1G01

ALKALINE CELLULASE K CATALYTIC DOMAIN

• PDB DOI: https://doi.org/10.2210/pdb1G01/pdb

• Classification: HYDROLASE
• Organism(s): Bacillus sp. KSM-635
• Expression System: Bacillus subtilis
• Mutation(s): No 


• Deposited: 2000-10-05 Released: 2001-08-01 
• Deposition Author(s): Shirai, T., Ishida, H., Noda, J., Yamane, T., Ozaki, K., Hakamada, Y., Ito, S.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free: 0.227 
• R-Value Work: 0.196 

Literature

Crystal structure of alkaline cellulase K: insight into the alkaline adaptation of an industrial enzyme.

Shirai, T., Ishida, H., Noda, J., Yamane, T., Ozaki, K., Hakamada, Y., Ito, S.

(2001) J Mol Biol 310: 1079-1087

• PubMed: 11501997 
• DOI: https://doi.org/10.1006/jmbi.2001.4835
• Primary Citation of Related Structures:  
  1G01


• PubMed Abstract: 
  

  The crystal structure of the catalytic domain of alkaline cellulase K was determined at 1.9 A resolution. Because of the most alkaliphilic nature and it's highest activity at pH 9.5, it is used commercially in laundry detergents. An analysis of the structural bases of the alkaliphilic character of the enzyme suggested a mechanism similar to that previously proposed for alkaline proteases, that is, an increase in the number of Arg, His, and Gln residues, and a decrease in Asp and Lys residues. Some ion pairs were formed by the gained Arg residues, which is similar to what has been found in the alkaline proteases. Lys-Asp ion pairs are disfavored and partly replaced with Arg-Asp ion pairs. The alkaline adaptation appeared to be a remodeling of ion pairs so that the charge balance is kept in the high pH range.

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Organizational Affiliation: 

Department of Biotechnology and Biomaterial Chemistry, Graduate School of Engineering, Nagoya University, Japan. [e-mail]

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 41.79 kDa 
• Atom Count: 3,286 
• Modelled Residue Count: 357 
• Deposited Residue Count: 364 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
ENDOGLUCANASE	A	364	Bacillus sp. KSM-635	Mutation(s): 0  EC: 3.2.1.4
UniProt
Find proteins for P19424 (Bacillus sp. (strain KSM-635)) Explore P19424  Go to UniProtKB:  P19424

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CD	B [auth A], C [auth A], D [auth A], E [auth A], F [auth A], G [auth A], H [auth A], I [auth A], J [auth A], K [auth A]	CADMIUM ION Cd WLZRMCYVCSSEQC-UHFFFAOYSA-N
ACY	L [auth A], M [auth A], N [auth A], O [auth A], P [auth A]	ACETIC ACID C2 H4 O2 QTBSBXVTEAMEQO-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free: 0.227 
• R-Value Work: 0.196 
• Space Group: P 3₂ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 98.2	α = 90
b = 98.2	β = 90
c = 122	γ = 120

Software Package:

Software Name	Purpose
AMoRE	phasing
X-PLOR	refinement
DENZO	data reduction
SCALEPACK	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2001-08-01 
Deposition Author(s): Shirai, T., Ishida, H., Noda, J., Yamane, T., Ozaki, K., Hakamada, Y., Ito, S.

Revision History  

• Version 1.0: 2001-08-01
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Source and taxonomy, Version format compliance
• Version 1.3: 2011-11-16
  Changes: Atomic model
• Version 1.4: 2024-03-13
  Changes: Data collection, Database references, Derived calculations