3H3K

Structure of A. acidocaldarius cellulase CelA in complex with cellotetraose

• PDB DOI: https://doi.org/10.2210/pdb3H3K/pdb

• Classification: HYDROLASE
• Organism(s): Alicyclobacillus acidocaldarius subsp. acidocaldarius
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2009-04-16 Released: 2009-10-13 
• Deposition Author(s): Morera, S., Eckert, K.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.10 Å
• R-Value Free: 0.217 
• R-Value Work: 0.186 
• R-Value Observed: 0.188 

Biological Assembly 1  

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

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 60.22 kDa 
• Atom Count: 4,330 
• Modelled Residue Count: 528 
• Deposited Residue Count: 537 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Cellulase	A	537	Alicyclobacillus acidocaldarius subsp. acidocaldarius	Mutation(s): 0  Gene Names: celA EC: 3.2.1.4
UniProt
Find proteins for Q9AJS0 (Alicyclobacillus acidocaldarius subsp. acidocaldarius) Explore Q9AJS0  Go to UniProtKB:  Q9AJS0

Oligosaccharides

Help

Entity ID: 2
Molecule	Chains	Length	2D Diagram	Glycosylation	3D Interactions
beta-D-glucopyranose-(1-4)-beta-D-glucopyranose-(1-4)-beta-D-glucopyranose-(1-4)-alpha-D-glucopyranose	B	4		N/A
Glycosylation Resources
GlyTouCan:  G41724ZD GlyCosmos:  G41724ZD GlyGen:  G41724ZD

Small Molecules

Ligands 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
BGC	C [auth A]	beta-D-glucopyranose C6 H12 O6 WQZGKKKJIJFFOK-VFUOTHLCSA-N
MPD	F [auth A], G [auth A]	(4S)-2-METHYL-2,4-PENTANEDIOL C6 H14 O2 SVTBMSDMJJWYQN-YFKPBYRVSA-N
ZN	E [auth A]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N
CA	D [auth A]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.10 Å
• R-Value Free: 0.217 
• R-Value Work: 0.186 
• R-Value Observed: 0.188 
• Space Group: P 2₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 85.09	α = 90
b = 129.3	β = 90
c = 49.13	γ = 90

Software Package:

Software Name	Purpose
JDirector	data collection
PHASER	phasing
REFMAC	refinement
XDS	data reduction
XDS	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2009-10-13 
Deposition Author(s): Morera, S., Eckert, K.

Revision History  

• Version 1.0: 2009-10-13
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 2.0: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Advisory, Atomic model, Data collection, Derived calculations, Structure summary
• Version 2.1: 2023-11-01
  Changes: Data collection, Database references, Refinement description, Structure summary