1UP0

Structure of the endoglucanase Cel6 from Mycobacterium tuberculosis in complex with cellobiose at 1.75 angstrom


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.181 
  • R-Value Work: 0.142 
  • R-Value Observed: 0.144 

wwPDB Validation   3D Report Full Report


This is version 2.0 of the entry. See complete history


Literature

Mycobacterium Tuberculosis Strains Possess Functional Cellulases.

Varrot, A.Leydier, S.Pell, G.Macdonald, J.M.Stick, R.V.Henrissat, B.Gilbert, H.J.Davies, G.J.

(2005) J Biol Chem 280: 20181

  • DOI: 10.1074/jbc.C500142200
  • Primary Citation of Related Structures:  
    1UOZ, 1UP0, 1UP2, 1UP3

  • PubMed Abstract: 
  • The genomes of various Mycobacterium tuberculosis strains encode proteins that do not appear to play a role in the growth or survival of the bacterium in its mammalian host, including some implicated in plant cell wall breakdown. Here we show that M. tuberculosis H37Rv does indeed possess a functional cellulase ...

    The genomes of various Mycobacterium tuberculosis strains encode proteins that do not appear to play a role in the growth or survival of the bacterium in its mammalian host, including some implicated in plant cell wall breakdown. Here we show that M. tuberculosis H37Rv does indeed possess a functional cellulase. The x-ray crystal structure of this enzyme, in ligand complex forms, from 1.9 to 1.1A resolution, reveals a highly conserved substrate-binding cleft, which affords similar, and unusual, distortion of the substrate at the catalytic center. The endoglucanase activity, together with the existence of a putative membrane-associated crystalline polysaccharide-binding protein, may reflect the ancestral soil origin of the Mycobacterium or hint at a previously unconsidered environmental niche.


    Organizational Affiliation

    York Structural Biology Laboratory, Department of Chemistry, University of York, York, Y010 5YW, United Kingdom.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PUTATIVE CELLULASE CEL6A294Mycobacterium tuberculosis H37RvMutation(s): 0 
Gene Names: celA1Rv0062
EC: 3.2.1
UniProt
Find proteins for Q79G13 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore Q79G13 
Go to UniProtKB:  Q79G13
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ79G13
Protein Feature View
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  • Reference Sequence
Oligosaccharides

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Entity ID: 2
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
beta-D-glucopyranose-(1-4)-beta-D-glucopyranoseB 2N/A Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G84824ZO
GlyCosmos:  G84824ZO
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
1PG
Query on 1PG

Download Ideal Coordinates CCD File 
E [auth A]2-(2-{2-[2-(2-METHOXY-ETHOXY)-ETHOXY]-ETHOXY}-ETHOXY)-ETHANOL
C11 H24 O6
SLNYBUIEAMRFSZ-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4

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

Download Ideal Coordinates CCD File 
D [auth A]ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MHO
Query on MHO
A L-PEPTIDE LINKINGC5 H11 N O3 SMET
Biologically Interesting Molecules (External Reference) 1 Unique
Entity ID: 2
IDChainsNameType/Class2D Diagram3D Interactions
PRD_900005
Query on PRD_900005
Bbeta-cellobioseOligosaccharide / Metabolism Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.181 
  • R-Value Work: 0.142 
  • R-Value Observed: 0.144 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 61.605α = 90
b = 93.095β = 90
c = 46.667γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-11-18
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 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