6BT9

Chitinase ChiA74 from Bacillus thuringiensis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.26 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.239 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

The crystal structure of the chitinase ChiA74 of Bacillus thuringiensis has a multidomain assembly.

Juarez-Hernandez, E.O.Casados-Vazquez, L.E.Brieba, L.G.Torres-Larios, A.Jimenez-Sandoval, P.Barboza-Corona, J.E.

(2019) Sci Rep 9: 2591-2591

  • DOI: 10.1038/s41598-019-39464-z

  • PubMed Abstract: 
  • There is no structural information about any chitinase synthesized by Bacillus thuringiensis, the most successful microbial insect larvicide used worldwide. In this study, we solved the 3D structure of the chitinase ChiA74 at 2.26 Å. The crystal stru ...

    There is no structural information about any chitinase synthesized by Bacillus thuringiensis, the most successful microbial insect larvicide used worldwide. In this study, we solved the 3D structure of the chitinase ChiA74 at 2.26 Å. The crystal structure shows that ChiA74 is composed of a modular arrangement formed by (i) a catalytic region (CD), (ii) a chitinase insertion domain (CID), (iii) a fibronectin type III domain (FnIII), and (iv) a chitin binding domain (CBD). The location of the CBD with respect to the CD has no structural similarity to other chitinases with known structures. The activity of a ChiA74 lacking its secretion signal peptide (ChiA74Δsp) and a truncated version lacking its CBD/FnIII domains (ChiA74Δsp-50) did not have statistical differences in activity against colloidal chitin. However, ChiA74Δsp exhibits 4.5 and 2.0 higher activity than versions lacking the CBD (ChiA74Δsp-60) and CBD/FnIII domains (ChiA74Δsp-50), respectively, when crystalline chitin was used as substrate. Our data suggest that the CBD might plays a significant role in crystalline chitin hydrolysis. We also demonstrated the importance of the catalytic E211 in the CD, as mutants ChiA74Δsp E211N and ChiA74Δsp D207N, E211N were inactive against colloidal and crystalline chitins, chitosan and 4-MU-GlcNAc 3 . ChiA74 has a processive activity producing oligosaccharides with degree of polymerization (DP) of 1 (GlcNAc) and 2 (GlcNAc 2 ).


    Organizational Affiliation

    Universidad de Guanajuato Campus Irapuato-Salamanca, División de Ciencias de la Vida, Posgrado en Biociencias, Irapuato, Guanajuato, 36500, Mexico.,Laboratorio Nacional de Genómica para la Biodiversidad, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (LANGEBIO-CINVESTAV), Apartado Postal 629, Irapuato, Guanajuato, 36824, Mexico.,Universidad de Guanajuato Campus Irapuato-Salamanca, División de Ciencias de la Vida, Departamento de Alimentos, Irapuato, Guanajuato, 36500, Mexico.,Laboratorio Nacional de Genómica para la Biodiversidad, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (LANGEBIO-CINVESTAV), Apartado Postal 629, Irapuato, Guanajuato, 36824, Mexico. pedro.jimenez@cinvestav.mx.,Departamento de Bioquímica y Biología Estructural, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Circuito Exterior s/n, Ciudad Universitaria, Apartado Postal 70-243, Ciudad de México, 04510, Mexico.,Universidad de Guanajuato Campus Irapuato-Salamanca, División de Ciencias de la Vida, Posgrado en Biociencias, Irapuato, Guanajuato, 36500, Mexico. josebar@ugto.mx.,Universidad de Guanajuato Campus Irapuato-Salamanca, División de Ciencias de la Vida, Departamento de Alimentos, Irapuato, Guanajuato, 36500, Mexico. josebar@ugto.mx.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Chitinase
A, B
672Bacillus thuringiensisMutation(s): 0 
Find proteins for A0A243G6Q6 (Bacillus thuringiensis)
Go to UniProtKB:  A0A243G6Q6
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A, B
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.26 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.239 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 85.827α = 90.00
b = 82.407β = 108.11
c = 101.570γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
DIALSdata reduction
PDB_EXTRACTdata extraction
PHASERphasing
Aimlessdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Mexico258220

Revision History 

  • Version 1.0: 2019-03-06
    Type: Initial release