C-terminal truncated KsgA from Bacillus subtilis 168

Experimental Data Snapshot

  • Resolution: 3.11 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.197 

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This is version 1.2 of the entry. See complete history


Deciphering Determinants in Ribosomal Methyltransferases That Confer Antimicrobial Resistance.

Bhujbalrao, R.Anand, R.

(2019) J Am Chem Soc 141: 1425-1429

  • DOI: https://doi.org/10.1021/jacs.8b10277
  • Primary Citation of Related Structures:  
    6IFS, 6IFT, 6IFV, 6IFW, 6IFX

  • PubMed Abstract: 

    Post-translational methylation of rRNA at select positions is a prevalent resistance mechanism adopted by pathogens. In this work, KsgA, a housekeeping ribosomal methyltransferase (rMtase) involved in ribosome biogenesis, was exploited as a model system to delineate the specific targeting determinants that impart substrate specificity to rMtases. With a combination of evolutionary and structure-guided approaches, a set of chimeras were created that altered the targeting specificity of KsgA such that it acted similarly to erythromycin-resistant methyltransferases (Erms), rMtases found in multidrug-resistant pathogens. The results revealed that specific loop embellishments on the basic Rossmann fold are key determinants in the selection of the cognate RNA. Moreover, in vivo studies confirmed that chimeric constructs are competent in imparting macrolide resistance. This work explores the factors that govern the emergence of resistance and paves the way for the design of specific inhibitors useful in reversing antibiotic resistance.

  • Organizational Affiliation

    Department of Chemistry , Indian Institute of Technology Bombay , Powai, Mumbai 400076 , India.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ribosomal RNA small subunit methyltransferase A
A, B
215Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: rsmAksgABSU00420
Find proteins for P37468 (Bacillus subtilis (strain 168))
Explore P37468 
Go to UniProtKB:  P37468
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP37468
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.11 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.197 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 77.867α = 90
b = 77.867β = 90
c = 143.638γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Other governmentIndia20150237B02RP00614-BRNS

Revision History  (Full details and data files)

  • Version 1.0: 2019-01-30
    Type: Initial release
  • Version 1.1: 2019-02-13
    Changes: Data collection, Database references
  • Version 1.2: 2024-03-27
    Changes: Data collection, Database references, Refinement description