9G4O | pdb_00009g4o

The strucuture of Streptococcus pyogenes GacA in complex with a fragment


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.55 Å
  • R-Value Free: 
    0.228 (Depositor), 0.228 (DCC) 
  • R-Value Work: 
    0.182 (Depositor), 0.182 (DCC) 
  • R-Value Observed: 
    0.184 (Depositor) 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history


Literature

Cell wall target fragment discovery using a low-cost, minimal fragment library.

Yan, K.Stanley, M.Raimi, O.Ferenbach, A.T.Dorfmueller, H.C.van Aalten, D.M.F.

(2026) FEBS Lett 

  • DOI: https://doi.org/10.1002/1873-3468.70281
  • Primary Citation of Related Structures:  
    9FZT, 9G07, 9G45, 9G46, 9G47, 9G4H, 9G4K, 9G4O, 9G53, 9G5A, 9G5F, 9G5O, 9G5Y, 9G63, 9SWY

  • PubMed Abstract: 

    Fragment-based inhibitor design is an established and widely used approach in drug discovery pipelines. Despite several examples of drugs originating from this approach, the identification of fragments still suffers from issues with solubility, reactivity, cost and worldwide accessibility. Here, we design a low-cost minimal fragment library (LoCoFrag100) for crystallographic screening, with an average cLogP of 0.03 (median 0.23) and an average of £20/g for each compound, facilitating assembly in any laboratory. Formatted in a 10 × 10 matrix to minimize Tanimoto similarity in the 20 cocktails, we demonstrate its applicability on three structurally distinct enzymes involved in microbial cell wall synthesis. Hit rates range from 1 to 6% among these enzymes, with three fragments suggesting avenues for inhibitor exploration. Impact Statement LoCoFrag100 is a low-cost, easily accessible fragment library that enables rapid survey of target ligandability in any laboratory, providing evidence to prioritise targets for follow-up research.


  • Organizational Affiliation
    • Division of Molecular, Cell and Developmental Biology, School of Life Sciences, University of Dundee, UK.

Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
dTDP-4-dehydrorhamnose reductase289Streptococcus pyogenesMutation(s): 0 
Gene Names: rmlDSPy_0784
EC: 1.1.1.133
UniProt
Find proteins for Q9A0G6 (Streptococcus pyogenes serotype M1)
Explore Q9A0G6 
Go to UniProtKB:  Q9A0G6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9A0G6
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.55 Å
  • R-Value Free:  0.228 (Depositor), 0.228 (DCC) 
  • R-Value Work:  0.182 (Depositor), 0.182 (DCC) 
  • R-Value Observed: 0.184 (Depositor) 
Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 36.155α = 113.3
b = 45.702β = 99.54
c = 48.44γ = 95.01
Software Package:
Software NamePurpose
PHENIXrefinement
autoPROCdata reduction
Aimlessdata scaling
MOLREPphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Wellcome TrustUnited Kingdom225350/Z/22/Z
Medical Research Council (MRC, United Kingdom)United KingdomMR/V001094/1

Revision History  (Full details and data files)

  • Version 1.0: 2025-07-30
    Type: Initial release
  • Version 1.1: 2026-01-28
    Changes: Database references