5OHU

The X-ray Structure of Lytic Transglycosylase Slt from Pseudomonas aeruginosa


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.184 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Exolytic and endolytic turnover of peptidoglycan by lytic transglycosylase Slt ofPseudomonas aeruginosa.

Lee, M.Batuecas, M.T.Tomoshige, S.Dominguez-Gil, T.Mahasenan, K.V.Dik, D.A.Hesek, D.Millan, C.Uson, I.Lastochkin, E.Hermoso, J.A.Mobashery, S.

(2018) Proc Natl Acad Sci U S A 115: 4393-4398

  • DOI: 10.1073/pnas.1801298115
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • β-Lactam antibiotics inhibit cell-wall transpeptidases, preventing the peptidoglycan, the major constituent of the bacterial cell wall, from cross-linking. This causes accumulation of long non-cross-linked strands of peptidoglycan, which leads to bac ...

    β-Lactam antibiotics inhibit cell-wall transpeptidases, preventing the peptidoglycan, the major constituent of the bacterial cell wall, from cross-linking. This causes accumulation of long non-cross-linked strands of peptidoglycan, which leads to bacterial death. Pseudomonas aeruginosa , a nefarious bacterial pathogen, attempts to repair this aberrantly formed peptidoglycan by the function of the lytic transglycosylase Slt. We document in this report that Slt turns over the peptidoglycan by both exolytic and endolytic reactions, which cause glycosidic bond scission from a terminus or in the middle of the peptidoglycan, respectively. These reactions were characterized with complex synthetic peptidoglycan fragments that ranged in size from tetrasaccharides to octasaccharides. The X-ray structure of the wild-type apo Slt revealed it to be a doughnut-shaped protein. In a series of six additional X-ray crystal structures, we provide insights with authentic substrates into how Slt is enabled for catalysis for both the endolytic and exolytic reactions. The substrate for the exolytic reaction binds Slt in a canonical arrangement and reveals how both the glycan chain and the peptide stems are recognized by the Slt. We document that the apo enzyme does not have a fully formed active site for the endolytic reaction. However, binding of the peptidoglycan at the existing subsites within the catalytic domain causes a conformational change in the protein that assembles the surface for binding of a more expansive peptidoglycan between the catalytic domain and an adjacent domain. The complexes of Slt with synthetic peptidoglycan substrates provide an unprecedented snapshot of the endolytic reaction.


    Organizational Affiliation

    Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556; xjuan@iqfr.csic.es mobashery@nd.edu.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Soluble lytic murein transglycosylase
A
642Pseudomonas aeruginosaMutation(s): 0 
Gene Names: sltAOY09_04369PAMH19_2049E4V10_02545IPC1481_13125IPC1509_14880
EC: 4.2.2
Find proteins for A0A069QJX4 (Pseudomonas aeruginosa)
Go to UniProtKB:  A0A069QJX4
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

Download CCD File 
A
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.184 
  • Space Group: P 63
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 163.981α = 90
b = 163.981β = 90
c = 56.706γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2018-04-18
    Type: Initial release
  • Version 1.1: 2018-05-02
    Changes: Data collection, Database references