1QGI

CHITOSANASE FROM BACILLUS CIRCULANS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.192 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of chitosanase from Bacillus circulans MH-K1 at 1.6-A resolution and its substrate recognition mechanism.

Saito, J.Kita, A.Higuchi, Y.Nagata, Y.Ando, A.Miki, K.

(1999) J.Biol.Chem. 274: 30818-30825

  • DOI: 10.1074/jbc.274.43.30818
  • Also Cited By: 2D05

  • PubMed Abstract: 
  • Chitosanase from Bacillus circulans MH-K1 is a 29-kDa extracellular protein composed of 259 amino acids. The crystal structure of chitosanase from B. circulans MH-K1 has been determined by multiwavelength anomalous diffraction method and refined to c ...

    Chitosanase from Bacillus circulans MH-K1 is a 29-kDa extracellular protein composed of 259 amino acids. The crystal structure of chitosanase from B. circulans MH-K1 has been determined by multiwavelength anomalous diffraction method and refined to crystallographic R = 19.2% (R(free) = 23.5%) for the diffraction data at 1.6-A resolution collected by synchrotron radiation. The enzyme has two globular upper and lower domains, which generate the active site cleft for the substrate binding. The overall molecular folding is similar to chitosanase from Streptomyces sp. N174, although there is only 20% identity at the amino acid sequence level between both chitosanases. However, there are three regions in which the topology is remarkably different. In addition, the disulfide bridge between Cys(50) and Cys(124) joins the beta1 strand and the alpha7 helix, which is not conserved among other chitosanases. The orientation of two backbone helices, which connect the two domains, is also different and is responsible for the differences in size and shape of the active site cleft in these two chitosanases. This structural difference in the active site cleft is the reason why the enzymes specifically recognize different substrates and catalyze different types of chitosan degradation.


    Related Citations: 
    • Crystallization and Preliminary X-Ray Crystallographic Analysis of Chitosanase from Bacillus Circulans Mh-K1
      Saito, J.,Kita, A.,Nagata, Y.,Ando, A.,Miki, K.
      (1995) Acta Crystallogr.,Sect.D 51: 856


    Organizational Affiliation

    Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (CHITOSANASE)
A
259Bacillus circulansMutation(s): 0 
Gene Names: csn
EC: 3.2.1.132
Find proteins for P33673 (Bacillus circulans)
Go to UniProtKB:  P33673
Small Molecules
Ligands 3 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
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 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: 1.6 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.192 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 43.300α = 90.00
b = 128.000β = 90.00
c = 57.700γ = 90.00
Software Package:
Software NamePurpose
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-10-25
    Type: Initial release
  • Version 1.1: 2008-04-26
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Non-polymer description, Version format compliance