5D1W

Crystal structure of Mycobacterium tuberculosis Rv3249c transcriptional regulator.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.59 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.177 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural Basis for the Regulation of the MmpL Transporters of Mycobacterium tuberculosis.

Delmar, J.A.Chou, T.H.Wright, C.C.Licon, M.H.Doh, J.K.Radhakrishnan, A.Kumar, N.Lei, H.T.Bolla, J.R.Rajashankar, K.R.Su, C.C.Purdy, G.E.Yu, E.W.

(2015) J.Biol.Chem. 290: 28559-28574

  • DOI: 10.1074/jbc.M115.683797
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The mycobacterial cell wall is critical to the virulence of these pathogens. Recent work shows that the MmpL (mycobacterial membrane protein large) family of transporters contributes to cell wall biosynthesis by exporting fatty acids and lipidic elem ...

    The mycobacterial cell wall is critical to the virulence of these pathogens. Recent work shows that the MmpL (mycobacterial membrane protein large) family of transporters contributes to cell wall biosynthesis by exporting fatty acids and lipidic elements of the cell wall. The expression of the Mycobacterium tuberculosis MmpL proteins is controlled by a complex regulatory network, including the TetR family transcriptional regulators Rv3249c and Rv1816. Here we report the crystal structures of these two regulators, revealing dimeric, two-domain molecules with architecture consistent with the TetR family of regulators. Buried extensively within the C-terminal regulatory domains of Rv3249c and Rv1816, we found fortuitous bound ligands, which were identified as palmitic acid (a fatty acid) and isopropyl laurate (a fatty acid ester), respectively. Our results suggest that fatty acids may be the natural ligands of these regulatory proteins. Using fluorescence polarization and electrophoretic mobility shift assays, we demonstrate the recognition of promoter and intragenic regions of multiple mmpL genes by these proteins. Binding of palmitic acid renders these regulators incapable of interacting with their respective operator DNAs, which will result in derepression of the corresponding mmpL genes. Taken together, these experiments provide new perspectives on the regulation of the MmpL family of transporters.


    Organizational Affiliation

    From the Departments of Physics and Astronomy and.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Rv3249c transcriptional regulator
A, B, C, D, E, F
217Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)Mutation(s): 0 
Find proteins for O05892 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Go to UniProtKB:  O05892
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PLM
Query on PLM

Download SDF File 
Download CCD File 
A, B, C, D
PALMITIC ACID
C16 H32 O2
IPCSVZSSVZVIGE-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.59 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.177 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 234.048α = 90.00
b = 75.493β = 121.55
c = 125.361γ = 90.00
Software Package:
Software NamePurpose
Cootmodel building
REFMACrefinement
PDB_EXTRACTdata extraction
SCALEPACKdata scaling
SHELXphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-09-30
    Type: Initial release
  • Version 1.1: 2015-10-07
    Type: Database references
  • Version 1.2: 2015-12-02
    Type: Database references
  • Version 1.3: 2017-11-22
    Type: Database references, Derived calculations, Refinement description