5EOV

C-terminal domain of the 16S/23S rRNA (cytidine-2'-O)-methyltransferase TlyA.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.701 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.188 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

A Novel Motif for S-Adenosyl-l-methionine Binding by the Ribosomal RNA Methyltransferase TlyA from Mycobacterium tuberculosis.

Witek, M.A.Kuiper, E.G.Minten, E.Crispell, E.K.Conn, G.L.

(2017) J. Biol. Chem. 292: 1977-1987

  • DOI: 10.1074/jbc.M116.752659
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Capreomycin is a potent ribosome-targeting antibiotic that is an essential component of current antituberculosis treatments, particularly in the case of multidrug-resistant Mycobacterium tuberculosis (Mtb). Optimal capreomycin binding and Mtb ribosom ...

    Capreomycin is a potent ribosome-targeting antibiotic that is an essential component of current antituberculosis treatments, particularly in the case of multidrug-resistant Mycobacterium tuberculosis (Mtb). Optimal capreomycin binding and Mtb ribosome inhibition requires ribosomal RNA methylation in both ribosome subunits by TlyA (Rv1694), an enzyme with dual 2'-O-methytransferase and putative hemolytic activities. Despite the important role of TlyA in capreomycin sensitivity and identification of inactivating mutations in the corresponding Mtb gene tlyA, which cause resistance to capreomycin, our current structural and mechanistic understanding of TlyA action remains limited. Here, we present structural and functional analyses of Mtb TlyA interaction with its obligatory co-substrate for methyltransferase activity, S-adenosyl-l-methionine (SAM). Despite adopting a complete class I methyltransferase fold containing conserved SAM-binding and catalytic motifs, the isolated TlyA carboxyl-terminal domain exhibits no detectable affinity for SAM. Further analyses identify a tetrapeptide motif (RXWV) in the TlyA interdomain linker as indispensable for co-substrate binding. Our results also suggest that structural plasticity of the RXWV motif could contribute to TlyA domain interactions, as well as specific recognition of its two structurally distinct ribosomal RNA targets. Our findings thus reveal a novel motif requirement for SAM binding by TlyA and set the stage for future mechanistic studies of TlyA substrate recognition and modification that underpin Mtb sensitivity to capreomycin.


    Organizational Affiliation

    From the Department of Biochemistry.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
16S/23S rRNA (cytidine-2'-O)-methyltransferase TlyA
A
220Mycobacterium tuberculosis (strain CDC 1551 / Oshkosh)Mutation(s): 0 
Gene Names: tlyA
EC: 2.1.1.226, 2.1.1.227
Find proteins for P9WJ62 (Mycobacterium tuberculosis (strain CDC 1551 / Oshkosh))
Go to UniProtKB:  P9WJ62
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.701 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.188 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 67.783α = 90.00
b = 67.783β = 90.00
c = 80.285γ = 90.00
Software Package:
Software NamePurpose
PHENIXphasing
HKL-2000data reduction
HKL-2000data scaling
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious DiseasesUnited StatesR01 AI088025

Revision History 

  • Version 1.0: 2016-11-23
    Type: Initial release
  • Version 1.1: 2017-01-04
    Type: Database references
  • Version 1.2: 2017-01-11
    Type: Database references
  • Version 1.3: 2017-02-15
    Type: Database references
  • Version 1.4: 2017-09-20
    Type: Author supporting evidence