4TXE

ScCTS1 in complex with compound 5

• PDB DOI: https://doi.org/10.2210/pdb4TXE/pdb

• Classification: HYDROLASE
• Organism(s): Saccharomyces cerevisiae
• Expression System: Komagataella pastoris
• Mutation(s): No 


• Deposited: 2014-07-03 Released: 2014-08-06 
• Deposition Author(s): Schuettelkopf, A.W., van Aalten, D.M.F.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 0.191 
• R-Value Work: 0.161 
• R-Value Observed: 0.162 

Literature

Screening-based discovery of Aspergillus fumigatus plant-type chitinase inhibitors

Lockhart, D.E., Schuettelkopf, A.W., Blair, D.E., van Aalten, D.M.F.

(2014) FEBS Lett 588: 3282

• PubMed: 25063338 
• DOI: https://doi.org/10.1016/j.febslet.2014.07.015
• Primary Citation of Related Structures:  
  4TX6, 4TXE


• PubMed Abstract: 
  

  A limited therapeutic arsenal against increasing clinical disease due to Aspergillus spp. necessitates urgent characterisation of new antifungal targets. Here we describe the discovery of novel, low micromolar chemical inhibitors of Aspergillus fumigatus family 18 plant-type chitinase A1 (AfChiA1) by high-throughput screening (HTS). Analysis of the binding mode by X-ray crystallography confirmed competitive inhibition and kinetic studies revealed two compounds with selectivity towards fungal plant-type chitinases. These inhibitors provide new chemical tools to probe the effects of chitinase inhibition on A. fumigatus growth and virulence, presenting attractive starting points for the development of further potent drug-like molecules.

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Organizational Affiliation: 

Division of Molecular Microbiology, College of Life Sciences, University of Dundee, Dundee DD1 5EH, United Kingdom.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 31.84 kDa 
• Atom Count: 2,421 
• Modelled Residue Count: 288 
• Deposited Residue Count: 294 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Endochitinase	A	294	Saccharomyces cerevisiae	Mutation(s): 0  Gene Names: CTS1, SCW2, YLR286C, L8003.13 EC: 3.2.1.14
UniProt
Find proteins for P29029 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c)) Explore P29029  Go to UniProtKB:  P29029

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
38F	B [auth A]	(2S)-1-(2,3-dihydro-1H-inden-2-ylamino)-3-(3,4-dimethylphenoxy)propan-2-ol C20 H25 N O2 ZDNVKJORSKCXID-IBGZPJMESA-N

Binding Affinity Annotations
ID	Source	Binding Affinity
38F	Binding MOAD:  4TXE	IC50: 2400 (nM) from 1 assay(s)

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 0.191 
• R-Value Work: 0.161 
• R-Value Observed: 0.162 
• Space Group: P 2₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 72.773	α = 90
b = 112.159	β = 90
c = 37.164	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement

Structure Validation

Entry History 

Deposition Data

• Released Date: 2014-08-06 
Deposition Author(s): Schuettelkopf, A.W., van Aalten, D.M.F.

Revision History  

• Version 1.0: 2014-08-06
  Type: Initial release
  
• Version 1.1: 2023-12-20
  Changes: Data collection, Database references, Refinement description