3IK2

Crystal Structure of a Glycoside Hydrolase Family 44 Endoglucanase produced by Clostridium acetobutylium ATCC 824


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.151 
  • R-Value Observed: 0.155 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Tertiary structure and characterization of a glycoside hydrolase family 44 endoglucanase from Clostridium acetobutylicum.

Warner, C.D.Hoy, J.A.Shilling, T.C.Linnen, M.J.Ginder, N.D.Ford, C.F.Honzatko, R.B.Reilly, P.J.

(2010) Appl Environ Microbiol 76: 338-346

  • DOI: 10.1128/AEM.02026-09
  • Primary Citation of Related Structures:  
    3IK2

  • PubMed Abstract: 
  • A gene encoding a glycoside hydrolase family 44 (GH44) protein from Clostridium acetobutylicum ATCC 824 was synthesized and transformed into Escherichia coli. The previously uncharacterized protein was expressed with a C-terminal His tag and purified by nickel-nitrilotriacetic acid affinity chromatography ...

    A gene encoding a glycoside hydrolase family 44 (GH44) protein from Clostridium acetobutylicum ATCC 824 was synthesized and transformed into Escherichia coli. The previously uncharacterized protein was expressed with a C-terminal His tag and purified by nickel-nitrilotriacetic acid affinity chromatography. Crystallization and X-ray diffraction to a 2.2-A resolution revealed a triose phosphate isomerase (TIM) barrel-like structure with additional Greek key and beta-sandwich folds, similar to other GH44 crystal structures. The enzyme hydrolyzes cellotetraose and larger cellooligosaccharides, yielding an unbalanced product distribution, including some glucose. It attacks carboxymethylcellulose and xylan at approximately the same rates. Its activity on carboxymethylcellulose is much higher than that of the isolated C. acetobutylicum cellulosome. It also extensively converts lichenan to oligosaccharides of intermediate size and attacks Avicel to a limited extent. The enzyme has an optimal temperature in a 10-min assay of 55 degrees C and an optimal pH of 5.0.


    Organizational Affiliation

    Department of Chemical and Biological Engineering, 2114 Sweeney Hall, Iowa State University, Ames, IA 50011-2230, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Endoglucanase AA517Clostridium acetobutylicum ATCC 824Mutation(s): 0 
Gene Names: CAC0915CA_C0915
UniProt
Find proteins for Q977Y3 (Clostridium acetobutylicum (strain ATCC 824 / DSM 792 / JCM 1419 / LMG 5710 / VKM B-1787))
Explore Q977Y3 
Go to UniProtKB:  Q977Y3
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download Ideal Coordinates CCD File 
H [auth A]SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
GOL
Query on GOL

Download Ideal Coordinates CCD File 
D [auth A] , E [auth A] , F [auth A] , G [auth A] , K [auth A] , M [auth A] , N [auth A] , O [auth A] , 
D [auth A], E [auth A], F [auth A], G [auth A], K [auth A], M [auth A], N [auth A], O [auth A], Q [auth A]
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
ACT
Query on ACT

Download Ideal Coordinates CCD File 
I [auth A], J [auth A], L [auth A], P [auth A]ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
CA
Query on CA

Download Ideal Coordinates CCD File 
C [auth A]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

Download Ideal Coordinates CCD File 
B [auth A]CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.151 
  • R-Value Observed: 0.155 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.078α = 90
b = 87.285β = 90
c = 103.288γ = 90
Software Package:
Software NamePurpose
d*TREKdata scaling
MOLREPphasing
REFMACrefinement
PDB_EXTRACTdata extraction
CrystalCleardata collection
d*TREKdata reduction
AMoREphasing

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-08-18
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Non-polymer description, Version format compliance