4CN1

GlgE isoform 1 from Streptomyces coelicolor D394A mutant with maltose- 1-phosphate bound


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.55 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.185 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Structural Insight Into How Streptomyces Coelicolor Maltosyl Transferase Glge Binds Alpha-Maltose 1-Phosphate and Forms a Maltosyl-Enzyme Intermediate.

Syson, K.Stevenson, C.E.M.Rashid, A.M.Saalbach, G.Tang, M.Tuukkanen, A.Svergun, D.I.Withers, S.G.Lawson, D.M.Bornemann, S.

(2014) Biochemistry 53: 2494

  • DOI: 10.1021/bi500183c
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • GlgE (EC 2.4.99.16) is an α-maltose 1-phosphate:(1→4)-α-d-glucan 4-α-d-maltosyltransferase of the CAZy glycoside hydrolase 13_3 family. It is the defining enzyme of a bacterial α-glucan biosynthetic pathway and is a genetically validated anti-tubercu ...

    GlgE (EC 2.4.99.16) is an α-maltose 1-phosphate:(1→4)-α-d-glucan 4-α-d-maltosyltransferase of the CAZy glycoside hydrolase 13_3 family. It is the defining enzyme of a bacterial α-glucan biosynthetic pathway and is a genetically validated anti-tuberculosis target. It catalyzes the α-retaining transfer of maltosyl units from α-maltose 1-phosphate to maltooligosaccharides and is predicted to use a double-displacement mechanism. Evidence of this mechanism was obtained using a combination of site-directed mutagenesis of Streptomyces coelicolor GlgE isoform I, substrate analogues, protein crystallography, and mass spectrometry. The X-ray structures of α-maltose 1-phosphate bound to a D394A mutein and a β-2-deoxy-2-fluoromaltosyl-enzyme intermediate with a E423A mutein were determined. There are few examples of CAZy glycoside hydrolase family 13 members that have had their glycosyl-enzyme intermediate structures determined, and none before now have been obtained with a 2-deoxy-2-fluoro substrate analogue. The covalent modification of Asp394 was confirmed using mass spectrometry. A similar modification of wild-type GlgE proteins from S. coelicolor and Mycobacterium tuberculosis was also observed. Small-angle X-ray scattering of the M. tuberculosis enzyme revealed a homodimeric assembly similar to that of the S. coelicolor enzyme but with slightly differently oriented monomers. The deeper understanding of the structure-function relationships of S. coelicolor GlgE will aid the development of inhibitors of the M. tuberculosis enzyme.


    Organizational Affiliation

    Department of Biological Chemistry, John Innes Centre, Norwich Research Park , Norwich NR4 7UH, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ALPHA-1,4-GLUCAN\: MALTOSE-1-PHOSPHATE MALTOSYLTRANSFERASE 1
A, B
695Streptomyces coelicolor (strain ATCC BAA-471 / A3(2) / M145)Mutation(s): 1 
Gene Names: glgE1 (pep1, pep1A, pep1I)
EC: 2.4.99.16
Find proteins for Q9L1K2 (Streptomyces coelicolor (strain ATCC BAA-471 / A3(2) / M145))
Go to UniProtKB:  Q9L1K2
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
M1F
Query on M1F

Download SDF File 
Download CCD File 
A, B
alpha-maltose 1-phosphate
C12 H23 O14 P
VRKQBSISJQUWFI-QUYVBRFLSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.55 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.185 
  • Space Group: P 41 21 2
Unit Cell:
Length (Å)Angle (°)
a = 113.520α = 90.00
b = 113.520β = 90.00
c = 313.600γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
PHASERphasing
Aimlessdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-05-21
    Type: Initial release