h, a Chi-h from Ostrinia furnacalis , was investigated. Crystal structures of both Of Chi-h and its complex with chitoheptaose ((GlcN) 7 ) reveal that Of Chi-h possesses a long and asymmetric substrate binding cleft, which is a typical characteristics of a processive exo-chitinase. The structural comparison between Of Chi-h and its bacterial homolog Sm ChiA uncovered two phenylalanine-to-tryptophan site variants in Of Chi-h at subsites +2 and possibly -7. The F232W/F396W double mutant endowed Sm ChiA with higher hydrolytic activities toward insoluble substrates, such as insect cuticle, α-chitin, and chitin nanowhisker. An enzymatic assay demonstrated that Of Chi-h outperformed Of ChtI, an insect endo-chitinase, toward the insoluble substrates, but showed lower activity toward the soluble substrate ethylene glycol chitin. Furthermore, Of Chi-h was found to be inhibited by N , N ', N ″-trimethylglucosamine- N , N ', N ″, N ″'-tetraacetylchitotetraose (TMG-(GlcNAc) 4 ), a substrate analog which can be degraded into TMG-(GlcNAc) 1-2 Injection of TMG-(GlcNAc) 4 into 5th-instar O. furnacalis larvae led to severe defects in pupation. This work provides insights into a molting-indispensable insect chitinase that is phylogenetically closer to bacterial chitinases than insect chitinases.


    Organizational Affiliation

    From the State Key Laboratory of Fine Chemical Engineering, School of Life Science and Biotechnology and School of Software, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China and qingyang@dlut.edu.cn.,Institute of Plant Protection, Chinese Academy of Agricultural Sciences, 2 West Yuanmingyuan Road, Beijing 100193, China.,From the State Key Laboratory of Fine Chemical Engineering, School of Life Science and Biotechnology and School of Software, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China and.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Chitinase
A
553Ostrinia furnacalisMutation(s): 0 
Gene Names: OfChi-h
Find proteins for Q4AE59 (Ostrinia furnacalis)
Go to UniProtKB:  Q4AE59
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GCS
Query on GCS

Download SDF File 
Download CCD File 
A
D-GLUCOSAMINE
2-AMINO-2-DEOXY-D-GLUCOSE
C6 H13 N O5
MSWZFWKMSRAUBD-QZABAPFNSA-N
 Ligand Interaction
NAG
Query on NAG

Download SDF File 
Download CCD File 
A
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.200 
  • Space Group: P 2 21 21
Unit Cell:
Length (Å)Angle (°)
a = 49.276α = 90.00
b = 114.220β = 90.00
c = 123.382γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
PHENIXrefinement
HKL-3000data scaling
HKL-3000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2017-01-11
    Type: Initial release
  • Version 1.1: 2017-12-13
    Type: Database references