4EL8

The unliganded structure of C.bescii CelA GH48 module


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.45 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.195 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Revealing nature's cellulase diversity: the digestion mechanism of Caldicellulosiruptor bescii CelA.

Brunecky, R.Alahuhta, M.Xu, Q.Donohoe, B.S.Crowley, M.F.Kataeva, I.A.Yang, S.J.Resch, M.G.Adams, M.W.Lunin, V.V.Himmel, M.E.Bomble, Y.J.

(2013) Science 342: 1513-1516

  • DOI: 10.1126/science.1244273
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Most fungi and bacteria degrade plant cell walls by secreting free, complementary enzymes that hydrolyze cellulose; however, some bacteria use large enzymatic assemblies called cellulosomes, which recruit complementary enzymes to protein scaffolds. T ...

    Most fungi and bacteria degrade plant cell walls by secreting free, complementary enzymes that hydrolyze cellulose; however, some bacteria use large enzymatic assemblies called cellulosomes, which recruit complementary enzymes to protein scaffolds. The thermophilic bacterium Caldicellulosiruptor bescii uses an intermediate strategy, secreting many free cellulases that contain multiple catalytic domains. One of these, CelA, comprises a glycoside hydrolase family 9 and a family 48 catalytic domain, as well as three type III cellulose-binding modules. In the saccharification of a common cellulose standard, Avicel, CelA outperforms mixtures of commercially relevant exo- and endoglucanases. From transmission electron microscopy studies of cellulose after incubation with CelA, we report morphological features that suggest that CelA not only exploits the common surface ablation mechanism driven by general cellulase processivity, but also excavates extensive cavities into the surface of the substrate. These results suggest that nature's repertoire of cellulose digestion paradigms remain only partially discovered and understood.


    Organizational Affiliation

    Biosciences Center, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO 80401, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Glycoside hydrolase family 48
A
634Caldicellulosiruptor bescii (strain ATCC BAA-1888 / DSM 6725 / Z-1320)Mutation(s): 0 
EC: 3.2.1.4
Find proteins for B9MKU7 (Caldicellulosiruptor bescii (strain ATCC BAA-1888 / DSM 6725 / Z-1320))
Go to UniProtKB:  B9MKU7
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
CA
Query on CA

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Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
EDO
Query on EDO

Download SDF File 
Download CCD File 
A
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.45 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.195 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 116.300α = 90.00
b = 57.666β = 102.30
c = 106.060γ = 90.00
Software Package:
Software NamePurpose
PROTEUM PLUSdata collection
REFMACrefinement
PROTEUM PLUSdata scaling
MrBUMPphasing
PROTEUM PLUSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-03-20
    Type: Initial release
  • Version 1.1: 2019-06-05
    Type: Data collection, Database references