2AE0

Crystal structure of MltA from Escherichia coli reveals a unique lytic transglycosylase fold


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.203 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Crystal Structure of MltA from Escherichia coli Reveals a Unique Lytic Transglycosylase Fold

van Straaten, K.E.Dijkstra, B.W.Vollmer, W.Thunnissen, A.M.W.H.

(2005) J.Mol.Biol. 352: 1068-1080

  • DOI: 10.1016/j.jmb.2005.07.067

  • PubMed Abstract: 
  • Lytic transglycosylases are bacterial enzymes involved in the maintenance and growth of the bacterial cell-wall peptidoglycan. They cleave the beta-(1,4)-glycosidic bonds in peptidoglycan forming non-reducing 1,6-anhydromuropeptides. The crystal stru ...

    Lytic transglycosylases are bacterial enzymes involved in the maintenance and growth of the bacterial cell-wall peptidoglycan. They cleave the beta-(1,4)-glycosidic bonds in peptidoglycan forming non-reducing 1,6-anhydromuropeptides. The crystal structure of the lytic transglycosylase MltA from Escherichia coli without a membrane anchor was solved at 2.0A resolution. The enzyme has a fold completely different from those of the other known lytic transglycosylases. It contains two domains, the largest of which has a double-psi beta-barrel fold, similar to that of endoglucanase V from Humicola insolens. The smaller domain also has a beta-barrel fold topology, which is weakly related to that of the RNA-binding domain of ribosomal proteins L25 and TL5. A large groove separates the two domains, which can accommodate a glycan strand, as shown by molecular modelling. Several conserved residues, one of which is in a position equivalent to that of the catalytic acid of the H.insolens endoglucanase, flank this putative substrate-binding groove. Mutation of this residue, Asp308, abolished all activity of the enzyme, supporting the direct participation of this residue in catalysis.


    Organizational Affiliation

    Laboratory of Biophysical Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Membrane-bound lytic murein transglycosylase A
X
345Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: mltA (mlt, ygdM)
EC: 4.2.2.n1
Find proteins for P0A935 (Escherichia coli (strain K12))
Go to UniProtKB:  P0A935
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
EDO
Query on EDO

Download SDF File 
Download CCD File 
X
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
ACY
Query on ACY

Download SDF File 
Download CCD File 
X
ACETIC ACID
C2 H4 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.203 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 103.873α = 90.00
b = 103.873β = 90.00
c = 109.777γ = 120.00
Software Package:
Software NamePurpose
DENZOdata reduction
PDB_EXTRACTdata extraction
REFMACrefinement
SOLVEphasing
SnBphasing
SCALEPACKdata scaling
RESOLVEphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-10-04
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Advisory, Version format compliance
  • Version 1.3: 2017-10-11
    Type: Refinement description