5C1E

Crystal Structure of the Pectin Methylesterase from Aspergillus niger in Penultimately Deglycosylated Form (N-acetylglucosamine Stub at Asn84)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.171 
  • R-Value Observed: 0.172 

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This is version 1.4 of the entry. See complete history


Literature

Structure and Properties of a Non-processive, Salt-requiring, and Acidophilic Pectin Methylesterase from Aspergillus niger Provide Insights into the Key Determinants of Processivity Control.

Kent, L.M.Loo, T.S.Melton, L.D.Mercadante, D.Williams, M.A.Jameson, G.B.

(2016) J Biol Chem 291: 1289-1306

  • DOI: 10.1074/jbc.M115.673152
  • Primary Citation of Related Structures:  
    5C1C, 5C1E

  • PubMed Abstract: 
  • Many pectin methylesterases (PMEs) are expressed in plants to modify plant cell-wall pectins for various physiological roles. These pectins are also attacked by PMEs from phytopathogens and phytophagous insects. The de-methylesterification by PMEs of the O6-methyl ester groups of the homogalacturonan component of pectin, exposing galacturonic acids, can occur processively or non-processively, respectively, describing sequential versus single de-methylesterification events occurring before enzyme-substrate dissociation ...

    Many pectin methylesterases (PMEs) are expressed in plants to modify plant cell-wall pectins for various physiological roles. These pectins are also attacked by PMEs from phytopathogens and phytophagous insects. The de-methylesterification by PMEs of the O6-methyl ester groups of the homogalacturonan component of pectin, exposing galacturonic acids, can occur processively or non-processively, respectively, describing sequential versus single de-methylesterification events occurring before enzyme-substrate dissociation. The high resolution x-ray structures of a PME from Aspergillus niger in deglycosylated and Asn-linked N-acetylglucosamine-stub forms reveal a 10⅔-turn parallel β-helix (similar to but with less extensive loops than bacterial, plant, and insect PMEs). Capillary electrophoresis shows that this PME is non-processive, halophilic, and acidophilic. Molecular dynamics simulations and electrostatic potential calculations reveal very different behavior and properties compared with processive PMEs. Specifically, uncorrelated rotations are observed about the glycosidic bonds of a partially de-methyl-esterified decasaccharide model substrate, in sharp contrast to the correlated rotations of processive PMEs, and the substrate-binding groove is negatively not positively charged.


    Related Citations: 
    • Processive pectin methylesterases: the role of electrostatic potential, breathing motions and bond cleavage in the rectification of Brownian motions
      Mercadante, D., Melton, L.D., Jameson, G.B., Williams, M.A.K.
      (2014) PLoS One 9: e87581
    • Substrate Dynamics in Enzyme Action: Rotations of Monosaccharide Subunits in the Binding Groove are Essential for Pectin Methylesterase Processivity
      Mercadante, D., Melton, L.D., Jameson, G.B., Williams, M.A.K., De Simone, A.
      (2013) Biophys J 104: 1731

    Organizational Affiliation

    From Riddet Institute and Institute of Fundamental Sciences, Massey University, Palmerston North 4442, New Zealand, MacDiarmid Institute for Advanced Materials and Nanotechnology, Palmerston North 4442, New Zealand g.b.jameson@massey.ac.nz.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PectinesteraseA299Aspergillus niger ATCC 1015Mutation(s): 0 
Gene Names: ASPNIDRAFT_214857
EC: 3.1.1.11
UniProt
Find proteins for G3YAL0 (Aspergillus niger (strain ATCC 1015 / CBS 113.46 / FGSC A1144 / LSHB Ac4 / NCTC 3858a / NRRL 328 / USDA 3528.7))
Explore G3YAL0 
Go to UniProtKB:  G3YAL0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupG3YAL0
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG

Download Ideal Coordinates CCD File 
B [auth A]2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
SO4
Query on SO4

Download Ideal Coordinates CCD File 
C [auth A],
D [auth A],
E [auth A],
F [auth A],
G [auth A]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
GOL
Query on GOL

Download Ideal Coordinates CCD File 
I [auth A],
J [auth A],
K [auth A],
L [auth A],
N [auth A]
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
ACT
Query on ACT

Download Ideal Coordinates CCD File 
M [auth A]ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
CL
Query on CL

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.171 
  • R-Value Observed: 0.172 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.614α = 90
b = 113.543β = 90
c = 88.765γ = 90
Software Package:
Software NamePurpose
d*TREKdata scaling
REFMACrefinement
PDB_EXTRACTdata extraction
CrystalCleardata reduction
MrBUMPphasing

Structure Validation

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Ligand Structure Quality Assessment 



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-07-01
    Type: Initial release
  • Version 1.1: 2015-12-02
    Changes: Database references
  • Version 1.2: 2016-02-03
    Changes: Database references
  • Version 1.3: 2017-11-01
    Changes: Author supporting evidence, Database references, Derived calculations, Refinement description
  • Version 1.4: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Structure summary