Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 58.64 kDa 
• Atom Count: 5129 
• Modelled Residue Count: 540 
• Deposited Residue Count: 540 
• Unique protein chains: 1

1EDQ

CRYSTAL STRUCTURE OF CHITINASE A FROM S. MARCESCENS AT 1.55 ANGSTROMS

• PDB DOI: 10.2210/pdb1EDQ/pdb

• Classification: HYDROLASE
• Organism(s): Serratia marcescens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2000-01-28 Released: 2000-02-18 
• Deposition Author(s): Papanikolau, Y., Petratos, K.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.55 Å
• R-Value Free: 0.215 
• R-Value Work: 0.187 
• R-Value Observed: 0.188 

Literature

De novo purification scheme and crystallization conditions yield high-resolution structures of chitinase A and its complex with the inhibitor allosamidin.

Papanikolau, Y., Tavlas, G., Vorgias, C.E., Petratos, K.

(2003) Acta Crystallogr D Biol Crystallogr 59: 400-403

• PubMed: 12554965 
• DOI: 10.1107/s0907444902021923
• Primary Citation of Related Structures:  
  1EDQ, 1FFQ


• PubMed Abstract: 
  

The purification scheme of chitinase A (ChiA) from S. marcescens has been extensively revised. The pure enzyme crystallizes readily under new crystallization conditions. The ChiA crystal structure has been refined to 1.55 A resolution and the crystal structure of ChiA co-crystallized with the inhibitor allosamidin has been refined to 1.9 A resolution. Allosamidin is located in the deep active-site tunnel of ChiA and interacts with three important residues: Glu315, the proton donor of the catalysis, Asp313, which adopts two conformations in the native structure but is oriented towards Glu315 in the inhibitor complex, and Tyr390, which lies opposite Glu315 in the active-site tunnel.

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Related Citations: 

• Crystal structure of a bacterial chitinase at 2.3 Angstrom resolution
  Perrakis, A., Tews, I., Dauter, Z., Oppenheim, A.B., Chet, I., Wilson, K.S., Vorgias, C.E.
  (1994) Structure 2: 1169

• HIGH RESOLUTION STRUCTURAL ANALYSES OF MUTANT CHITINASE A COMPLEXES WITH SUBSTRATES PROVIDE NEW INSIGHT INTO THE MECHANISM OF CATALYSIS
  PAPANIKOLAU, Y., PRAG, G., TAVLAS, G., VORGIAS, C.E., OPPENHEIM, A.B., PETRATOS, K.
  (2001) Biochemistry 40: 11338

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Organizational Affiliation: 

Institute of Molecular Biology and Biotechnology (IMBB)-FORTH, PO Box 1527, 71110 Heraklion, Greece.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CHITINASE A	A	540	Serratia marcescens	Mutation(s): 0  Gene Names: chiA EC: 3.2.1.14
UniProt
Find proteins for O83008 (Serratia marcescens) Explore O83008  Go to UniProtKB:  O83008

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.55 Å
• R-Value Free: 0.215 
• R-Value Work: 0.187 
• R-Value Observed: 0.188 
• Space Group: C 2 2 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 199.497	α = 90
b = 131.825	β = 90
c = 59.368	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
AMoRE	phasing
REFMAC	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2000-01-28 
• Released Date: 2000-02-18 
Deposition Author(s): Papanikolau, Y., Petratos, K.

Revision History  

• Version 1.0: 2000-02-18
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance