5SV8

Crystal Structure of the catalytic nucleophile and surface cysteine mutant of VvEG16 in complex with a xyloglucan oligosaccharide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.588 Å
  • R-Value Free: 0.179 
  • R-Value Work: 0.152 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystallographic insight into the evolutionary origins of xyloglucan endotransglycosylases and endohydrolases.

McGregor, N.Yin, V.Tung, C.C.Van Petegem, F.Brumer, H.

(2017) Plant J. 89: 651-670

  • DOI: 10.1111/tpj.13421
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The xyloglucan endotransglycosylase/hydrolase (XTH) gene family encodes enzymes of central importance to plant cell wall remodeling. The evolutionary history of plant XTH gene products is incompletely understood vis-à-vis the larger body of bacterial ...

    The xyloglucan endotransglycosylase/hydrolase (XTH) gene family encodes enzymes of central importance to plant cell wall remodeling. The evolutionary history of plant XTH gene products is incompletely understood vis-à-vis the larger body of bacterial endoglycanases in Glycoside Hydrolase Family 16 (GH16). To provide molecular insight into this issue, high-resolution X-ray crystal structures and detailed enzyme kinetics of an extant transitional plant endoglucanase (EG) were determined. Functionally intermediate between plant XTH gene products and bacterial licheninases of GH16, Vitis vinifera EG16 (VvEG16) effectively catalyzes the hydrolysis of the backbones of two dominant plant cell wall matrix glycans, xyloglucan (XyG) and β(1,3)/β(1,4)-mixed-linkage glucan (MLG). Crystallographic complexes with extended oligosaccharide substrates reveal the structural basis for the accommodation of both unbranched, mixed-linked (MLG) and highly decorated, linear (XyG) polysaccharide chains in a broad, extended active-site cleft. Structural comparison with representative bacterial licheninases, a xyloglucan endotranglycosylase (XET), and a xyloglucan endohydrolase (XEH) outline the functional ramifications of key sequence deletions and insertions across the phylogenetic landscape of GH16. Although the biological role(s) of EG16 orthologs remains to be fully resolved, the present biochemical and tertiary structural characterization provides key insight into plant cell wall enzyme evolution, which will continue to inform genomic analyses and functional studies across species.


    Organizational Affiliation

    Michael Smith Laboratories, University of British Columbia, 2185 East Mall, Vancouver, BC, V6T 1Z4, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
probable xyloglucan endotransglucosylase/hydrolase protein 19
A
208Vitis viniferaMutation(s): 2 
Find proteins for F6I323 (Vitis vinifera)
Go to UniProtKB:  F6I323
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BGC
Query on BGC

Download SDF File 
Download CCD File 
A
BETA-D-GLUCOSE
C6 H12 O6
WQZGKKKJIJFFOK-VFUOTHLCSA-N
 Ligand Interaction
XYS
Query on XYS

Download SDF File 
Download CCD File 
A
XYLOPYRANOSE
C5 H10 O5
SRBFZHDQGSBBOR-LECHCGJUSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.588 Å
  • R-Value Free: 0.179 
  • R-Value Work: 0.152 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 46.249α = 90.00
b = 51.867β = 90.00
c = 82.609γ = 90.00
Software Package:
Software NamePurpose
Blu-Icedata collection
XDSdata scaling
REFMACrefinement
XSCALEdata scaling
PDB_EXTRACTdata extraction
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Natural Sciences and Engineering Research Council (Canada)Canada--

Revision History 

  • Version 1.0: 2016-09-21
    Type: Initial release
  • Version 1.1: 2017-09-20
    Type: Author supporting evidence, Derived calculations, Refinement description
  • Version 1.2: 2017-11-01
    Type: Database references