1MVY

Amylosucrase mutant E328Q co-crystallized with maltoheptaose.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.181 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Oligosaccharide and Sucrose Complexes of Amylosucrase. STRUCTURAL IMPLICATIONS FOR THE POLYMERASE ACTIVITY

Skov, L.K.Mirza, O.Sprogoe, D.Dar, I.Remaud-Simeon, M.Albenne, C.Monsan, P.Gajhede, M.

(2002) J.BIOL.CHEM. 277: 47741-47747

  • DOI: 10.1074/jbc.M207860200
  • Primary Citation of Related Structures:  1MW0, 1MW1, 1MW2, 1MW3

  • PubMed Abstract: 
  • The glucosyltransferase amylosucrase is structurally quite similar to the hydrolase alpha-amylase. How this switch in functionality is achieved is an important and fundamental question. The inactive E328Q amylosucrase variant has been co-crystallized ...

    The glucosyltransferase amylosucrase is structurally quite similar to the hydrolase alpha-amylase. How this switch in functionality is achieved is an important and fundamental question. The inactive E328Q amylosucrase variant has been co-crystallized with maltoheptaose, and the structure was determined by x-ray crystallography to 2.2 A resolution, revealing a maltoheptaose binding site in the B'-domain somewhat distant from the active site. Additional soaking of these crystals with maltoheptaose resulted in replacement of Tris in the active site with maltoheptaose, allowing the mapping of the -1 to +5 binding subsites. Crystals of amylosucrase were soaked with sucrose at different concentrations. The structures at approximately 2.1 A resolution revealed three new binding sites of different affinity. The highest affinity binding site is close to the active site but is not in the previously identified substrate access channel. Allosteric regulation seems necessary to facilitate access from this binding site. The structures show the pivotal role of the B'-domain in the transferase reaction. Based on these observations, an extension of the hydrolase reaction mechanism valid for this enzyme can be proposed. In this mechanism, the glycogen-like polymer is bound in the widest access channel to the active site. The polymer binding introduces structural changes that allow sucrose to migrate from its binding site into the active site and displace the polymer.


    Related Citations: 
    • Crystal Structure of Amylosucrase from Neisseria Polysaccharea in Complex with D-Glucose and the Active Site Mutant Glu328Gln in Complex with the Natural Substrate Sucrose
      Mirza, O.,Skov, L.K.,Remaud-Simeon, M.,De Montalk, G.P.,Albenne, C.,Monsan, P.,Gajhede, M.
      (2001) Biochemistry 40: 9032
    • Amylosucrase, a Glucan-Synthesizing Enzyme from the Alpha-Amylase Family
      Skov, L.K.,Mirza, O.,Henriksen, A.,De Montalk, G.P.,Remaud-Simeon, M.,Sarcabal, P.,Willemot, R.M.,Monsan, P.,Gajhede, M.
      (2001) J.Biol.Chem. 276: 25273


    Organizational Affiliation

    Protein Structure Group, Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark. lsk@dfh.dk




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
amylosucrase
A
628Neisseria polysacchareaGene Names: ams
EC: 2.4.1.4
Find proteins for Q9ZEU2 (Neisseria polysaccharea)
Go to UniProtKB:  Q9ZEU2
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GLC
Query on GLC

Download SDF File 
Download CCD File 
A
ALPHA-D-GLUCOSE
C6 H12 O6
WQZGKKKJIJFFOK-DVKNGEFBSA-N
 Ligand Interaction
TRS
Query on TRS

Download SDF File 
Download CCD File 
A
2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL
TRIS BUFFER
C4 H12 N O3
LENZDBCJOHFCAS-UHFFFAOYSA-O
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.181 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 96.028α = 90.00
b = 116.358β = 90.00
c = 60.303γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
CNSphasing
CNSrefinement
MAR345data collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-12-18
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-11
    Type: Data collection, Refinement description