7WPJ

Methionyl-tRNA synthetase from Staphylococcus aureus


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.65 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.220 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Fragment screening and structural analyses highlight the ATP-assisted ligand binding for inhibitor discovery against type 1 methionyl-tRNA synthetase.

Yi, J.Cai, Z.Qiu, H.Lu, F.Luo, Z.Chen, B.Gu, Q.Xu, J.Zhou, H.

(2022) Nucleic Acids Res 50: 4755-4768

  • DOI: https://doi.org/10.1093/nar/gkac285
  • Primary Citation of Related Structures:  
    7WPI, 7WPJ, 7WPK, 7WPL, 7WPM, 7WPN, 7WPT, 7WPX, 7WQ0

  • PubMed Abstract: 

    Methionyl-tRNA synthetase (MetRS) charges tRNAMet with l-methionine (L-Met) to decode the ATG codon for protein translation, making it indispensable for all cellular lives. Many gram-positive bacteria use a type 1 MetRS (MetRS1), which is considered a promising antimicrobial drug target due to its low sequence identity with human cytosolic MetRS (HcMetRS, which belongs to MetRS2). Here, we report crystal structures of a representative MetRS1 from Staphylococcus aureus (SaMetRS) in its apo and substrate-binding forms. The connecting peptide (CP) domain of SaMetRS differs from HcMetRS in structural organization and dynamic movement. We screened 1049 chemical fragments against SaMetRS preincubated with or without substrate ATP, and ten hits were identified. Four cocrystal structures revealed that the fragments bound to either the L-Met binding site or an auxiliary pocket near the tRNA CCA end binding site of SaMetRS. Interestingly, fragment binding was enhanced by ATP in most cases, suggesting a potential ATP-assisted ligand binding mechanism in MetRS1. Moreover, co-binding with ATP was also observed in our cocrystal structure of SaMetRS with a class of newly reported inhibitors that simultaneously occupied the auxiliary pocket, tRNA site and L-Met site. Our findings will inspire the development of new MetRS1 inhibitors for fighting microbial infections.


  • Organizational Affiliation

    Guangdong Provincial Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Methionine--tRNA ligase530Staphylococcus aureusMutation(s): 0 
Gene Names: metG
EC: 6.1.1.10
UniProt
Find proteins for Q5HII6 (Staphylococcus aureus (strain COL))
Explore Q5HII6 
Go to UniProtKB:  Q5HII6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5HII6
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.65 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.220 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 59.728α = 90
b = 68.987β = 90
c = 117.404γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
SCALAdata scaling
PDB_EXTRACTdata extraction
CrysalisProdata reduction
MOLREPphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China22177140
National Natural Science Foundation of China (NSFC)China81773636

Revision History  (Full details and data files)

  • Version 1.0: 2022-04-27
    Type: Initial release
  • Version 1.1: 2022-05-18
    Changes: Database references
  • Version 1.2: 2022-11-23
    Changes: Database references
  • Version 1.3: 2023-11-29
    Changes: Data collection, Refinement description